Stress and Strain Distribution in Cemented Total Hip Arthroplasty for Walking Load Case

摘要

Aseptic loosening is the critical reason for the failure of the cemented total hip arthroplasty. It occurs due to bone remodeling triggered by stress shielding and cement mantle fracture. In this study, stress shielding and bone thickening phenomenon of the cemented THA femur was analysed using three dimensional finite element method for walking load case. The intact femur is modeled to consist of cortical bone and cancellous bone. The prosthesis stem and bone cement are modeled to be biocompatibility Ti-6Al-4V alloy and polymethyl-methacrylate (PMMA). The maximum principal stress of THA femur is lower than that predicted in intact femur at the middle region which leads to stress shielding problems. While higher stress at the bottom region enhance bone thickening and contribute to prosthesis loosening.