Hip Flexion After Birmingham Hip Resurfacing:
Role of Cup Anteversion, Anterior Femoral Head-Neck Offset, and Head-Neck Ratio
Abstract
We aimed to investigate the factors affecting range of flexion after hip resurfacing. A total of 82 cases, operated by a single surgeon, were assessed at a mean of 43 months. The Einzel-Bild-Roentgen-Analysis for the acetabular cup software was used to measure socket orientation. Range of flexion had a moderate positive correlation with cup anteversion (R = 0.26, P = .017), weak but significant negative correlation with neck diameter (R = −0.23, P = .042), and none with anterior femoral head-neck offset. Using multivariate analysis that adjusted for age, sex, cup anteversion and inclination, head-neck offset ratio, head-neck ratio, and neck diameter, the only significant correlate of flexion was cup anteversion (P = .017). Care should be taken during cup placement to allow adequate anteversion to be maintained in Birmingham hip resurfacing because this can affect flexion range of motion.
Keywords: flexion, hip resurfacing, EBRA, anterior femoral head-neck offset, cup version
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No benefits or funds were received in support of the study.
PII: S0883-5403(09)00058-8
doi:10.1016/j.arth.2009.01.026
© 2010 Elsevier Inc. All rights reserved.
