Thesis: Modeling the biomechanical behavior of a bi-prosthetic femur for the development of a decision-making tool for the implant of a preventive plate

PhD defense: Ahmed ABDELKADER

Title: Modeling the biomechanical behavior of a bi-prosthetic femur for the development of a decision-making tool for the implant of a preventive plate

Team: MMB

Abstract: Total hip arthroplasty (THA) and total knee arthroplasty (TKA) have become increasingly common procedures in the elderly. However, there is a high risk of inter-prosthetic fracture (IPF) for patients who have undergone hip and knee arthroplasty on the same leg. In this study, we evaluate from numerical simulations, the mechanical response of a femur with total hip and knee arthroplasty in both compression and flexion with different boundary conditions. The problematic will thus focus on the analysis of the risk factors of occurrence of fractures of the bi-prosthetic femur by evaluating and characterizing the local constraints undergone by this femur with a focus on the inter-prosthetic fractures. The objective is therefore to understand the mechanisms of overstress and their effects on fracture so as to be able to assess the risk of fracture, depending on the zone of the femur "free of implant", with the aim of preventing the patient. The evaluation of this risk would also be of interest to adapt the length of the prosthetic implants of primary or revision, or even to question the classically defined lengths of the femoral pivots of total hip replacement (THR) or total knee replacement (TKR). To achieve this objective, we propose to develop a decision support tool for the orthopedic surgeon, in order to define an optimal geometry of the prosthesis to be implanted and to determine the need to implant a preventive peri-prosthetic diaphyseal femoral plate. This tool will be based on finite element modeling.

This defense will be held in English and will take place on Tuesday 14 September 2021 at 05:00 pm at the seminar room (109), 4, rue Boussingault à Strasbourg.

Keywords: Bi-prosthetic femur, Inter-prosthetic fracture, Finite Element, Strain, Stress