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A method of assessing the severity of cam type femoro-acetabular impingement in three dimensions

Femoroacetabular impingement is caused by abnormal morphology of either the femur or acetabulum or both. Diagnostic criteria currently include an alpha angle of over 50° on a lateral radiograph. In this study, CT scans of symptomatic hips (n = 37) were compared with normal hips (n = 34) obtained fro...

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Bibliographic Details
Published in:Hip international 2012-11, Vol.22 (6), p.677-682
Main Authors: Masjedi, Milad, Azimi, David Y, Nightingale, Craig L, Harris, Simon J, Cobb, Justin P
Format: Article
Language:English
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Summary:Femoroacetabular impingement is caused by abnormal morphology of either the femur or acetabulum or both. Diagnostic criteria currently include an alpha angle of over 50° on a lateral radiograph. In this study, CT scans of symptomatic hips (n = 37) were compared with normal hips (n = 34) obtained from CT colonoscopy procedures. The femoral head described in terms of a three dimensional (3D) alpha angle and a 3D head neck margin (epiphysis) angle '3Dμ' using a semi-automated algorithm. In normal hips 70% have a maximum 3Dα angle of more than 50° at some point around their femoral head (mean 53° ± 5°, range 42° - 64°), while in cam hips, it was significantly larger (mean 69° ± 10°, range 54° - 94°, p
ISSN:1120-7000
1724-6067
DOI:10.5301/HIP.2012.9900