Biomechanical Properties FEM Analysis And Comparative Study Of The 2052-2102 And Plus Femoral Prostheses

Hip joint is an important moving and bearing joint, but its dysfunction caused by pathological changes, accidents and other reasons affects the patient’s normal life and work greatly. An effective treatment for hip disease is the artificial hip replacement, in which the biomechanical property of femoral prosthesis has a vital impact on the artificial hip joint’s stability and long-term efficacy. Therefore, it is particularly important to design a reasonable femoral prosthesis for a better adaption to human body’s physiological environment. With the widely application of finite element analysis technique in biomechanics, it is becoming an effective means using FEA to research & develop and evaluate a new prosthesis to guide the clinical therapy.This paper takes the 2052-2102 new femoral prosthesis as the research object, which is optimally designed based on the Plus standard femoral prosthesis by an orthopedic Materials Co., Ltd. Through exploring the new femoral prosthesis’s optimizing effect on biomechanical performance analysis, it provides theoretical reference for the later biomechanical test and prosthesis’s optimization design.Firstly, this paper carried out a comparative study of biomechanical properties between the 2052-2102 new femoral prosthesis and the Plus standard femoral prosthesis:The 3D reconstruction of human femur based on medical images was completed, and the replacement models used for finite element analysis have been made by assembling femur with 2052-2102 and Plus prosthesis respectively. Static, gait and torsion load were applied respectively for these two replacement models after meshing and setting during finite element simulation. By contrasting finite element analysis results, these two kinds of prosthesis’ biomechanical properties in security, stability, reducing stress shielding, avoiding subsidence or loose and other aspects have been evaluated.Secondly, with an example of the 2052-2102 femur replacement model, the influence on the research of biomechanics between simplified material model and heterogeneous material model has been analyzed: In order to achieve the description of non-uniformity material, heterogeneous material to femur was assigned. On the other hand, the differences of analysis results between two material models have been compared by applying static, gait and torsion load respectively to the heterogeneous material model.Finally, the influence on prosthesis’s fatigue life between simplified material model and heterogeneous material model under the gait load was studied by taking 2052-2102 new femoral prosthesis as a research object. Also, the fatigue life between 2052-2102 and Plus femoral prosthesis was compared and a theoretical basis for the safe use and optimal design of artificial hip joints has been provided.