Journal of Manipulative and Physiological Therapeutics
Volume 30, Issue 9 , Pages 684-717, November 2007

Diagnostic Imaging Practice Guidelines for Musculoskeletal Complaints in Adults—An Evidence-Based Approach:

Part 1: Lower Extremity Disorders

  • André E. Bussières, DC

      Affiliations

    • Professor, Chiropractic Department, Université du Québec à Trois-Rivières
    • Corresponding Author InformationSubmit requests for reprints to: Bussières, André, département chiropratique, Université du Québec à Trois-Rivières, C.P. 500, Trois-Rivières, Québec, Canada G9A 5H7.
  • ,
  • John A.M. Taylor, DC

      Affiliations

    • Professor of Radiology, New York Chiropractic College; Adjunct Professor, D'Youville College, Buffalo, New York
  • ,
  • Cynthia Peterson, DC, RN, MMedEd

      Affiliations

    • Professor, Canadian Memorial Chiropractic College

Received 15 July 2007; received in revised form 12 September 2007; accepted 14 October 2007.

Article Outline

Abstract 

Purpose

The aim of this study was to develop evidence-based diagnostic imaging practice guidelines to assist chiropractors and other primary care providers in decision making for the appropriate use of diagnostic imaging of lower extremity disorders.

Methods

A comprehensive search of the English and French language literature was conducted using a combination of subject headings and keywords. The quality of the citations was assessed using the Quality of Diagnostic Accuracy Studies (QUADAS), the Appraisal of Guidelines Research and Evaluation (AGREE), and the Stroke Prevention and Educational Awareness Diffusion (SPREAD) evaluation tools. The Referral Guidelines for Imaging (Radiation Protection 118) coordinated by the European Commission served as the initial template. The first draft was sent for external review. A Delphi panel composed of international experts on the topic of musculoskeletal disorders in chiropractic radiology, clinical sciences, and research were invited to review and propose recommendations on the indications for diagnostic imaging. The guidelines were pilot tested and peer reviewed by field chiropractors, and by chiropractic and medical specialists. Recommendations were graded according to the strength of the evidence.

Results

Recommendations for diagnostic imaging guidelines of adult lower extremity disorders are provided, supported by more than 174 primary and secondary citations. Except for trauma, the overall quality of available literature is low. On average, 57 Delphi panelists completed 1 of 2 rounds, reaching more than 83% agreement on all 56 recommendations. Peer review by specialists reflected high levels of agreement, perceived ease of use of guidelines, and implementation feasibility.

Conclusions

The guidelines are intended to be used in conjunction with sound clinical judgment and experience and should be updated regularly. Dissemination and implementation strategies are discussed. Future research is needed to validate their content.

Key Indexing Terms: Practice Guideline, Guideline, Diagnostic Imaging, Radiology, Diagnostic X-ray, Radiography, Adult, Musculoskeletal System, Pain, Lower Extremity, Hip, Knee, Ankle, Foot, Trauma

 

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Reporting of Topics Included in the Development of the Diagnostic Imaging Practice Guidelines1 

An initial literature review considered 10 clinical questions pertaining to imaging of musculoskeletal conditions to evaluate the pertinence of developing diagnostic imaging guidelines. This initial review led to a research project divided into 9 phases: (1) literature search, (2) independent literature assessment, (3) guideline development specific recommendations, (4) first external review, (5) consensus panel (modified Delphi), (6) public Web site, (7) second external review, (8) final draft and grading of the recommendations, and (9) dissemination and implementation. Details of this study are published elsewhere.2

Focus 

These diagnostic imaging guidelines concern adult musculoskeletal disorders of the lower extremities where conventional radiography and specialized imaging studies are deemed useful for diagnostic purposes.

Objectives 

These proposed guidelines are intended to reduce unnecessary radiation exposure and the use of specialized imaging studies, increase examination precision, and decrease health care costs—all without compromising quality of care. The reasons for developing these guidelines include assisting current and future health care providers to make appropriate use of imaging studies, providing indications for the need of imaging studies according to current literature and expert consensus, and assisting in optimizing the use of limited available resources.

Target Users/Setting 

Intended users of the guidelines are chiropractors and other primary health care providers prescribing diagnostic imaging studies. The setting in which these guidelines may be used include private clinics, outpatient clinics, and hospital emergency departments.

Target Population 

The patient population eligible for guideline recommendations are adult patients presenting with musculoskeletal disorders of the lower extremities. Children and pregnant patients are excluded from these guideline recommendations.

Developers 

The proposed guidelines are developed from the results of 9 distinct phases overseen by a research team composed of the 3 investigators with postgraduate education from 3 independent teaching institutions. The guidelines were further developed and peer reviewed by more than 60 chiropractic clinicians, academics, researchers, and a group of physicians.

Evidence Collection 

Electronic searches in English and French language literature occurred, and cross-references were repeated on 3 different occasions between 2003 and 2006.

Methods for Synthesizing Evidence 


1.Literature search and Independent literature assessment of spinal disorders: Quality of Diagnostic Accuracy Studies (QUADAS),3 Appraisal of Guidelines Research and Evaluation (AGREE),4 and Stroke Prevention and Educational Awareness Diffusion (SPREAD).5

2.Initial draft. Template based on European Commission classification (2001).6

3.Expert consensus. A 2-round modified Delphi process was used to generate consensus among an international panel of more than 60 experts in musculoskeletal disorders.

Recommendation Grading Criteria 

The evaluation tool used was designed by the Scottish Intercollegiate Guidelines Network (SIGN) and adapted by the Stroke Prevention and Educational Awareness Diffusion (SPREAD group).5,7

Patient Preferences: Condition-Specific Imaging Guidelines 

Integral to evidence-based health care, decisions regarding the use of imaging studies should be based on the best available evidence, and the experience and judgment of the clinician, while considering patient preference. A public member reviewed all documents and provided comments and suggestions.

Stakeholders and Editorial Independence 

Pre-release Review 

Before the release of the guidelines, the reliability of proposed recommendations was tested on specialists both in chiropractic and in medicine as well as on field chiropractors.

Potential Conflict of Interest 

The research team involved in the development of these guidelines declares no existing or potential conflict of interest. No investigators have received, nor will receive, any personal financial benefits or derive any salary from this project.

Funding Sources/Sponsors 


1.Canadian Memorial Chiropractic College Post Graduate Education and Research (2005)

2.National Institutes of Health student grant (2006)

3.Canadian Chiropractic Protective Association (2006)

Updating/Revision 

The literature review and the guidelines should be updated every 2 to 3 years.

Potential Benefits and Harm 

These include selection of appropriate radiologic imaging procedures for evaluation of patients with musculoskeletal disorders of the lower extremities; and decreased unnecessary ionizing radiation exposure, decreased costs, and improved accessibility.

Dissemination/Implementation Considerations 

Means of dissemination include publication; application to the National Guideline Clearinghouse; posting of the electronic document on various Web sites (malpractice insurance carriers, outpatient teaching clinics); educational intervention strategies (e-learning, community pilot studies); referral guidelines, reinforced by request checking and clinical management algorithms; promotion by national, provincial, and state organizations; and conferences.

Definitions, Patient Presentations, Recommendations, and Rationale 

These topics are integral parts of each one of the three diagnostic imaging guidelines: lower extremity disorders, upper extremity disorders, and spine disorders. Results of the 9 phases of the research project are published elsewhere in this issue of the journal.2

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Preliminary Considerations and Disclaimer 

What is the Role of These Guidelines? 

These evidence-based diagnostic imaging practice guidelines are intended to assist primary care providers and students in decision making regarding the appropriate use of diagnostic imaging for specific clinical presentations. The guidelines are intended to be used in conjunction with sound clinical judgment and experience. For example, other special circumstances for radiographic imaging studies may include: patient unable to give a reliable history, crippling cancer phobia focused on back pain, need for immediate decision about career or athletic future or legal evaluation, history of significant radiographic abnormalities elsewhere reported to patient but no films or reliable report reasonably available, and history of finding from other study (eg, nuclear medicine or imaging of the pelvis) that requires radiograph for correlation.8 Application of these guidelines should help avoid unnecessary radiographs, increase examination precision, and decrease health care costs without compromising the quality of care.

The descriptions of clinical presentations and proposed clinical diagnostic criteria, the recommendations for imaging studies, and the comments provided throughout this article are a synthesis of the vast body of literature consulted before and during the various phases of this research project. Where the literature was found to be of poor quality or absent, consensus based on expert opinion was used. Although the investigators and collaborators carefully searched for all relevant articles, it is probable that some have been missed. Furthermore, as many new important studies are published in the near future, these will be incorporated in subsequent revisions of the guidelines and recommendations may change accordingly.

What These Guidelines Do and What They Do Not Do 

These guidelines are intended to address issues faced by first-contact professionals only. These guidelines do not address all possible conditions associated with musculoskeletal disorders, only those that account for most initial visits to a practitioner.

Like other diagnostic tests, imaging studies should only be considered if (a) they yield clinically important information beyond that obtained from the history and physical examination, (b) this information can potentially alter patient management, and (c) this altered management has a reasonable probability to improve patient outcomes.9, 10, 11

Investigators and collaborators in the development of these imaging guidelines believe that liability insurance companies, third-party payers, and courts of law should not rely solely on descriptions of patient presentations, proposed recommendations, and/or corresponding comments found throughout the documents because patient presentations are unique and the application of any guideline always requires clinical judgment and thus needs to be considered in the proper context. In addition, laws and regulations may vary between geographical regions and should be considered when applying the proposed indications for any imaging study.

What is Evidence-Based Health Care? 

Evidence based is about tools, not about rules.12 Evidence-based health care is an approach in which clinicians and health care professionals use the current best evidence in making decisions about the care of patients. It involves continuously and systematically searching, appraising, and incorporating contemporaneous research findings into clinical practice. The overall goal is improving patient care through life-long learning.12,13

Potential Disagreements 

There are several reasons for disagreement within a guideline development group. These include differences in interpretation of the research literature, differences in personal experience, and different perceptions of the inherent risks and benefits of a procedure.14 Divergent or competing guidelines on similar topics serve only to further confuse and frustrate practitioners.15 In addition, the continued lack of unity among chiropractors hinders growth of the profession by limiting integration and cooperation within the greater health care system. Readers of any guidelines are advised to critically evaluate the methods used as well as the content of the recommendations before adopting them for use in practice.16

Standard Patient Management Activities 

Standard patient management activities, including diagnostic assessment and follow-up, are integral components of every patient encounter.17 Initial triage of patients with musculoskeletal disorders is a constant recommendation of various clinical guidelines.18 Imaging studies are used most practically as confirmation studies once a working diagnosis is determined. The objective is to determine the presence of clinical indicators of serious pathologies (red flags) requiring diagnostic imaging, specialist referral, or urgent surgical intervention. When a practitioner recommends that a radiograph or other diagnostic imaging study be performed, and the patient refuses, the patient should be advised of the associated risks and implications and this should be recorded in the patient's records.

Duration of Disorders 

In clinical practice, musculoskeletal disorders are generally divided into categories according to the duration of the patient complaint on initial presentation. These diagnostic imaging guidelines therefore consider the following categories of clinical presentations: acute extremity disorder (<4 weeks of duration), subacute extremity disorder (4-12 weeks of duration), and persistent/chronic extremity disorder (>12 weeks of duration).

Are there Potential Risks Associated with Conventional Radiographs? 

Although somewhat controversial,19, 20, 21, 22 it is important to remember that health hazards of all forms of radiation are cumulative.22, 23, 24, 25, 26, 27, 28, 29 The Biological Effects of Ionizing Radiation (BEIR VII) 2005 report released by the National Academy of Sciences adds further support to the “linear-no-threshold” model of cancer risk from ionizing radiation exposure.30 In summary, this report concludes that ionizing radiation is dangerous even at low doses and that there are no safe limits. Given the potential risks associated with conventional radiography, only appropriate clinical indications can justify its use. In this regard, the need to confirm pathology, to follow the evolution of a pathology possibly affecting therapy, or to identify a clinically suspected contraindication to manipulative therapy are the best-documented reasons. The benefits of all diagnostic studies must outweigh the risks and the inherent costs to the patient.9, 31, 32, 33, 34, 35, 36, 37, 38, 39

Uppercase letters enclosed by brackets in both tables and the appendices represent the grading for each recommendation according to SPREAD, while considering the level of evidence (LOE) of studies reviewed during the literature review of Phase 2. Supplementary data associated with this article can be found, in the online version, at doi:10.1016/j.jmpt.2007.10.003 and in tables DI-D3 in Appendix D of Reference 2.

Table 1, Table 2, Table 3 list the patient presentations, recommendations, and comments regarding diagnostic imaging for lower extremity disorders. A list of abbreviations and glossary of terms used in the recommendations are in Appendix A. Appendix B provides a summary of the recommendations. General indications for advanced imaging in extremity disorders are presented in Appendix C. Typical effective ionized radiation dose for common imaging procedures are listed in Appendix D. Further recommended reading pertaining to magnetic resonance imaging of the lower extremity is offered in Appendix E.

Practical applications


History taking and physical examination should be used to exclude red flags and serious injuries (fracture and/or dislocation).

Physical examination is important for neurologic screening.

These guidelines may assist with diagnostic triage (extremity pain with or without restriction of activity of daily living or presence of red flags).

Radiographs are not initially indicated for non specific hip, knee, ankle and foot pain.

Consider conventional radiography after blunt trauma, and if there is no improvement after 4 weeks of conservative care or increasing disability

Consider conventional radiography and specialized imaging in the presence of red flags.

Table 1. Adult hip disorders
Patient presentationRecommendationsComments
Adult patients with full or limited movement and nontraumatic hip pain of <4 wk of duration40, 41, 42Radiographs not initially indicated [C]Radiographs are typically not useful for referred pain: Hip pain may originate from many other sources such as the lumbar spine, knee joint or intra-abdominal sites (urologic, gynecologic, gastrointestinal problems).42, 43
Symptoms are often transient. History, type of pain, and site of pain are the most important features to direct the diagnostic strategy. Physical examination is primarily to discriminate between articular involvement and referred pain.3 Each age and gender exhibit typical specific hip, pelvis, and proximal thigh problems and diseases. Radiographs are typically not useful for: trochanteric and iliopsoas bursitis, iliotibial band syndrome, meralgia paresthetica, labral tear, hip flexor, extensor or rotator muscle strain, and tendinitis.
General indications for radiographs include43, 44:If radiographs are indicated [B]Critical exclusionary diagnoses include:
• Failed conservative treatmentAP pelvis and AP frog leg views• Osteonecrosis6
• Complex history • Septic arthritis
• History of noninvestigated trauma • Acute fractures and avulsion fractures
• Significant unexplained hip pain with no previous films • Malignant tumors
• Loss of mobility in undiagnosed condition • Also consider femoroacetabular impingement syndrome in patients aged 20–30 y (see congenital/developmental abnormalities)45, 46
• Acute or subacute onset of intermittent lockingSpecial investigations [C]• MRI is the procedure of choice to exclude osteonecrosis, marrow and joint disease including infection43, 47
• Palpable enlarging mass
Consult specific clinical diagnoses and related patient presentations for additional help in decision making. Presence of one red flag alone may not necessarily indicate the need for radiography
Specific clinical diagnoses
1. Strain, tendinitis, or tendinosisRadiographs indicated in suspected osseous avulsion fracture [D]Partial or complete avulsion (bone-tendon junction injury) may result from isolated trauma or repeated straining. Overall, avulsions are more frequent in the anterior pelvis.50
Injury occurs at muscle or tendon attachment or open apophysis.AP pelvis and AP frog leg viewsAvulsion fracture of ischial tuberosity is a rare condition that generally occurs in young athletes.51, 52
Most likely occur in horse riders, skiers and skaters or from stepping in a hole.48 Radiographs reveal displaced avulsion fragment, with bone erosion and proliferation.53
History: Typical muscles and tendons involved:
• Often after eccentric ballistic muscle action (eg, basketball, football) • Adductor longus
Clinical features: • Rectus femoris
• Pain aggravated by activity, resistance testing, and with length-tension evaluation (muscle stretch) • Hamstrings
• ‘‘Snapping hip’’ usually results from iliopsoas tendinitis (internal) or iliotibial band (external) involving both the bursa and tendon.49 • Iliopsoas
• Suspect adductor muscle strains with medial or anterior thigh pain aggravated by passive abduction or resisted adductionSpecial investigations [D]• MRI for soft tissue involvement (edema, hemorrhage, frank disruption) and bony abnormality54, 55, 56
• US may demonstrate site and amount of tissue disruption.
2. Piriformis syndrome57, 58, 59, 60, 61Radiographs not initially indicated [D]
Clinical features:
• Dull posterior hip or buttock pain radiating down the legSpecial investigations [D]• MRI if unresponsive to care to assess muscle asymmetry and sciatic nerve hyperintensity at the sciatic notch (specificity, 0.93; sensitivity, 0.64).59 May exclude anatomical variations such as divisions of sciatic nerve splitting piriformis and predisposing nerve to compression.
• May mimic discogenic radicular pain and facet joint referred pain • MRI or US may reveal bursitis.
• Limping
• Pain aggravated by active external rotation,passive internal rotation, or palpation of sciatic notch.
3. Nontraumatic trochanteric and iliopsoas bursitisRadiographs not initially indicated [D]
Clinical features:
• Localized tenderness and painSpecial investigations [D]• MRI useful in chronic or recurrent bursitis and is most accurate for iliopsoas bursitis.63
• Moderate perceived weakness on resistive testing and length-tension evaluation (whereas true weakness may suggest abnormality such as avulsion of underlying muscle)62 • US is a cost-effective, easy-to-perform, and fast alternative. However, it fails to demonstrate iliopsoas bursitis in about 40% of cases.64
4. Osteoporotic femoral neck fracturesRadiographs indicated [C]Urgent orthopedic referral necessary:
Clinical features:AP spot and AP pelvis viewEstimated elevated risk of osteoporotic hip fractures in females aged >50 y is 17.5% in Canada.67
• Patients typically >65 YOA Hip fracture is the most costly result of osteoporosis as it always requires hospitalization, is fatal in 20% of cases, and permanently disables a further 50%. Only 30% recover fully; 1.7 million hip fractures occurred worldwide in 1990.68
• Often before or after a fall Counsel all women on the risk of osteoporosis and related fractures69 and on rehabilitation70
• Unable to walk Advanced imaging and specialist referral recommended
• May exhibit shortening and external rotation of the affected limb and localized hip pain65 • If radiographs are negative but clinically suspected, consider MRI, CT, or NM.
Occasionally:Special investigations [D]• Dual-energy x-ray absorptiometry recommended (see adult thoracic spine for details)
• No history of trauma
• Able to walk
• Nonspecific leg discomfort
• No obvious shortening or malrotation deformity65, 66
5. Septic arthritis of the hip43Radiographs indicated [C]Emergency referral:
Clinical features: • Life-threatening disease in 2%–5% and high morbidity42
• Significant pain on movement and weight bearingAP spot and AP frog leg views• Laboratory tests are crucial.43
• Malaise • MRI is the imaging modality of choice for infection.
• FeverSpecial investigations [D]• Joint aspiration or surgery43, 71
• NM very sensitive but not specific for suspected septic arthritis and osteomyelitis41, 43
Consider obtaining radiographs in adult patients with chronic hip pain unresponsive to 4 wk of conservative care or if one of the following conditions is suspected72, 73, 74, 75:Radiographs indicated [D]See specific clinical diagnoses below
AP spot and AP frog leg
1. Congenital or developmental abnormalitiesAdditional views:
2. OA (limited ROM)AP pelvis in suspicion of congenital abnormality, osteonecrosis, inflammatory arthritis76
3. Inflammatory arthritisSpecial investigations [D]72, 74• Unenhanced MRI done 1st (highly sensitive)
4. Osteonecrosis • MR arthrography
5. Tumors • Anesthetic injection
6. Stress fractures or undisplaced fractures. • Examination under local anesthesia
• Diagnostic arthroscopy77
Specific clinical diagnoses
1. Congenital/developmental abnormalities45, 46, 78Radiographs indicated [D]Orthopedic referral recommended
Plain film radiograph as primary investigation for chronic hip pain.Standing AP pelvis and recumbent AP false profile view46(a) Acetabular dysplasia:
Radiographic findings:
• Abnormal CE angle
(a) Acetabular dysplasiaAdditional views46:• Increased acetabular slope
Exclude in athlete <30 YOA with chronic hip painAbduction view of the hip (to determine eligibility for joint preserving surgery)• Nonspheroid or oval femoral head
May be bilateral • >25% of femoral head outside acetabular cavity64, 79

(b) Labral tear and femoroacetabular impingement (b) Labral tear:
Radiographic findings:
Clinical features: • Typically normal in labral tears
• “Knife sharp” groin painSpecial investigations [D]• Unenhanced MRI for hip articular cartilage and labrum defects80
• Painful giving way syndrome
• Locking • MRI arthrography has high accuracy (90%) and diagnostic arthroscopy with labral resection79, 81, 82
• Painful clunk or snapping hip
• Painful apprehension tests (forced hyperextension-external rotation in slight abduction)
Labral tear MRI findings:
• Painful impingement test (forced flexion adduction). • Focal chondral defects
• Synovitis
• Unossified intra-articular bodies
• Concomitant pathologic findings, such as intra-and extra-articular ganglia or edema of the subchondral bone, may lead to early OA.
• (It is unclear if labral tear can lead to DJD)83
• MR arthrography: provide for accurate diagnosis
2. Osteoarthritis (degenerative joint disease)Radiographs indicated [B]Patients >40 YOA with a new episode of hip pain present with evidence of DJD in 44% of cases44
Clinical features:AP spot and AP frog leg views
• ≥40 YOA Independent predictive factors for progression of DJD of the hip: age, female sex, presence of hip pain, joint space width at baseline = .5 mm, and a Kellgren and Lawrence score of ≥2 at baseline (LOE III).87
• Hip pain only with possible protective limp
• Activity-induced symptoms that improve with rest
• Stiffness: in the morning or with periods of inactivity Monitoring: staging also useful for surgical consideration and rapid onset DJD.53, 88, 89 Precise reproducible radiograph required.90
• May be bilateral
• Significant decrease in pain with weight loss and exercise in patient >60 YOA84, 85
Test for ROM:
Restricted and painful internal rotation: 3 planes ROM limitations less sensitive but more specific.86
3. Inflammatory arthritis (seronegative and seropositive)Radiographs indicated [D]Rheumatology referral recommended if persistent inflammatory joint disease (>6–8 wk) even with analgesics and NSAID.91
Unrelenting morning stiffness >30 min, pain at rest, pain or stiffness better with light activity, polyarticular involvement, warmth, effusion, diffuse tenderness, decreased ROM; fever/chills or other systemic symptoms, responsive to NSAID/steroid, flexion and adduction contracture in long-standing arthritisAP spot and AP frog leg viewsRadiographic changes in suspected RA: symmetrical distribution; joint effusion, fusiform soft tissue swelling, diffuse joint space narrowing, regional osteoporosis, marginal/central erosions, subchondral bone cysts, and absence of osteophytes.93 Laboratory tests necessary to exclude RA.92
RA diagnostic criteria (≥4 of 7 required)91, 92:AP pelvis may also be warranted as initial study to assess both hipsRA may involve all articular components (fibrous capsule, subchondral bone, cartilage) and extra-articular structures (bursae, tendon sheath).93
• Morning joint stiffness >1 hSpecial investigations75, 78, 80 [D]
• Arthritis involving ≥3 joints for at least 6 wkMRI highly sensitive and often more specific than US; detection of synovial pannus, erosions, cartilage loss, small subchondral cysts, and marrow edema distribution93, 94, 95
• hand arthritis (wrist, MCP, PIP)
• Symmetric arthritis
• Rheumatoid nodules
• Serum Rh factor
• Radiographic changes
Risk of osteonecrosis with high-dose corticosteroid therapy.US may show effusion and osseous erosions.96
4. Osteonecrosis (avascular necrosis)43, 47, 76, 97Radiographs indicated [B]Orthopedic referral recommended
Clinical features:AP spot and AP frog leg viewsAbnormal radiographic appearance in established disease. Staging is important for osteonecrosis natural history and indication for treatment.
• Most common in those <50 YOAConsider AP pelvis as initial examination as condition may be bilateral
• M:F= 8:1; in younger patients, M:F= 4.2:1
• Progressive groin pain that may refer to the knee Osteonecrosis results in 10% of total hip arthroplasties in United States.42
• Early stages: normal ROM
• Advanced stages: limitation of extension, internal rotation and abduction; limping and atrophy

Risk factors:Special investigations [B]Advanced imaging and specialist referral recommended
• Systemic corticosteroids
• Alcohol abuse MRI useful when radiographs are normal, especially in high-risk patients. Also NM and CT (when MRI unavailable)43, 97
• Radiation therapy
• Chemotherapy
• Metabolic disease
• Some autoimmune conditions
• Coagulopathies
• Deep sea diving/saturation diving
• Pregnancy
5. Tumors and metastatic lesions43, 47, 60, 76Radiographs indicated [D]Orthopedic referral essential
No specific clinical features; Spontaneous pathologic fracture often first sign of metastasis from breast, lung, or prostate cancerAP spot and AP frog leg viewsMetastatic disease, multiple myeloma, or chondrosarcoma involving the pelvis or femur are not uncommon in older patients with hip pain.
Special investigations [D]Advanced imaging recommended:
• NM, CT, MRI
6. Stress (fatigue or insufficiency) fractures65, 98Radiographs indicated [D]Orthopedic referral recommended
Exertional anterior hip pain, especially after an increase in training regimen; chronic repetitive overloads, typically in athletes or reduced mechanical bone properties (athletic amenorrhea, osteoporosis, corticosteroid use)99AP spot and AP frog leg viewsAdvanced imaging recommended
If radiograph is inconclusive, re-radiograph after 10–14 d of restricted use before proceeding to advanced imaging.• Bone scan, MRI, or CT in suspected occult, osteoporotic, or stress fractures98
Special investigations [D]
Patient presentation
Adult patients with significant hip traumaRadiographs indicated [C]The degree and nature of the trauma and age of the patient may warrant only routine images.
Delay in recognition and reduction of acute dislocation, fracture, and fracture-dislocation of hip leads to preventable complications and morbidity (LOE III).100, 101AP pelvis, AP centered of hip, right and left obliques of the pelvis, and true lateral views102Advanced imaging and specialist referral recommended:
Special investigations [C]• MRI for patients with significant hip pain after injury, especially when unable to bear weight; also to exclude occult fracture and possible labral tear.98

NSAID, Nonsteroidal anti-inflammatory drug.

Table 2. Adult knee disorders
Patient presentationRecommendationsComments
Adult patients with nontraumatic knee pain of <4 wk of durationRadiographs not initially indicated [C]Consider possible fractures even with trivial trauma in older patients (see Ottawa Knee rules)
Symptoms frequently arise from soft tissues not seen on radiographs.43, 103
Physical examination should include lower back, pelvis, hip, foot, and ankle as pain may be referred.
General indications for knee radiographs include43, 44, 104:When radiographs are indicated or unless otherwise specified [C]Critical exclusionary diagnoses include:
• History of noninvestigated trauma (with signs from the OKR—see below)• Standing AP views for joint space integrity• Occult fractures
• Complex history• Consider recumbent AP views if osseous detail is important.• Septic arthritis
• Significant unexplained effusion with no radiographs• Lateral view• Osteonecrosis
• Loss of mobility in undiagnosed condition• Tunnel (intercondylar) view• Infection
• Acute/subacute onset • Tumors
• Intermittent lockingSpecial investigations [C]• US useful to visualize superficial soft tissue structures (tendons, collateral ligament bursae); US less reliable for internal structures105, 106
• Unrelieved by 4 wk of conservative care • May be able to differentiate between degenerative and inflammatory causes of painful knee103
• Palpable enlarging mass • MRI best for internal derangements and can often prevent unnecessary knee arthroscopy43, 107
• Painful prosthesis
Presence of one red flag alone may not necessarily indicate the need for radiography. See Malanga et al104 for additional reading on physical examination of the knee.
Specific clinical diagnoses
1. Osteoarthritis (OA)43, 108, 109, 110Radiographs indicated if unrelieved by 4 wk of conservative care [B]The prevalence of OA as the cause of knee pain among adults is 34%. OA is generally a chronic condition. However, patients sometimes present with an acute exacerbation. Radiographic findings of OA changes are helpful when diagnosis is uncertain.107, 112
The clinical criteria for OA of the knee are:AP, lateral, and intercondylar views if radiographs are indicatedRadiologic changes not strongly related to severity of joint pain or disability;113, 114, 115, 116 trial of conservative treatment appropriate if no effusion or a small effusion is present
If at least 3 of the following are present, sensitivity for OA is 0.95 and specificity is 0.69. If 4 criteria are present, sensitivity is 0.84 but specificity is 0.89.Annual radiographic evaluation not indicated as changes are often subtle and of doubtful clinical importance.111
History:Additional views: 45° (oblique) views if signs and symptoms do not correlate with standard views
• >50 YOA
• Morning joint stiffness <30 min
Physical examination:
• Crepitation
• Bony tenderness
• Bony enlargement
• No palpable warmthSpecial investigations [B]• US or MRI indicated if significant effusion and/or loss of joint space117
• Other characteristics include long-standing pain, no extra-articular symptoms; aggravated by weight bearing, climbing stairs, exercise; nonresponsive to NSAID or corticosteroid medication; relieved with rest; deformity or fixed contracture, joint effusion; insidious onset.
2. Inflammatory arthritis73, 91, 109 (seronegative and seropositive)
Diagnosis of inflammatory arthritis of the knee is primarily based on history and physical examination:
• Unrelenting morning stiffness >30 minRadiographs indicated [D]Rheumatology referral recommended if persistent inflammatory joint disease (>6–8 wk) even with analgesics and NSAID91
• Pain at restConsider bilateral AP standing viewsSpecialized care necessary if incapacitating instability, deformity, or pain
• Pain or stiffness better with light activity (during remission) See hip section for radiographic changes in RA93
• Polyarticular involvement, especially the hands Laboratory tests necessary to exclude RA92
• Palpable warmthSpecial investigations: [C]• US and MRI may aid in staging and as indicator of disease progression.43, 75, 118, 119
• Knee aspiration if positive for effusion
• Joint effusion
• Decreased ROM
• Fever/chills or other systemic symptoms
• Responsive to NSAID or corticosteroid medication
• Flexion and adduction contracture in long-standing arthritis
See also hip section for RA diagnostic criteria
3. Bursitis/tendinitis/strain/tendinosisRadiographs not routinely indicated unless [D]
Clinical features:• Unrelieved by 4 wk of conservative care
• Related to or aggravated by activity• Suspected avulsion fracture120
• Relieved or diminished symptoms at rest• Underlying arthropathy
• Point tendernessSpecial investigations [D]• MRI120, 121, 122
• Localized swelling (extra-articular) • US: puncture of a popliteal cyst and corticosteroid injection can be done under US guidance123
4. Anterior knee painRadiographs indicated if [C]
Clinical features:Unrelieved by 4 wk of conservative care
• Insidious onsetSuspected fracture
• Aggravated with steps/incline/rising from chairUnderlying arthropathy
• Stiffness with rest or glidingAdditional views:
Tangential patellar views to evaluate for chondromalacia, patellar tilt, or subluxation
• Pseudolocking or giving wayStress radiographs to evaluate for patellofemoral instability (stress view: valgus and internal rotation at 45° of knee flexion)125
• Tender patellar facets
• Positive apprehension tests
• Crepitation
• Abnormal Q angle • High-field MRI for chondromalacia and synovial plicae47, 122, 125, 126, 127, 128
Clinical tests for the diagnosis of chondromalacia patella have low sensitivity, specificity, predictive values, and accuracy compared with tests for arthroscopy.124Special investigations [C]• Contrast CT arthrography if MRI unavailable
5. Internal joint derangement43, 110Radiographs indicated if unrelieved by 4 wk of conservative care [B]Orthopedic referral or co-management recommended
Clinical features:Standard AP, lateral views if necessary after 4 wkIt is important to note that radiographs often fail to demonstrate the cause of pain.
History Possible injuries:
• Acute or subacute onsetAdditional views:• Intra-articular body
• Intermittent locking and/or giving wayTunnel, standing lateral, standing oblique• Meniscal tear
• Crepitation, snapping, and popping • Ligamentous injury
• Worse with activity • Avulsion fracture
• Improved with rest • Osteochondritis dissecans
(the accuracy of the clinical history in patients with suspected torn ligament or meniscus is unknown) • OA
Physical examination: • MRI is gold standard for internal knee derangements such as meniscal and ligamentous injuries.43, 130, 131
• Joint line tenderness • Spiral CT arthrography if MRI unavailable.103, 132
• Swelling and joint effusion
• Loss of ROMSpecial investigations [C]Physical examination104, 110:
Individual physical tests for meniscal lesions have little diagnostic value (meta-analysis.)129 However, the accuracy increased when orthopedic tests are used in combination for meniscal and ligamentous tear, suggesting physical examination is usually normal in patients without damage to these structures (see comments).110If diagnosis not well established from history, examination and radiographs or in the absence of clinical improvementMeniscal tear: joint line tenderness has a sensitivity of 0.76 (CI, 0.65–0.87) but low specificity, whereas McMuray test has a low sensitivity but high specificity (0.97; CI, 0.87–0.99). The Ege's test (weight-bearing McMurray's test) may be superior (84%, 0.64, and 0.90 for accuracy, sensitivity, and specificity, respectively)
Ligamentous tear: the best studied tests are the Lachman maneuver (sensitivity, 0.87 [CI, 0.76–0.98]); specificity, (0.93 [CI, 0.89–0.96]), the pivot test (lower sensitivity but higher specificity (0.97 [CI, 0.93–0.99]), and the Anterior Drawer Test (low sensitivity but specificity of 0.87 [CI, 0.83–0.97]).
CI of 95%
Adult with acute knee injury but negative findings for the OKR indicates that a fracture is very unlikely.133, 134, 135, 136, 137Radiographs not routinely indicated [B]Patient should be advised to return for follow-up if their pain has not improved in 7 d.6
High sensitivity (>0.98) for fractures
OKR: If the patient meets the following criteria after an acute knee injury, they do not require radiographs to look for a fracture:
• Patient <55 YOA
• Can walk 4 weight-bearing steps immediately after the injury and at presentation without a limp
• No isolated tenderness of the head of fibula or patella
• Able to flex knee >90°
May have a history of torsional injury and/or mild clinical signs (no immediate swelling, heat, ecchymosis, abrasion, or laceration)
Adult with acute knee injury and positive findings for the OKR133, 134, 135, 136, 137, 138, 139, 140Radiographs indicated in the presence of one or more of the OKR criteria [A]If radiographs are negative, but clinical signs are persistent, repeat films should be obtained 7–10 d after onset. Callus or deformity may become visible in the first month.
Radiographs required only in the presence of postinjury knee pain and any one of the following findings:AP supine and lateral viewsKnee fractures usually accompanied by ligamentous or meniscal damage6 (see internal joint derangement)
• ≥55 YOAAdditional views:Possible osseous injuries:
• Isolated tenderness at the head of the fibula or patellaBilateral oblique, tunnel, and tangential views• Tibial plateau fracture
• Inability to flex knee >90° • Anterior tibial spine fracture
• Inability to walk 4 weight-bearing steps both immediately and at presentation • Small intra-articular bone fragments
Radiographs should also be obtained in the presence of obvious deformity or mass. • Segond fracture (underlying ACL tear)
The following factors exclude patients from the OKR: • Intra-articular fractures (lipohemarthrosis sign on horizontal beam radiograph)
• <18 YOASpecial investigations [C]Advanced imaging and orthopedic referral recommended:
• Pregnancy • Valgus stress radiographs under general anesthesia125
• Isolated skin injury • MRI is the modality of choice for initial investigation of knee trauma.
• Referred with outside films • CT, US, and angiogram may be needed for additional information6, 132, 133, 134
• 7 d since injury
• Multiple injuries
• Altered level of consciousness
• Paraplegic

CI, Confidence interval; OKR, Ottawa Knee Rules.

Table 3. Adult ankle and foot disorders
Patient presentationRecommendationsComments
Adult with acute ankle and foot injury but negative findings on the OAR57, 141, 142, 143, 144, 145, 146, 147, 148, 149Radiographs not routinely indicated [B]Only rarely are radiographs of foot and ankle indicated together. Clinical abnormalities are usually confined to foot or ankle6
OAR: high-sensitivity (>0.89) for fractures.
Consider radiographs only of patients excluded from the OAR: Patient satisfaction does not appear to be related to the decision to order ankle radiographs.150
• Multiple injuries
• Isolated skin injury
• 10 d since injury
• Obvious deformity of ankle or foot
• Altered sensorium: cognitive or sensory impairment (neurologic deficit), head trauma, intoxicated
Pregnancy also excluded from OAR142
Adult with acute ankle and foot injury and positive findings on the OAR43, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150Ankle radiographs indicated [B]Whether radiographs are ordered or not, patient should be advised to return for follow-up radiographs if their pain or ability to bear weight has not improved in 7 days.6
(a) Ankle (positive OAR)AP ankle, 20° medial oblique (mortise view) and lateral (include base of fifth metatarsal)
Radiographs required only if there is pain in the malleolar zone and any of these findings:Additional views [D]
• Bone tenderness of distal fibula along posterior edge or tip of lateral malleolus (distal 6 cm)Stress radiographs after distal fibular fracture helpful preoperatively to determine deltoid ligament status in orthopedic setting151, 152, 153
• Bone tenderness of distal tibia along posterior edge or tip of medial malleolus (distal 6 cm)
• Inability to bear weight both immediately and in clinic
Also consider taking ankle radiographs in:
• Older patients with malleolar tenderness and pronounced soft tissue edema
• Presence of positive OAR foot findings
(b) Foot (positive OAR)43, 141, 142, 143, 144, 145, 146, 147, 148, 149Foot radiographs indicated [B]Look for fracture-dislocation (Lisfranc) as it has been estimated that 20% of Lisfranc injuries are missed on initial radiography, in which case, sequelae can be severe.155, 156, 157 (non-weight-bearing views can be normal)
Radiograph required only if there is pain in the midfoot zone and any of these findings:When feasible, weight-bearing foot AP, lateral, medial oblique views.For possible stress fracture, see chronic foot pain-forefoot section (C3).
• Bone tenderness of base of fifth metatarsalComparison views (of normal foot) may be helpful154
• Bone tenderness of navicular boneAdditional view
• Unable to bear weight both immediately and in clinicTangential view of calcaneus for heel trauma cases
Special investigations for ankle and foot [D]Advanced imaging and orthopedic referral recommended:
• MRI or CT appropriate in presence of significant pain and disability and negative radiographs158
• Fluoroscopic stress examination under anesthesia to assess ankle instability
• NM for persisting symptoms to exclude stress fracture
Adult with acute toe injuryRadiographs indicated [GPP]Radiography of the foot not required in the absence of metatarsal injury and normal physical exam
Consider obtaining foot radiographs in presence of significant metatarsal pain (see OAR-foot)AP, oblique, and lateral views limited to the toes
Adult with chronic ankle and tarsal pain159Radiographs indicated [D]When an osteochondral fragment can be seen on a radiograph, ligamentous injury is usually detectable clinically.
Radiographs routinely obtained as first option to exclude:AP ankle, lateral, medial oblique (mortise) views
• Arthritis(Medial oblique view helps evaluate the talocalcaneal relationship and lateral malleolus)
• Infection If radiograph appears normal with clearly abnormal clinical examination: MRI and diagnostic anesthetic injection may be indicated depending on pain, severity, and disability.
• Fracture and stress fracture
• Neoplasm
Specific indications for radiographs include159, 160:Additional view:
• Suspected osteochondral lesion/stress fractureStress radiographs may be considered, but little agreement exists as to which technique.162, 163, 164
• Suspected tendinopathy with possible inflammatory arthritis
• Possible ankle instability; Single-leg jump test as clinical indicator of functional instabilitySpecial investigations [D]MRI is the gold standard for musculoskeletal assessment if radiography is positive or if unrelieved by 4 wk of conservative care.158
• Noninvestigated chronic ankle and tarsal pain • MRI needed to exclude posttraumatic osteochondritis dissecans in ankle pain persisting> 6–8 wk
• Multiple sites of degenerative joint disease as visualized on radiographs of other regions
• Possible operative candidate • Contrast-enhanced, fat-suppressed, 3D, fast-gradient (or equivalent) MRI may be useful in diagnosing synovitis and soft tissue impingement.
For more information, see Grassi et al.161
Specific clinical diagnoses
1. Impingement syndromes160, 165Radiographs indicated [D]Radiographs may appear normal as soft tissue causes of impingement such as synovial hypertrophy are not visualized
Easily forgettable minor injuries may cause impingement syndromes; often mistaken for arthritisAP ankle, lateral, and mortise views• Accuracy and role of CT, US, and MR arthrography not clearly established for ankle impingement syndromes167
Findings most strongly associated with abnormality at arthroscopy166:Special investigations [D]• Contrast-enhanced, fat-suppressed, 3D, fast-gradient MRI may be indicated depending on pain, severity, and disability (sensitivity, 0.92; specificity, 0.84; accuracy, 87%).166
• Anterolateral tendernessFor all suspected impingement syndromes with positive radiographs or unrelieved by 4 wk of conservative care:
• Swelling
• Pain on single-leg squatting
• Pain on ankle dorsiflexion and eversion
(a) Anterolateral impingementRadiographs indicated [D]Possible radiographic findings:
Clinical features:AP, lateral, and mortise ankle views• Small osteophyte on the anterior tibial margin
• Mechanism: inversion injury • 50% have increased anterior translation of talar dome on stress radiographs. However, clinical significance of stress test remains unanswered.162, 163, 164
• Pain and localized tenderness in region of anteroinferior tibiofibular and/or anterior talofibular ligamentAdditional view:Stress radiographs may be considered
• Positive impingement sign (sensitivity, 0.95; specificity, 0.88)168Special investigations (see above):
(b) Anterior impingementRadiographs indicated [D]Possible radiographic findings:
• Clinical features:AP, lateral, and mortise ankle views• Osteophytes involving the distal tibia and the talar neck
• Mechanism: supination or repeated dorsiflexion injurySpecial investigations (see above):• Seen best on mortise views
• Anterior pain
• Painful and restricted dorsiflexion
(c) Anteromedial impingementRadiographs indicated [D]Possible radiographic findings:
Clinical features:AP, lateral, and mortise ankle views• Osteophytes involving the anteromedial talus
• Mechanism: inversion injury or ankle/talar fractureSpecial investigations (see above):
• Anteromedial pain and tenderness
• Swelling
• Pain and restriction on dorsiflexion and supination
(d) Posterior impingementRadiographs indicated [D]Possible radiographic findings: os trigonum
Clinical features:AP, lateral, and mortise ankle views• MRI for os trigonum syndrome169
• Mechanism: impingement of os trigonum between talus and posterior tibiaSpecial investigations [D]
• Common in ballet dancers
• Pain elicited with full weight-bearing in maximum plantar flexion, especially when os trigonum is present
• Tenderness behind lateral malleolus
• Pain with passive plantar flexion
2. Peroneal tendinosisRadiographs not routinely indicated [D]
Clinical features:Unless unrelieved by 4 wk of conservative care or patient has a suspected inflammatory arthritis170
• Lateral hindfoot painSpecial investigations [D]• MRI or US if there are signs of popping or clicking with foot eversion170, 171, 172, 173, 174
• Cavovalgus foot deformity
• Frequently affected in RA
3. Lateral premalleolar bursitisRadiographs not routinely indicated [GPP]
Clinical features:Special investigations [GPP]• US if unrelieved by 4 wk of conservative care
• Adventitious bursa develops in people sitting with inverted and plantar flexed feet
4. Tarsal tunnel syndrome58, 175, 176Radiographs not routinely indicated [D]
Clinical features:
• Tingling pain and burning over the sole of the foot after prolonged standing or walkingSpecial investigations175, 176, 177, 178, 179: [D]MRI best for differential diagnosis of the following:
• US or MRI for nerve and other soft tissue visualization
• Worse at night in some• Interdigital neuroma
• Positive Tinel sign• CT for bony abnormalities• Plantar fascitis
• Positive nerve compression test• Sensory conduction velocity and distal motor latency useful for diagnosis and treatment progression• Tibialis posterior tenosynovitis
• 2-Point discrimination• Tarsal coalition
• Hypoesthesia on sole of foot
• Rare weakness of toe flexion Consider local injection therapy for persistent pain and disability in cases of failed conservative therapy.180
Adult with chronic foot pain181, 182Radiographs indicated [C]Medial oblique helps evaluate forefoot and lateral oblique the tarsal and Chopart joints.
Non–weight-bearing AP, lateral, medial, and lateral oblique views
Differential diagnosis:Additional views:In suspected RA, foot radiographs may show erosions even when symptomatic hand(s) appear normal.6
• Common complications of diabetes mellitus• Lateral views for toesHigh prevalence of midfoot and forefoot involvement in RA (53%–92%). Hindfoot and ankle affected later.183, 184
○ Foot infection• Axial and lateromedial tangential views for sesamoid bonesLaboratory investigations (blood and synovial fluid) recommended:
○ NeuroarthropathySpecial investigations [D]• NM, MRI, US, arthrography may be useful181, 182
• Arthritis
○ Most of the common forms of arthritis affect the feet and can cause foot pain
• Vasculitis
• Neurologic involvement
○ Polyneuropathies
○ Cervical myelopathies
○ Sciatica
○ Mononeuritis multiplex
A. Hindfoot-heel pain43, 161, 182, 185Radiographs indicated only in specific circumstances [C]Radiographs used to exclude trauma of the calcaneus and tarsal coalition
Differential diagnosis:AP, lateral, and medial oblique views of the foot
• Plantar fasciitis (common)
• Calcaneal stress fractureAdditional views:
• Tarsal tunnel syndrome
• Diabetes mellitusTangential view of the calcaneus and lateral calcaneus view
• Long-term hemodialysis
• Achilles or plantar enthesopathySpecial investigations43, 103: [D]• MRI if unrelieved by 4 wk of conservative care or before orthopedic or pediatric referral
• Inflammatory arthritis • Achilles enthesopathy: power Doppler sonography may show neovascularization that may be the cause of pain
○ Consider reactive arthritis (Reiter syndrome) with bilateral heel pain in young patient (second decade) with heel pain and toe inflammation
Specific clinical diagnoses
A1. Plantar fasciitis and calcaneal enthesophyte (spur)43, 182Radiographs not routinely indicated except in young athlete [B]Plantar spurs are common incidental findings. The cause of the pain is seldom detected on radiograph. Most patients can be managed without imaging.
Clinical features:AP, lateral, and oblique viewsConsider ankle dorsiflexion night splinting for treatment of recalcitrant PF187, 188
• PF is one of the most common soft tissue foot disordersSpecial investigations [D]• US may be initial step for advanced imaging (readily available, highly sensitive, low-cost, and radiation-free).189
• Hyperesthesia over the plantar fascia • Doppler/power US improves US value190
• Risk factors186: • US, MRI, and bone scan are more sensitive in demonstrating inflammatory changes and thickening of the plantar aponeurosis in PF.43, 191, 192
○ Decreased ankle dorsiflexion (≤0°)
○ Being on feet most of working day
○ Obesity (body mass index >30 kg/m2)
A2. Sinus tarsi syndromeRadiographs not initially indicated [D]Radiographs generally not valuable in this assessment. Furthermore, radiography does not depict any signs of hindfoot instability unless stress views are performed.194
Clinical features: Sinus tarsi syndrome may result in OA of subtalar joint.
• Mechanism: inversion injury or inflammatory joint diseases • MRI if unrelieved by 4 wk of conservative care: may be helpful for detecting subtle unilateral deformities195
• Lateral foot pain
• Perceived foot instability
• Tenderness of the sinus tarsi
No agreement on pathognomonic history, clinical tests, or imaging studies that could help in confirming the diagnosis or establishing the etiology; may be related to instability of the subtalar joint193Special investigations [D]
B. Midfoot pain (nontraumatic)161Radiographs indicated if unrelieved by 4 wk of conservative care or in suspected inflammatory arthritis [D]Midfoot erosive disease difficult to assess on radiographs
Midfoot pain usually self-limitingAP, medial oblique, and lateral views of the foot
Differential diagnosis:Additional views:
• RAWeight-bearing ankle series may be useful
• Psoriatic arthritisSpecial investigations [GPP]• CT or MRI warranted in suspected or proven disease, but negative/equivocal radiographs.
• Reactive arthritis (Reiter disease)If radiography is positive or if unrelieved by 4 wk of conservative care:White blood cell tagged bone scan to differentiate between infection and diabetic neuroathropathy
• Gout
• Diabetic neuroarthropathy
• Diabetic infection
Specific clinical diagnoses
B1. Acquired flat foot with posterior tibial tendon dysfunction/rupture196, 197, 198, 199Radiographs indicated if unrelieved by 4 wk of conservative care or in suspected inflammatory arthritis [D]Other causes of flatfoot
Posterior tendon rupture results in:AP, medial oblique, and lateral foot radiographs• Inflammatory arthritis
• Acquired flatfootAdditional views:• Tarsometatarsal OA
• Valgus hindfootWeight-bearing ankle series may be useful• Tarsal coalition
• Forefoot abduction • Neuropathic arthropathy
Clinical features: • Traumatic ligament disruption
• Medial ankle/foot pain initially • Neuromuscular diseases
• May lead to disabling weight bearing symptomsSpecial investigations [D]• MRI better at differential diagnosis of medial ankle/foot pain.
• Talonavicular subluxation • US may be useful
• Difficulty or inability to perform single-limb heel rise For review of MRI usefulness, see Yu and Tanner.200
• Weak resisted inversion of fully flexed foot
B2. Navicular tuberosity pain and tenderness182Radiographs indicated if unrelieved by 4 wk of conservative care [C]
Potential painful normal variants such as accessory navicular bone (4%–21% of the population) have been described.AP, medial oblique, and lateral foot views
Painful fibro-osseous junction of the accessory boneSpecial investigations [GPP]• MRI to differentiate accessory navicular from an avulsion fracture
• NM may be useful to help identify or confirm site of pain.
B3. Complex regional pain syndromeRadiographs indicated [D]Diffuse osteopenia seen in 70% of cases.
Synonyms:AP, lateral, and medial oblique views of the foot
• Reflex sympathetic dystrophy
• Sudek's atrophySpecial investigations [D]Advanced imaging and orthopedic referral recommended:
Clinical features:
• Pain • MRI is useful in detecting numerous soft tissue and earlier bone and joint processes that are not depicted or as well characterized with other imaging modalities.200
• Tenderness
• Swelling
• Diminished motor function
• Vasomotor and sudomotor instability • 3-Phase NM scan recommended if radiograph is not diagnostic (sensitivity, 0.100; specificity, 0.80; positive predictive value, 54%; negative predictive value: 100%)
Associated conditions:
• Fractures or other trauma
• CNS and spinal disorders
• Peripheral nerve injury148
Specific clinical diagnoses
C. Forefoot painRadiographs not routinely indicated unless unresponsive to 4 wk of conservative care or if inflammatory or infectious etiology suspected [B]
Common site of foot painAP and lateral foot views
Etiologies not easily identifiable by physical examination201Special investigations [D]• MRI useful in differential diagnosis of forefoot pain such as stress fracture, metatarsophalangeal synovitis, and intermetatarsal bursitis184, 201
See recommendations for the following specific clinical diagnoses:
C1. Metatarsal bursitis
C2. Morton neuroma182
C3. Stress fracture4
C4. Osteonecrosis
C5. Hallux rigidus and hallux valgus4
C6. Sesamoiditis
C1. Metatarsal bursitisRadiographs not routinely indicated unless unresponsive to 4 wk of conservative care: or if inflammatory or infectious etiology suspected [GPP]
Possible causes:AP and lateral foot views
• MTP overstrain and repetitive traumaSpecial investigations [GPP]• MRI useful in differential diagnosis of forefoot pain201
• Infection
• RA
• seronegative spondyloarthropathy
• gout
C2. Morton neuroma182Radiographs indicated [C]Local anesthetic may be required to differentiate from MTP arthritis
Clinical features:AP, lateral, with or without oblique• MRI: high sensitivity (0.87; with specificity of 100%) for demonstration of Morton neuroma58, 202
• Most commonly found in the 3–4 web space • MRI also useful in differential diagnosis of forefoot pain201
• Pain hyperesthesia or paresthesia radiation to the toesSpecial investigations [D]
• Differential diagnosis from metatarsophalangeal arthritis may be difficult
• Positive forefoot neuroma squeeze test
C3. Stress (fatigue or insufficiency) fracture43, 203, 204Radiographs indicated [D]If radiograph is inconclusive, re-radiograph after 6 wk of restricted use before proceeding to advanced imaging
High-risk patients:AP and lateral foot views with or without medial oblique specific to the area of complaint• High-field MRI with fat suppression or inversion recovery protocol. As sensitive as NM (100% sensitive)43, 205
(a) Athletes: • CT still uncertain43; some centers use US
• RunningSpecial investigations [C]
• Dancing
• Walking
• Other weight-bearing sports
(b) Middle-aged or elderly patients:
• Weight-bearing activities
• Long-term corticosteroid
Clinical features:
Pain and tenderness in the:
• First, second and third metatarsal
• Calcaneus
• Medial sesamoid
• Navicular
C4. Osteonecrosis of the metatarsal head (Freiberg infraction)6Radiographs indicated: [C]Radiographic findings (metatarsal head):
AP, lateral, with or without medial oblique of the foot• Increased density
Clinical features182:• Flattening, collapse
• Adolescent patient • Cystic changes
• Pain • Widening of MTP joint
• TendernessSpecial investigations [C]• MRI modality of choice to evaluate bone marrow changes in early stages
• Swelling
• Limitation of movement at metatarsal head
• Second or third head most commonly affected
C5. Hallux rigidus and hallux valgus (first MTP joint)Radiographs not routinely indicated unless unresponsive to 4 wk of conservative care [D]Radiographs, if obtained, are usually for assessment pre- and post-bunion surgery.43
Both very common foot disorders resulting in significant morbidity.Lateral view most useful for dorsal osteophyte on the metatarsal head and possible osseous fragments209
Possible cause includes DJD, hallux fracture, and fibrous dysplasia.206, 207, 208 Chronic tophaceous gout characterized by extra- and intra-articular erosions, often causing Martel's hook (overhanging margin of bone erosion).165
Differential diagnosis:Additional view210:
• GoutWeight-bearing series to quantify degree of valgus deformityDegree of valgus deformity may influence management (orthotics or surgery)
• CPPD
• Hydroxyapatite
C6. Sesamoiditis211Radiographs not routinely indicated unless unresponsive to 4 wk of conservative care: [D]Possible complications in physically active young and middle age:
Painful inflammatory condition caused by repetitive injury; reactive tendinitis, synovitis, or bursitis common • Avascular necrosis
Additional view:• Nonunion fracture
Lateromedial and tangential views for sesamoid bones• Hypoplasia
• Osteochondrosis
Special investigations [GPP]• MRI to differentiate from turf toe

See Bálint et al165 for additional reading on ankle and foot disorders, and Bucholz and Heckman212 for fractures in adults.

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Acknowledgment 

The authors are appreciative of the efforts of the many people who assisted in this process, listed in Appendix F.

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Appendix A. List of Abbreviations and Glossary for Lower Extremity Disorders 

ACL: 

anterior cruciate ligament

 
AP: 

Anteroposterior

 
AS: 

ankylosing spondylitis

 
Osteonecrosis: 

avascular necrosis

 
CPPD: 

calcium pyrophosphate dihydrate crystal deposition disease

 
CNS: 

central nervous system

 
CT: 

computed tomography

 
Ddx: 

differential diagnosis

 
DJD: 

degenerative joint disease

 
Dx: 

diagnosis

 
GHQ questionnaire: 

General Health Questionnaire History

 
IAB: 

intra-articular osteocartilaginous body

 
JRA: 

juvenile rheumatoid arthritis

 
LOE: 

level of evidence

 
MC: 

most common

 
MSK: 

Musculoskeletal

 
MTP joint: 

metatarsophalangeal joint

 
MRA: 

magnetic resonance arthrography

 
MRI: 

magnetic resonance imaging

 
NM: 

nuclear medicine (bone scan)

 
OAR: 

Ottawa ankle and foot rules

 
OKR: 

Ottawa knee rules

 
PA: 

posteroanterior

 
PF: 

plantar fasciitis

 
ROM: 

range of motion

 
R/O: 

rule out

 
RA: 

rheumatoid arthritis

 
Sp: 

specificity

 
Sn: 

sensitivity

 
Tendinosis: 

degeneration of tendons and of tendon muscle attachments

 
US: 

ultrasound

 
x-ray: 

plain film radiograph

 
YOA: 

years of age

 
>: 

greater than

 
≥: 

equal or greater than

 
Ψ: 

psychology/psychiatry

 

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Appendix B. Summary of Recommendations 

Table 1. Summary of recommendations—adult hip disorders

Patient presentationRecommendations
Adult patients with full or limited movement and nontraumatic hip pain of <4 wk of durationRadiographs not initially indicated [C]
Symptoms are often transient. Physical examination is primarily to discriminate between articular involvement and referred pain. Each age and sex exhibit typical specific hip, pelvis, and proximal thigh problems and diseases.
General indications for radiographs include:If radiographs are indicated [B]
• Failed conservative treatmentAP pelvis and AP frog leg views
• Complex history
• History of noninvestigated trauma
• Significant unexplained hip pain with no previous films
• Loss of mobility in undiagnosed condition.
Special investigations [C]
• Acute or subacute onset of intermittent lockingMRI is the procedure of choice to exclude osteonecrosis, marrow and joint disease including infection
• Palpable enlarging mass
Specific clinical diagnosesConsult specific clinical diagnoses and related patient presentations for additional help in decision making.
1. Strain, tendinitis or tendinosisRadiographs indicated in suspected osseous avulsion fracture [D]
Clinical features:AP pelvis and AP frog leg views
• Pain aggravated by activity, resistance testing, and with length-tension evaluation (muscle stretch)
• ‘‘Snapping hip’’ usually results from iliopsoas tendinitis (internal) or iliotibial band (external) involving both the bursa and tendon.Special investigations [D]
• Suspect adductor muscle strains with medial or anterior thigh pain aggravated by passive abduction or resisted adduction• MRI for soft tissue involvement (edema, hemorrhage, frank disruption) and bony abnormality
• US may demonstrate site and amount of tissue disruption.
2. Piriformis syndromeRadiographs not initially indicated [D]
Clinical features:
• Dull posterior hip pain radiating down the legSpecial investigations [D]
• May mimic discogenic radicular pain and facet joint referred pain• MRI if unresponsive to care to assess muscle asymmetry and sciatic nerve hyperintensity at the sciatic notch.
• Limping• MRI or US may reveal bursitis.
• Pain aggravated by active external rotation, passive internal rotation, or palpation of sciatic notch.
3. Nontraumatic trochanteric and iliopsoas bursitisRadiographs not initially indicated [D]
Clinical features:
• localized tenderness and painSpecial investigations [D]
• Moderate perceived weakness on resistive testing and length-tension evaluation (whereas true weakness may suggest abnormality such as avulsion of underlying muscle)• MRI useful in chronic or recurrent bursitis and is most accurate for iliopsoas bursitis
• US is a cost-effective, easy-to-perform, and fast alternative. However, it fails to demonstrate iliopsoas bursitis in about 40% of cases.
4. Osteoporotic hip fracturesRadiographs indicated [C]
Clinical features:AP spot and AP pelvis view
• Patients typically aged >65 y
• Often after a fall
• Unable to walkSpecial investigations [D]
• May exhibit shortening and external rotation of the affected limb and localized hip painIf radiographs negative but clinically suspected, consider MRI, CT, or NM.
• Dual-energy x-ray absorptiometry recommended (see adult thoracic spine for details)
Occasionally:
• No history of trauma
• Able to walk
• Nonspecific leg discomfort
• No obvious shortening or malrotation deformity
5. Septic arthritis of the hipRadiographs indicated [C]
Clinical features:AP spot and AP frog leg views
• Significant pain on movement and weight bearing
• MalaiseSpecial investigations [C]
• Fever• MRI is the imaging modality of choice for infection.
• Joint aspiration or surgery
• NM very sensitive but not specific for suspected septic arthritis and osteomyelitis
Patient presentationRecommendations
Consider obtaining radiographs in adult patients with chronic hip pain unresponsive to 4 wk of conservative care or if one of the following conditions is suspected:Radiographs indicated [C]
1. Congenital or developmental abnormalitiesAP spot and AP frog leg
2. OA (limited ROM)Additional views: AP pelvis in suspicion of congenital abnormality, osteonecrosis, inflammatory arthritis
3. Inflammatory arthritisSpecial investigations [C]
4. Osteonecrosis• Unenhanced MRI done first (highly sensitive)
5. Tumors• MR arthrography
6. Stress fractures or undisplaced fractures• Anesthesia injection
• Examination under local anesthesia
• Diagnostic arthroscopy
Specific clinical diagnoses
1. Congenital/developmental abnormalitiesRadiographs indicated [D]
Plain film radiograph as primary investigation for chronic hip pain, “knife sharp” groin pain, painful giving way, locking and painful clunk, and painful apprehension and impingement tests includes:Standing AP pelvis and recumbent AP false profile view
(a) Acetabular dysplasiaAdditional views: Abduction view of the hip (to determine eligibility for joint preserving surgery)
Exclude in athlete aged <30 y with chronic hip pain.Special investigations [D]
(b) Labral tear and femoroacetabular impingement• Unenhanced MRI for hip articular cartilage and labrum defects
Clinical features:• MRI arthrography has high accuracy (90%) and diagnostic arthroscopy with labral resection
• “Knife sharp” groin pain
• Painful giving way syndrome
• Locking
• Painful clunk or snapping hip
• Painful apprehension tests (forced hyperextension-external rotation in slight abduction)
• Painful impingement test (forced flexion adduction)
2. OA (DJD)Radiographs indicated [B]
Clinical features:AP spot and AP frog leg views
• Age ≥40 y
• Hip pain only with possible protective limp
• Activity-induced symptoms
• Improvement with rest
• Stiffness: in the morning or with periods of inactivity
• May be bilateral
• Significant decrease in pain with weight loss and exercise in patient aged >60 y
Test for ROM:
• Restricted and painful internal rotation (LOE III)
• 3 Planes ROM limitations less sensitive but more specific
3. Inflammatory arthritis (seronegative and seropositive)Radiographs indicated [D]
○ Unrelenting morning stiffness >30 min, pain at rest, pain or stiffness better with light activity, polyarticular involvement, warmth, effusion, diffuse tenderness, decreased ROM; fever/chills or other systemic symptoms, responsive to NSAID/steroid, flexion and adduction contracture in long-standing arthritis.AP spot and AP frog leg views
RA diagnostic criteria (≥4 of 7 required):AP pelvis may also be warranted as initial study to assess both hips
• Morning joint stiffness> 1 hour
• Arthritis involving ≥3 joints for at least 6 wkSpecial investigations [D]
• Hand arthritis (wrist, MCP, PIP)MRI highly sensitive and often more specific than US. Detection of synovial pannus, erosions, cartilage loss, small subchondral cysts, and marrow edema distribution
• Symmetric arthritis
• Rheumatoid nodulesUS may show effusion and osseous erosions
• Serum Rh factor
• Radiographic changes
4. Osteonecrosis (avascular necrosis)Radiographs indicated [B]
Clinical features:AP spot and AP frog leg views
• Most common in those aged <50 yConsider AP pelvis as initial examination as condition may be bilateral
• M:F = 8:1; in younger patients, M:F = 4.2:1
• Progressive groin pain that may refer to the kneeSpecial investigations [B]
• Early stages: normal ROMMRI useful when radiographs are normal, especially in high-risk patients; also NM and CT (when MRI unavailable)
• Advanced stages: limitation of extension, internal rotation and abduction; limping and atrophy.
5. Tumors and metastatic lesionsRadiographs indicated [D]
No specific clinical features; spontaneous pathologic fracture is often first sign of metastasis from breast, lung, or prostate cancer.AP spot and AP frog leg views
Special investigations [D]
NM, CT, MRI
6. Stress (fatigue or insufficiency) fracturesRadiographs indicated [D]
Exertional anterior hip pain, especially after an increase in training regimen. Chronic repetitive overloads, typically in athletes or reduced mechanical bone properties (athletic amenorrhea, osteoporosis, corticosteroid use)AP spot and AP frog leg views
If radiograph is inconclusive, re-radiograph after 10-14 d of restricted use before going to advanced imaging
Special investigations [D]
Bone scan, MRI, or CT in suspected occult, osteoporotic, or stress fractures
Patient Presentation
Adult patients with significant hip traumaRadiographs indicated [B]
Delay in recognition and reduction of acute dislocations, fractures, and fracture-dislocation of hip leads to preventable complications and morbidity (LOE III).
AP pelvis, AP centered of hip, right and left obliques of the pelvis, and true lateral views
Special investigations [B]
MRI for patients with significant hip pain after injury, especially when unable to bear weight; also to exclude occult fracture and possible labral tear

Table 2. Summary of recommendations—adult knee disorders

Patient presentationRecommendations
Adult patients with nontraumatic knee pain of <4 wk of durationRadiographs not initially indicated [C]
• Symptoms frequently arise from soft tissues not seen on radiographs
• Physical examination should include lower back, pelvis, hip, foot, and ankle as pain may be referred
General indications for knee radiographs include:When radiographs are indicated or unless otherwise specified [D]
• History of noninvestigated trauma (with signs from the OKR—see below)• Standing AP views for joint space integrity
• Complex history• Consider recumbent AP views if osseous detail is important
• Significant unexplained effusion with no previous films• Lateral view
• Loss of mobility in undiagnosed condition.• Tunnel (intercondylar) view
• Acute/subacute onsetSpecial investigations [C]
• Intermittent locking• US useful to visualize superficial soft tissue structures (tendons, collateral ligament bursae)
• Unrelieved by 4 wk of conservative care• MRI best for internal derangements and can often prevent unnecessary knee arthroscopy
• Palpable enlarging mass
Specific clinical diagnoses
1. OARadiographs indicated if unrelieved by 4 wk of conservative care [B]
The clinical criteria for OA of the knee are:AP, lateral, and intercondylar views if radiographs are indicated
History:Additional views: 45° (oblique) views if signs and symptoms do not correlate with standard views
• Age> 50 ySpecial investigations [C]
• Morning joint stiffness < 30 minUS or MRI indicated if significant effusion and/or loss of joint space
Physical examination:
• Crepitation
• Bony tenderness
• Bony enlargement
• No palpable warmth
Other characteristics include: long-standing pain, no extra-articular symptoms; aggravated by weight bearing, climbing stairs, exercise; nonresponsive to NSAID or corticosteroid medication; relieved with rest; deformity or fixed contracture, joint effusion; insidious onset.
2. Inflammatory arthritis (seronegative and seropositive)Radiographs indicated [D]
Diagnosis of inflammatory arthritis of the knee is primarily based on history and physical examination:Consider bilateral AP standing views
• Unrelenting morning stiffness< 30 min
• Pain at restSpecial investigations [C]
• Pain or stiffness better with light activity (during remission)• US and MRI may aid in staging and as indicator of disease progression
• Polyarticular involvement, especially the hands• Knee aspiration if positive for effusion
• Palpable warmth
• Joint effusion
• Decreased ROM
• Fever/chills or other systemic symptoms
• Responsive to NSAID or corticosteroid medication
• Flexion and adduction contracture in long-standing arthritis
• See also hip section for RA diagnostic criteria
3. Bursitis/tendinitis/strain/tendinosisRadiographs not routinely indicated unless [D]
Clinical features:• Unrelieved by 4 wk of conservative care
• Related to or aggravated by activity• Suspected avulsion fracture
• Relieved or diminished symptoms at rest• Underlying arthropathy
• Point tendernessSpecial investigations [D]
• Localized swelling (extra-articular)• MRI
• Puncture of a popliteal cyst and corticosteroid injection can be done under US guidance.
4. Anterior knee painRadiographs indicated if [C]
Clinical features:• Unrelieved by 4 wk of conservative care
• Insidious onset• Suspected fracture
• Aggravated with steps/incline/rising from chair• Underlying arthropathy
• Stiffness with rest or glidingAdditional views:
• Pseudolocking or giving way• Tangential patellar views to evaluate for chondromalacia, patellar tilt or subluxation
• Tender patellar facets• Stress radiographs to evaluate for patellofemoral instability (stress view: valgus and internal rotation at 45° of knee flexion)91
• Positive apprehension testsSpecial investigations [C]
• Crepitation• High-field MRI for chondromalacia and synovial plicae
• Abnormal Q angle• Contrast CT arthrography if MRI unavailable
Clinical tests for the diagnosis of chondromalacia patella have low sensitivity, specificity, predictive values, and accuracy compared with tests for arthroscopy.
5. Internal joint derangementRadiographs indicated if unrelieved by 4 wk of conservative care [B]
Clinical features:Standard AP, lateral views if necessary after 4 wk
HistoryAdditional views: tunnel, standing lateral, standing oblique
• Acute or subacute onsetSpecial investigations [C]
• Mechanism of injuryIf diagnosis not well established from Hx, examination and radiographs or in the absence of clinical improvement
• Intermittent locking and/or giving way• MRI is gold standard for internal knee derangements such as meniscal and ligamentous injuries
• Crepitation, snapping, and popping• Spiral CT arthrography if MRI unavailable
• Worse with activity
• Improved with rest
(The accuracy of the clinical history in patients with suspected torn ligament or meniscus is unknown.)
Physical examination:
• Joint line tenderness
• Swelling and joint effusion
• Loss of ROM
Meniscal tear: joint line tenderness, McMuray, and Ege's test (weight-bearing McMurray test)
Ligamentous tear: Lachman maneuver, pivot test, and the Anterior Drawer Test
Patient presentationRecommendations
Adult with acute knee injury but negative findings for the OKR indicates that a fracture is very unlikely.Radiographs not routinely indicated [B]
Consider radiographs only of patients excluded from the OKR:Patient should be advised to return for follow-up if their pain has not improved in 7 d
• <18 YOA
• Pregnancy
• Isolated skin injury
• Referred with outside films
• 7 d since injury
• Multiple injuries
• Altered level of consciousness
• Paraplegic
Adult with acute knee injury and positive findings for the OKR
Radiographs indicated in the presence of one or more of the OKR criteria [A]
Radiographs required only in the presence of postinjury knee pain and any one of the following findings:AP supine and lateral views
• ≥55 YOAAdditional views: bilateral obliques, tunnel, and tangential views
• Isolated tenderness at the head of the fibula or patellaSpecial investigations [C]
• Inability to flex knee >90°• Valgus stress radiographs under general anesthesia
• Inability to walk 4 weight-bearing steps both immediately and at presentation• MRI is the modality of choice for initial investigation of knee trauma.
Radiographs should also be obtained in the presence of obvious deformity or mass.• CT, US, and angiogram may be needed for additional information.

Table 3. Summary of recommendations—adult ankle and foot disorders

Patient presentationRecommendations
Adult with acute ankle and foot injury but negative findings on the OARRadiographs not routinely indicated [B]
Consider radiographs only of patients excluded from the OAR:
• Multiple injuries
• Isolated skin injury
• 10 d since injury
• Obvious deformity of ankle or foot
• Altered sensorium: cognitive or sensory impairment (neurologic deficit), head trauma, intoxicated
Adult with acute ankle and foot injury and positive findings on the OARAnkle radiographs indicated [B] AP ankle, 20° medial oblique (mortise views) and lateral (include base of fifth metatarsal)
(a) Ankle (positive OAR)Additional views: Stress radiographs after fibular fracture helpful pre-operatively to determine deltoid ligament status in orthopedic setting.
Radiographs required only if there is pain in the malleolar zone and any of these findings:Special investigations [D]
• Bone tenderness of distal fibula along posterior edge or tip of lateral malleolus (distal 6cm)• MRI or CT appropriate in presence of significant pain and disability and negative radiographs
• Bone tenderness of distal tibia along posterior edge or tip of medial malleolus (distal 6 cm)• Fluoroscopic stress examination under anesthesia to assess ankle instability
• Inability to bear weight both immediately and in clinic• NM for persisting symptoms to exclude stress fracture
Also consider taking ankle radiographs in:
• Older patients with malleolar tenderness and pronounced soft tissue edema.
• Presence of positive OAR foot findings
(b) Foot (positive OAR)Foot radiographs indicated [B]
Radiograph required only if there is pain in the midfoot zone and any of these findings:When feasible, weight-bearing foot AP, lateral, medial oblique views
• Bone tenderness of base of fifth metatarsalComparison views (normal foot) may be helpful.
• Bone tenderness of navicular boneAdditional view: tangential view of calcaneus for heel trauma cases
• Unable to bear weight both immediately and in clinic
Adult with acute toe injuryRadiographs indicated: AP, oblique, and lateral views limited to the toes
Consider obtaining foot radiographs in presence of significant metatarsal pain (see OAR-Foot)
Adult with chronic ankle and tarsal painRadiographs indicated [C]
Specific indications for radiographs include:AP ankle, lateral, medial oblique (mortise) views
• Suspected osteochondral lesion/stress fracture(Medial oblique view helps evaluate the talocalcaneal relationship and lateral malleolus.)
• Suspected tendinopathy with possible inflammatory arthritisAdditional view: Stress radiographs may be considered, but little agreement exists as to which technique.
• Possible ankle instability. Single-leg jump test as clinical indicator of functional instabilitySpecial investigations [D]
• Noninvestigated chronic ankle and tarsal painMRI is the gold standard for musculoskeletal assessment if radiography is positive or if unrelieved by 4 wk of conservative care.
• Multiple sites of degenerative joint disease as visualized on radiographs• Contrast-enhanced, fat-suppressed, 3D, fast-gradient MRI may be useful in diagnosing synovitis and soft tissue impingement.
• Possible operative candidateSpecific clinical diagnoses
1. Impingement syndromesRadiographs indicated [D]
Findings most strongly associated with abnormality at arthroscopy:AP ankle, lateral and mortise views
• Anterolateral tendernessSpecial investigations [D]
• SwellingFor all suspected impingement syndromes with positive radiographs or unrelieved by 4 wk of conservative care:
• Pain on single-leg squatting• Contrast-enhanced, fat-suppressed, 3D, fast-gradient MRI may be indicated depending on pain severity and disability.
• Pain on ankle dorsiflexion and eversion
(a) Anterolateral impingementRadiographs indicated [D]
Clinical features:AP, lateral, and mortise ankle views
• Mechanism: inversion injuryAdditional view: [D]
• Pain and localized tenderness in region of anteroinferior tibiofibular and/or anterior talofibular ligamentStress radiographs may be considered.
• Positive impingement sign
(b) Anterior impingementRadiographs indicated [D]
Clinical features:AP, lateral, and mortise ankle views
• Mechanism: supination or repeated dorsiflexion injury
• Anterior pain
• Painful and restricted dorsiflexion
(c) Anteromedial impingementRadiographs indicated [D]
Clinical features:AP, lateral, and mortise ankle views
• Mechanism: inversion injury or ankle/talar fracture
• Anteromedial pain and tenderness
• Swelling
• Pain and restriction on dorsiflexion and supination
(d) Posterior impingementRadiographs indicated [D]
Clinical features:AP, lateral, and mortise ankle views
• Mechanism: impingement of os trigonum between talus and posterior tibia
• Common in ballet dancersSpecial investigations [D]
• Pain elicited with full weight-bearing in maximum plantar flexion, especially when os trigonum is present.MRI for os trigonum syndrome
• Tenderness behind lateral malleolus• Pain with passive plantar flexion
2. Peroneal tendinosisRadiographs not routinely indicated [D]
Clinical features:Unless unrelieved by 4 wk of conservative care or patient has a suspected inflammatory arthritis
• Lateral hindfoot pain
• Cavovalgus foot deformitySpecial investigations [D]
• Frequently affected in RAMRI or US if there are signs of popping or clicking with foot eversion
3. Lateral premalleolar bursitisRadiographs not routinely indicated [GPP]
Clinical features:Special investigations [GPP]
• Adventitious bursa develops in people sitting with inverted and plantar flexed feetUS if unrelieved by 4 wk of conservative care
4. Tarsal tunnel syndromeRadiographs not routinely indicated [D]
Clinical features:
• Tingling pain and burning over the sole of the foot after prolonged standing or walkingSpecial investigations [D]
• Worse at night in some• US or MRI for nerve and other soft tissue visualization
• Positive Tinel sign• CT for bony abnormalities
• Positive nerve compression test• Sensory conduction velocity and distal motor latency useful for diagnosis and treatment progression
• 2-Point discrimination
• Hypoesthesia on sole of foot
• Rare weakness of toe flexion
Adult with chronic foot painRadiographs generally indicated [D]
Non–weight-bearing AP, lateral, medial, and lateral oblique views
Additional views:
• Lateral views for toes
• Axial and lateromedial tangential views for sesamoid bones
Special investigations [D]
• NM, MRI, US, arthrography may be useful
• Laboratory investigations (blood and synovial fluid) recommended
A. Hindfoot-Heel painRadiographs indicated [D]
AP, lateral, and medial oblique views of the foot
Additional views: tangential view of the calcaneus and lateral calcaneus view
Special investigations [D]
• MRI if unrelieved by 4 wk of conservative care or before referral for medical care or to podiatrist
• Achilles enthesopathy: power Doppler sonography may show neovascularization, which may be the cause of pain.
Specific clinical diagnoses
A1. PF and calcaneal enthesosphyte (spur)Radiographs not routinely indicated except in young athlete [B]
Clinical features:AP, lateral, and oblique views
• PF is one of the most common soft tissue foot disorders
• Hyperesthesia over the plantar fasciaSpecial investigations [D]
• Risk factors:• US may be initial step for advanced imaging (readily available, highly sensitive, low-cost, and radiation-free).
 ○Decreased ankle dorsiflexion (≤0°)• Doppler/power US improves US value
 ○Being on their feet most of working day• US, MRI, and bone scan are more sensitive in showing inflammatory changes and thickening of the plantar aponeurosis in PF
 ○Obesity (body mass index >30 kg/m2)
A2. Sinus tarsi syndromeRadiographs not initially indicated [D]
Clinical features:
• Mechanism: inversion injury or inflammatory joint diseasesSpecial investigations [D]
• Lateral foot painMRI if unrelieved by 4 wk of conservative care: may be helpful for detecting subtle unilateral deformities
• Perceived foot instability
• Tenderness of the sinus tarsi
B. Midfoot pain (nontraumatic)Radiographs indicated if unrelieved by 4 wk of conservative care or in suspected inflammatory arthritis [D] AP, medial oblique, and lateral views of the foot
Midfoot pain usually self-limiting.
Differential diagnosis:Additional views: weight-bearing ankle series may be useful
• RA
• Psoriatic arthritisSpecial investigations if radiography is positive or if unrelieved by 4 wk of conservative care [GPP]
• Reactive arthritis (Reiter disease)CT or MRI warranted in suspected or proven disease, but negative/equivocal radiographs
• Gout
• Diabetic neuroarthropathy/Charcot joints
• Diabetic infection
Specific clinical diagnoses
B1. Acquired flat foot with posterior tibial tendon dysfunction/ruptureRadiographs indicated if unrelieved by 4 wk of conservative care or in suspected inflammatory arthritis [D] AP, medial oblique, and lateral foot radiographs
Clinical features:Additional views: weight-bearing ankle series may be useful
• Medial ankle/foot pain initiallySpecial investigations [D]
• May lead to disabling weight bearing symptoms• MRI better at differential diagnosis of medial ankle/foot pain
• Talonavicular subluxation• US may be useful
• Difficulty or inability to perform single-limb heel rise
• Weak resisted inversion of fully flexed foot
B2. Navicular tuberosity pain and tenderness148Radiographs indicated if unrelieved by 4 wk of conservative care [C]
Potential painful normal variants such as accessory navicular bone (4%-21% of the population) have been described.AP, medial oblique, and lateral foot views
Painful fibro-osseous junction of the accessory boneSpecial investigations [GPP]
• MRI to differentiate accessory navicular from an avulsion fracture
• NM may be useful to help identify or confirm site of pain.
B3. Complex regional pain syndromeRadiographs indicated [D]
Synonyms:AP, lateral, and medial oblique views of the foot
• Reflex sympathetic dystrophySpecial investigations [D]
• Sudek's atrophy• MRI is useful in detecting numerous soft tissue and earlier bone and joint processes that are not depicted or as well characterized with other imaging modalities
Clinical features:• 3-Phase NM scan recommended if radiograph is not diagnostic
• Pain
• Tenderness
• Swelling
• Diminished motor function
• Vasomotor and sudomotor instability
Specific clinical diagnoses
C. Forefoot painRadiographs not routinely indicated unless unresponsive to 4 wk of conservative care or if inflammatory or infectious etiology suspected [B]
See recommendations for the following specific clinical diagnoses:AP and lateral foot views
C1. Metatarsal bursitisSpecial investigations [D]
C2. Morton neuromaMRI useful in differential diagnosis of forefoot pain such as stress fracture, metatarsophalangeal synovitis, and intermetatarsal bursitis
C3. Stress fracture
C4. Avascular necrosis (osteonecrosis)
C5. Hallux rigidus and hallux valgus
C6. Sesamoiditis
C1. Metatarsal bursitisRadiographs not routinely indicated unless unresponsive to 4 wk of conservative care, or if inflammatory or infectious etiology suspected [GPP]
AP and lateral foot views
Special investigations [GPP]
MRI useful in differential diagnosis of forefoot pain
C2. Morton neuromaRadiographs indicated [C]
Clinical features:AP, lateral, with or without oblique
• Most commonly found in the 3-4 web spaceSpecial investigations [D]
• Pain hyperesthesia or paresthesia radiation to the toesMRI
• Differential diagnosis from MTP arthritis may be difficult
• Positive forefoot neuroma squeeze test
C3. Stress (fatigue or insufficiency) fractureRadiographs indicated [D]
Clinical features:AP and lateral foot views with or without medial oblique specific to the area of complaint
Pain and tenderness present in the:Special investigations [D]
• Second and third metatarsal• High-field MRI with fat suppression or IR protocol. As sensitive as NM
• calcaneus• CT still uncertain; some centers use US
• First metatarsal
• medial sesamoid
• Navicular
C4. Osteonecrosis (avascular necrosis)Radiographs indicated [C]
Clinical features:AP, lateral, with or without medial oblique of the foot
• Adolescent patientSpecial investigations [D]
• PainMRI modality of choice to evaluate bone marrow changes in early stages
• Tenderness
• Swelling
• Limitation of movement at metatarsal head
• Second or third head most commonly affected
C5. Hallux rigidus and hallux valgus (first MTP joint)Radiographs not routinely indicated unless unresponsive to 4 wk of conservative care [D]
Lateral view most useful for dorsal osteophyte on the metatarsal head and possible osseous fragments
Additional view: Weight-bearing series to quantify degree of valgus deformity
C6. SesamoiditisRadiographs not routinely indicated unless unresponsive to 4 wk of conservative care [D]
Painful inflammatory condition caused by repetitive injury; reactive tendinitis, synovitis, or bursitis commonAdditional view: lateromedial tangential views for sesamoid bones
Special investigations [GPP]
MRI to differentiate from turf toe

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Appendix C. General Indications for Advanced Imaging in Extremity Disorders 

IndicationsMRICTNMUS
Evaluation of neoplasm detected on conventional radiographs+++
Determining skeletal distribution of neoplasms or other multifocal skeletal disease ++
Internal joint derangements+++ +
Inflammatory arthritis+++++
Evaluation of soft tissue injury, tendon pathology, calcified bursitis++ +
Osteomyelitis+++++
Fluid collections or infections in joints or extra-articular soft tissues; unexplained soft tissue mass++ ++
Osteonecrosis++++
Complicated fractures+++
Suspected stress, occult fracture++++
Complicated disease processes or findings unexplained by more conservative tests++

++, First choice; +, second choice (must be determined on a case-by-case basis)a,b,c

aAdapted with permission from Peterson C. Canadian Guidelines for Imaging (2002, unpublished data).

bSantiago RC, Gimenez CR, McCarthy K. Imaging of osteomyelitis and musculoskeletal soft tissue infections: current concepts. Rheum Dis Clin North Am 2003;29(1):89-109.

cCardinal E, Bureau NJ, Aubin B, Chhem RK. Role of ultrasound in musculoskeletal infections. Radiol Clin North Am. 2001;39(2):191-201.

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Appendix D. Typical Effective Ionized Radiation Dose for Common Imaging Procedures* 

ClassTypical effective dose (mSv)Examples
00Ultrasound, magnetic resonance imaging
I<1Radiograph: cervical and thoracic spine, extremities, pelvis, and lungs
II1-5Lumbar spine radiograph, Nuclear medicine, cervical spine CT
III5-10Chest and abdomen CT

*Classification of the typical effective dose of ionizing radiation from common imaging procedures. Adapted from European Commission. Radiation protection 118. Referral guidelines for imaging in conjunction with the UK Royal College of Radiologists; Italy 2001. p 21.

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Appendix E. Additional Reading Recommended on MRI 

• Grenier JM, Wessely MA. Hip and pelvis MRI. Part 1: A basic overview. Clin Chiropr 2006; 9:92-8.

• Grenier JM, Wessely MA. Hip and pelvis MRI. Part 2: Common pathological conditions of the pelvis and hip. Clin Chiropr 2006;9:150-159.

• Grenier JM, Green NA, Wessely MA. Knee MRI. Part I: basic overview. Clin Chiropr 2004; 7:84-9

• Grenier JM, Wessely MA. Knee MRI. Part II: MR imaging of common internal derangement affecting the knee. Clin Chiropr 2004; 7:131-40.

• Wessely MA. MR imaging of the ankle and foot—a review of normal imaging appearance with an illustration of common disorders. Clin Chiropr 2007; 10:101-11.

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Appendix F. Acknowledgements 

The authors express their sincere appreciation to all Delphi panelists (phase 5), external reviewers (phases 4 and 7), and to the quality of literature assessors (phase 2): Jeffrey Cooley, Jonathon Egan, Michael Morgan, Julie O'Shaughnessy, and Jason Napuli, whose significant contributions were essential in the completion of this project. The authors are grateful to chiropractic college presidents for recommending faculty members for the Delphi panel. The authors have appreciated the feedback received by colleagues in the field during and after the worldwide consultation on the Web (phase 6). Many thanks to Dr Andre Cardin of Université du Québec à Trois-Rivières for his significant input in the initial draft (phase 3); Drs Michelle Wessely of the Institut Franco-Europeen de Chiropratique and Julie-Marthe Grenier of Université du Québec à Trois-Rivières for their valuable editorial input; and to Drs Carlo Ammendolia, DC, PhD, Joe Lemire DC, MSc, John Triano, DC, PhD, and Jacques Duranceau, MD, for providing constructive advice. The authors are indebted to those who assisted during all or part of the project, including Drs Mark Laudadio, DC; Christian Eid, DC; Julie Roy, DC; Nicholas Beaudoin; and Mme Valérie Lambert, academic and technology support, Computer System Development Division at UQTR. Finally, the authors would like to thank Mrs Vicki Pennick, RN, BScN, MHSc, Senior Clinical Research Project Manager, Managing Editor, Cochrane Back Review Group, Institute for Work and Health, for her valuable advice and pertinent comments and suggestions as a public representative.

The authors acknowledge all Delphi panelists who have dedicated their time to this project. The following is a list of Delphi panelists who have agreed to be acknowledged for their significant contribution to the research project.

Allan Adams, DC, MSEd

Texas, USA, Texas Chiropractic College (Academic and Researcher)

Peter Aker, DC, MSc, FCCS, FCCRS

Ontario, Canada (Clinician and Researcher)

Thomas F. Bergmann, DC

Minnesota, USA, Professor, Northwestern Health Sciences University (Academic, Clinician)

Douglas G. Brandvold, DC

British Columbia, Canada (Clinician)

Peter Bull, DC, MAppSc, FICC

Sydney, Australia, Senior Lecturer, Director of Postgraduate Studies, Macquarie University (Academic and Clinician)

Jeanmarie Burke, PhD

New York, USA, Research Director, New York Chiropractic College (Researcher and Academic)

David Byfield, BSc Hons, DC, MPhil, FCC, FRSM, FBCA

Wales, UK, Divisional Head—Chiropractic,

Head of the Welsh Institute of Chiropractic Faculty of Health, Sport and Science

University of Glamorgan (Academic and Clinician)

Jeffrey Cooley, DC, DACBR

Perth, West Australia, Senior Lecturer, Murdoch University (Academic)

Vince DeBono, DC

Illinois, USA, Dean of Clinics, National University of Health Sciences (Academic, Clinician)

Martin Descarreaux, DC PhD

Quebec, Canada, Université du Québec à Trois-Rivières (Researcher, Academic and Clinician)

Renee DeVries, DC, DACBR

Minnesota, USA, Associate Professor and Consulting Radiologist, Northwestern Health Sciences University (Academic)

Shawn Dill, DC

California, USA, Professor, Life College Chiropractic West (Academic and Clinician)

Paul Dougherty, DC, FACO

New York, USA, New York Chiropractic College (Academic)

Dennis Enix, DC, MBAc

Missouri, USA, Associate Professor of Research, Logan College of Chiropractic (Researcher and Clinician)

Ronald C. Evans, DC, FACO, FICC

Iowa, USA, Senior Orthopedist, Senior Trustee, Foundation for Chiropractic Education and Research, Senior Member, Chiropractic Healthcare Benefits Advisory Committee, Health Affairs, Department of Defense (Researcher and Clinician)

Roni Evans, DC, MSc

Minnesota, USA, Dean of Research, North Western Health Sciences University (Researcher)

Simon Forster, DC DACBO

Texas, USA (Clinician)

Edward Fritsch, DC

Texas, USA, Texas Chiropractic College (Academic and Clinician)

Bryan Gatterman, DC, DACBR

California, USA, Life West Chiropractic College (Academic and Clinician)

Claude Gauthier, DC

Quebec, Canada (Clinician)

Guy Gosselin, DC, FCC (UK)

London, UK (Clinician)

Kristin L. Grace, DC DACBR

Hastings, New Zealand, Senior Lecturer, New Zealand Chiropractic College (Academic and clinician)

Gary Greenstein, DC

Connecticut, USA, University of Bridgeport (Academic)

Julie-Marthe Grenier, DC, DACBR

Quebec, Canada, Université du Québec à Trois-Rivières (Academic, Research)

Rocco Guerriero, C. BSc, DC, FCCSS(C), FCCRS(C), FCC(C)

Ontario, Canada, Canadian Memorial Chiropractic College (Academic and Clinician)

Mitchell Haas, DC, MA

Oregon, USA, Dean of Research, Western States Chiropractic College (Academic and Researcher)

Michael W. Hall, DC, DABCN

Texas, USA, Associate Professor, Parker College of Chiropractic (Academic and Clinician)

Jan Hartvigsen, DC, PhD

Odense, Denmark, Dean of Research, University of Southern Denmark (Academic and Researcher)

Shawn Henderson, DC, FCCRS(C), FCCO(C)

Ontario, Canada (Clinician)

William Hsu, DC, DACBR

Ontario, Canada, Associate Professor, Canadian Memorial Chiropractic College (Academic)

Eric Jackson, DC FCCRS

Ontario, Canada (Clinician)

Amanda Kimpton, BAppSc(Chiro), PhD

Victoria, Australia, RMIT University (Academic and Clinician)

Dana J. Lawrence, DC, FICC

Iowa, USA, Associate Professor

Palmer Chiropractic College (Academic and Researcher)

Douglas Lawson, BA, DC

Alberta, Canada (Researcher and Clinician)

Kathleen Linaker, DC, DACBR, Assistant

Georgia, USA, Professor, Director Clinic Radiology, Life University College of Chiropractic (Academic, Clinician)

Tracey Littrell, DC, DACBR

Iowa, USA, Associate Professor, Diagnosis and Radiology, Palmer-Davenport Chiropractic College (Academic)

Stephan Mayer, BSc, DC

California, USA, Chair of Diagnostic Sciences and Associate Academic Dean, Cleveland Chiropractic College (Academic)

Peter W. McCarthy, BSc (Jt Hons), PhD FBCA

Wales, UK, University of Glamorgan (Researcher and Academic)

Ian D. McLean, DC, DACBR

Iowa, USA, Professor, Clinical Radiologist Professor, Director of Clinical Radiology and Chiropractic Residencies, Palmer-Davenport Chiropractic College (Academic and Clinician)

Michael Mestan, DC, DACBR

New York, USA, Head of Department of Chiropractic Clinical Sciences, New York Chiropractic College (Academic)

Timothy J. Mick, DC, DACBR, FICC

Minnesota, USA, Associate Professor

Director—Radiological Consultation Services, Northwestern Health Sciences University (Academic)

Silvano Mior, DC, FCCS

Ontario, Canada, Canadian Memorial Chiropractic College (Researcher and Clinician)

Tom Molyneux, DipAppsc (H Biology), DipAppSc(Chiro), BAppSc(Chiro), DACBR, FACCR, GradDipTertEd

Victoria, Australia, RMIT University (Academic)

William E. Morgan, DC

Maryland, USA, Adjunct professor, New York College of Chiropractic, National University of Health Sciences (Clinician)

Elli Morton, DC

British Columbia, Canada (Clinician)

Greg Norton, DC, FACO, FIACN

Iowa, USA (Clinician)

Sandra O'Connor, DC, DACBR, FCCR

Ontario, Canada (Clinician)

Rosemary Pace, RN, DipAppSc(MedRad), MEd (ICT), MBus, GradDipEd, GradDipBus

Victoria, Australia, RMIT University (Academic and Researcher)

Joseph Pfeifer, DC

New York, USA, New York Chiropractic College (Academic)

John Pikula, FCCR(C), FCCS(C), FCCO(C)

Ontario, Canada (Clinician)

Brock Potter, DC

British Columbia, Canada (Clinician)

Tania C. Pringle, BPE, BA, DC, DACBR, FCCR(C)

Ontario, Canada, Assistant Professor, Canadian Memorial Chiropractic College (Academic)

Serge Roux, DC, DABCO

Quebec, Canada (Clinician)

Peter Scordilis, DC

New Jersey, USA (Clinician)

Thomas A Souza, DC, DACBSP

California, USA, Dean of Academic Affairs, Palmer Chiropractic College West (Academic and Clinician)

John Stites, DC, DACBR

Iowa, USA, Palmer Chiropractic College (Academic)

Rand Swenson, DC, MD, PhD

New Hampshire, USA, Associate Professor of Anatomy and of Medicine, Chairman, Department of Anatomy, Dartmouth Medical School (Academic, Clinician)

John Sweaney, AM, DC

New South Wales, Australia, Chiropractic Education Consultant (Clinician)

Cliff Tao, DC, DACBR

California, USA (Clinician)

Jeffrey Thompson, DC, DACBR

Texas, USA (Clinician and Researcher)

Jann Thulien, DC, DACBR

Ontario, Canada (Clinician)

Michelle A. Wessely, BSc, DC, DACBR

Paris, France, Professor, Head of Radiology and Clinical Research, Institut Franco‑Europeen de Chiropratique (Academic and Clinician)

Michael Whitehead, BS, DC, DACBR

Missouri, USA, Chair of Diagnostic Sciences, Cleveland Chiropractic College (Academic and Clinician)

Kenneth J. Young, DC, DACBR, FCC(UK)

Wales, UK, Senior lecturer in radiology, University of Glamorgan (Academic and Clinician)

Delphi Process Advisors

Meridel I Gatterman, MA, DC, MEd,

Colorado, USA, Chiropractic Educational Consultant

Peter Miller, BSc, MSc, FCC (Orth)

Bournemouth, UK, Anglo‑European College of Chiropractic

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PII: S0161-4754(07)00305-3

doi:10.1016/j.jmpt.2007.10.004

Journal of Manipulative and Physiological Therapeutics
Volume 30, Issue 9 , Pages 684-717, November 2007