Influence of material stiffness of total hip prosthesis in isotropic bone-remodeling process analysis
José Eduardo Gubaua1; Gabriela Wessling Oening Dicati1; Jucélio Tomás Pereira1
1 Federal University of Paraná
doi:10.20906/CPS/CILAMCE2017-0211
Resumo
Total Hip Arthroplasty (THA) is a surgery that replaces the damaged natural joint by an artificial one composed by biomaterial. This procedure is a bone-adaptation example, which occurs mainly because the change of loading condition applied on femur after THA, loaded by shear forces in interface. The higher material stiffness, the less is the load dissipation in femoral proximal epiphyses. Resorption and apposition cells make the biological adaptation process, replacing damage bone tissue for a new and healthy one. This process is called bone remodeling. Development of mathematical models combined with Finite Element Method (FEM) enable the evaluation of bone tissue behavior. The present study aims the evaluation of bone-remodeling process around total hip prosthesis made by different biomaterials (cobalt-chrome and titanium alloys and a virtual material with Young's modulus similar to cortical bone). FEM is applied coupled with the Stanford isotropic bone-remodeling model in the software Abaqus. The total hip prosthesis is considered totally bonded with host tissue. The results show that flexible materials allow a high dissipation of loads along the interface region, which promotes the bone maintenance. However, it can generate high-levels of stress, mainly in proximal femoral portion, which can cause a bone fracture.
Palavras-chave: Bone remodeling; Finite Element Method; Abaqus ; Total hip Arthroplasty; Biomaterials