期刊
JOURNAL OF ARTHROPLASTY
卷 24, 期 7, 页码 1137-1142出版社
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1016/j.arth.2008.08.005
关键词
hip resurfacing; finite element model; stress shielding; surgical technique; bone remodeling
类别
资金
- Stryker Orthopaedics
Valgus alignment of femoral resurfacing components has been advocated to reduce proximal femur loading and thus minimize the risk for femoral neck fractures. However, Such reduction in loading may exacerbate undesirable stress shielding. This Study examined the effect of extreme implant orientations (+/- 50 degrees) and stem canal overreaming on initial bone remodeling stimulus using finite element models. The changes in implant-cement interface stresses due to implant alignment were also evaluated. The valgus model showed increased initial bone resorption stimulus, which extended distally and peripherally around the femoral neck. The peak implant-cement interface shear stress for the varus model was 10.9 MPa, exceeding the interface shear strength. Overreaming of the stem canal eliminated distal tip loading, but proximal stress shielding was Still unavoidable. These data show bone loading and interface fixation trends emanating from valgus and varus implant positions that will be of interest to practicing physicians.
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