Document Detail

The frog-leg lateral radiograph accurately visualized hip cam impingement abnormalities.
MedLine Citation:
PMID:  17589367     Owner:  NLM     Status:  MEDLINE    
Radiographic evaluation of the anterolateral femoral head-neck junction is essential in diagnosing cam femoroacetabular impingement. We hypothesized the frog-leg lateral radiograph can accurately assess femoral head-neck offset abnormalities associated with cam femoroacetabular impingement. We reviewed the radiographs of 61 hips treated for cam impingement and 24 asymptomatic control hips. To characterize the anatomy of the femoral head-neck junction, the femoral head sphericity, the alpha-angle of Nötzli et al, and head-neck offset were measured on all radiographs. Asphericity of the femoral head was detected more frequently in hips with impingement on all radiographic views when compared with control hips. The average alpha-angle was greater in hips with impingement on all views, with the greatest difference between hips with impingement and control hips seen on the frog-leg lateral view (65 degrees for hips with impingement versus 47 degrees for control hips). The average head-neck offset was decreased in hips with impingement on all views. The greatest difference between groups was seen on the frog-leg lateral view (6.6 mm for hips with impingement versus 9.3 mm for control hips). The frog-leg lateral radiograph provides accurate visualization of the femoral head-neck offset in patients being evaluated for femoroacetabular impingement.
John C Clohisy; Ryan M Nunley; Robert J Otto; Perry L Schoenecker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical orthopaedics and related research     Volume:  462     ISSN:  0009-921X     ISO Abbreviation:  Clin. Orthop. Relat. Res.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-10-16     Completed Date:  2007-11-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0075674     Medline TA:  Clin Orthop Relat Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  115-21     Citation Subset:  AIM; IM    
Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, MO 63110, USA.
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MeSH Terms
Acetabulum / radiography*
Arthrography / methods*
Femur Head / radiography*
Femur Neck / radiography*
Hip Dislocation / radiography*
Middle Aged
Observer Variation
Reproducibility of Results
Retrospective Studies

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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