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International Orthopaedics

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01-01-2018 | Original Paper

Femoro-acetabular impingement: anatomic study of reliability and accuracy of alpha angle and offset ratio on fifty consecutive peri-operatively resected femoral heads

Authors: Štěpán Magersky, Adam Král, Radovan Kubeš

Published in: International Orthopaedics | Issue 1/2018

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.

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Title: Femoro-acetabular impingement: anatomic study of reliability and accuracy of alpha angle and offset ratio on fifty consecutive peri-operatively resected femoral heads
Authors: Štěpán Magersky
Adam Král
Radovan Kubeš
Publication date: 01-01-2018
Publisher: Springer Berlin Heidelberg
Published in: International Orthopaedics / Issue 1/2018
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-017-3572-5

ACC 2024 Congress

Springer Medicine

Femoro-acetabular impingement: anatomic study of reliability and accuracy of alpha angle and offset ratio on fifty consecutive peri-operatively resected femoral heads

Abstract

Purpose

Methods

Results

Conclusions

ACC 2024 Congress

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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