Journal
JOURNAL OF ARTHROPLASTY
Volume 24, Issue 7, Pages 1137-1142Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1016/j.arth.2008.08.005
Keywords
hip resurfacing; finite element model; stress shielding; surgical technique; bone remodeling
Categories
Funding
- Stryker Orthopaedics
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available