Effect of stem stiffness and bone stiffness on bone remodeling in cemented total hip replacement

摘要: The hypothesis in this study is that the stem stiffness-to-bone stiffness ratio influences incidence and type of bone remodeling fixation with cemented total hip arthroplasty. Ninety-one patients 99 hips had stems using 3 different anatomic porous replacement designs. APR I II titanium proximal coating on one fourth were into 49 35 patients. II-C stem, which a cobalt-chrome only for fixation, was 15 These designs used to metals as well shapes. average follow-up 4.3 years (range, 2-10 years) all having 2 years' 42 at least 5 follow-up. Bone measured stress shielding, calcar resorption, distal hypertrophy anteroposterior lateral radiographs hip. Stress shielding by 4 grades described Engh. A stiffness-to-femoral calculated from plain known manufacturer measurements outer inner diameters femur. There no statistical difference between shapes or metal types these hips. No loose, 10 radiolucent lines. statistically related but more strongly axial ratio, mediolateral bending torsional ratio. grade present 20% 0.5. Five-year results showed change 2-year observations. influenced not stems.