Štěpán Magersky1, Adam Král2, Radovan Kubeš2. 1. Department of Orthopaedics, 1st Faculty of Medicine, Charles University and Na Bulovce Hospital, Budínova 2, 180 81, Prague 8, Czech Republic. smagersky@gmail.com. 2. Department of Orthopaedics, 1st Faculty of Medicine, Charles University and Na Bulovce Hospital, Budínova 2, 180 81, Prague 8, Czech Republic.
Abstract
PURPOSE: The purpose of this study was to determine whether X-ray attributes of the femoro-acetabular impingement (FAI) - alpha angle (AA) and offset ratio (OR) reflect real measurements on resected femoral heads. METHODS: FAI AA and OR were assessed on 50 consecutively-resected femoral heads. The parameters were measured on heads cut through the maximum range of the deformity and compared to the same parameters on standardized X-ray projections (anterior-posterior [AP] and axial views). RESULTS: Mean AA was 76.47° on dissected heads vs. 75.81° on axial X-ray (p = 0.688). Mean OR was 0.132 on dissected heads vs. 0.220 on axial X-ray (p < 0.001). Mean AA on ideal AP X-ray was 79.46° vs. 81.51° on AP standing plain X-ray view (p = 0.431). AA measurements on plain X-ray AP and axial view of halved femoral heads correlated highly. CONCLUSIONS: AA on axial X-ray view reflected the real AA in our series, but the risk of cartilage damage cannot be predicted.
PURPOSE: The purpose of this study was to determine whether X-ray attributes of the femoro-acetabular impingement (FAI) - alpha angle (AA) and offset ratio (OR) reflect real measurements on resected femoral heads. METHODS: FAI AA and OR were assessed on 50 consecutively-resected femoral heads. The parameters were measured on heads cut through the maximum range of the deformity and compared to the same parameters on standardized X-ray projections (anterior-posterior [AP] and axial views). RESULTS: Mean AA was 76.47° on dissected heads vs. 75.81° on axial X-ray (p = 0.688). Mean OR was 0.132 on dissected heads vs. 0.220 on axial X-ray (p < 0.001). Mean AA on ideal AP X-ray was 79.46° vs. 81.51° on AP standing plain X-ray view (p = 0.431). AA measurements on plain X-ray AP and axial view of halved femoral heads correlated highly. CONCLUSIONS: AA on axial X-ray view reflected the real AA in our series, but the risk of cartilage damage cannot be predicted.
Entities:
Keywords:
Alpha angle; Anatomic study; FAI; Hip; Offset ratio
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