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Alterations in femoral strain following hip resurfacing and total hip replacement

¹ Department of Orthopaedic Surgery, Univesity of California Davis Medical Center, 4860 Y St, Suite 3800, Sacramento, California 95817, USA.
² JD Wheat Veterinary Orthopaedic Research Laboratory, School of Veterinary Medicine University of California, Davis, California 95616, USA.
³ Biomedical and General Engineering Department California Polytechnic State University, San Luis Obispo, California 93407, USA.

Correspondence should be sent to Dr S. J. Hazelwood; e-mail: shazelwo{at}calpoly.edu

Bone surface strains were measured in cadaver femora during loading prior to and after resurfacing of the hip and total hip replacement using an uncemented, tapered femoral component. In vitro loading simulated the single-leg stance phase during walking. Strains were measured on the medial and the lateral sides of the proximal aspect and the mid-diaphysis of the femur. Bone surface strains following femoral resurfacing were similar to those in the native femur, except for proximal shear strains, which were significantly less than those in the native femur. Proximomedial strains following total hip replacement were significantly less than those in the native and the resurfaced femur.

These results are consistent with previous clinical evidence of bone loss after total hip replacement, and provide support for claims of bone preservation after resurfacing arthroplasty of the hip.