Hip Implant Design With Three-Dimensional Porous Architecture of Optimized Graded Density

Author:

Wang Yingjun1,Arabnejad Sajad2,Tanzer Michael3,Pasini Damiano4

Affiliation:

1. National Engineering Research Center of Novel Equipment for Polymer Processing, The Key Laboratory of Polymer Processing Engineering of the Ministry of Education, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China

2. Department of Mechanical Engineering, McGill University, Montreal, QC H3A0C3, Canada

3. Jo Miller Lab, Division of Orthopaedic Surgery, McGill University, Montreal, QC H3G 1A4, Canada

4. Department of Mechanical Engineering, McGill University, Montreal, QC H3A0C3, Canada e-mail:

Abstract

Even in a well-functioning total hip replacement, significant peri-implant bone resorption can occur secondary to stress shielding. Stress shielding is caused by an undesired mismatch of elastic modulus between the stiffer implant and the adjacent bone tissue. To address this problem, we present here a microarchitected hip implant that consists of a three-dimensional (3D) graded lattice material with properties that are mechanically biocompatible with those of the femoral bone. Asymptotic homogenization (AH) is used to numerically determine the mechanical and fatigue properties of the implant, and a gradient-free scheme of topology optimization is used to find the optimized relative density distribution of the porous implant under multiple constraints dictated by implant micromotion, pore size, porosity, and minimum manufacturable thickness of the cell elements. Obtained for a 38-year-old patient femur, bone resorption is assessed by the difference in strain energy between the implanted bone and the intact bone in the postoperative conditions. The numerical results suggest that bone loss for the optimized porous implant is only 42% of that of a fully solid implant, here taken as benchmark, and 79% of that of a porous implant with uniform density. The architected hip implant presented in this work shows clinical promise in reducing bone loss while preventing implant micromotion, thereby contributing to reduce the risk of periprosthetic fracture and the probability of revision surgery.

Publisher

ASME International

Subject

Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials

Reference77 articles.

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