Numerical modeling of the femur prosthesis after the lower limb amputated

Abstract

This thesis focuses on the numerical modeling of a femoral prosthesis in a lower-limb amputee, comparing two configurations: with and without a total hip replacement (THR) implant. The study is based on finite element simulations performed using ABAQUS, aiming to evaluate the biomechanical behavior during level walking. The results reveal that the presence of the implant significantly alters the distribution of mechanical stresses. It causes a marked concentration of Von Mises stresses in the bone and a substantial increase in contact pressures and shear stresses in the soft tissues (muscle and stump), as well as in the socket and liner. While this configuration enhances load transmission and mechanical stability, it also increases the risk of clinical complications such as bone resorption, tissue damage, and discomfort. In contrast, the model without the implant demonstrates a more homogeneous stress distribution, closer to natural physiological conditions, though with reduced stability. This study highlights the importance of optimizing implant design and adopting a patientspecific approach to minimize postoperative complications, improve comfort, and ensure long-term prosthesis durability