Lattice hip implant design by multi-scale multi-constraint topology optimization

Abstract eng:
Bone resorption is one of the main issues that lead to aseptic loosening and revision surgery after total hip arthroplasty. One of the reasons for bone resorption is stress shielding caused by the prosthesis stiffness usually much higher than that of the bone tissue. To address this problem, we present a mechanically biocompatible hip implant that consists of a graded-density lattice material obtained via multi-scale multi-constraint topology optimization (TO). Asymptotic homogenization is used to deal with the multi-scale mechanics of the implant and a modified proportional TO is used to obtain the relative density distribution of the implant. The result shows that bone resorption for the optimized implant is only 9% of that of a fully solid titanium implant that is commonly used in current total hip arthroplasty.

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