Background: The Birmingham Mid-Head Resection (BMHR) is a bone-conserving, short-stem alternative to hip resurfacing for patients with abnormal femoral head anatomy.
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The Journal of Bone & Joint Surgery - Scientific Articles: 21 December 2011 - Volume 93
Hip
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A Biomechanical Comparison of Epiphyseal Versus Metaphyseal Fixed Bone-Conserving Hip Arthroplasty
Michael Olsen, PhD Michael Sellan, MSc Rad Zdero, PhD James P. Waddell, MD, FRCS(C) Emil H. Schemitsch, MD, FRCS(C)Hip
Methods: The current study examines whether a bone-preserving femoral component that is fixed into the femoral neck metaphysis provides a mechanical advantage in terms of resisting femoral neck fracture in comparison with a conventional hip resurfacing implant in a human cadaveric femoral model.
Results: Femora with a BMHR femoral component failed at an average of 23% less load than those prepared with a conventional hip resurfacing component (mean and standard deviation, 5434 ± 2297 compared with 7012 ± 2619 N; p < 0.001).
Conclusions: An uncemented, metaphyseal fixed, bone-conserving femoral implant does not provide superior mechanical strength or increased resistance to femoral neck fracture in comparison with a conventional hip resurfacing arthroplasty.
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