Computer Simulation Prediction of the Operational Capability and Reliability of a Condylar Prosthesis

A finite element simulation of the state of stress in the femur-condylar prosthesis biotechnical system is performed, and its mechanical behavior is analyzed. The metallic components of the endoprosthesis (implant) are made of a VT6 titanium alloy, and the plateau of the tibial component is made of ultrahigh-molecular-weight polyethylene. The stresses in the bone structures and the most severely loaded components of the endoprosthesis are calculated at a functional load of 3300 N. A high degree of similarity of the biomechanical behavior of the biotechnical system (with the endoprosthesis) to the behavior of a healthy femur has been established. The stresses and strains of all components of the biotechnical system are shown not to exceed their critical values. The calculation results made it possible to predict the operational capability and reliability of the endoprosthesis components under static and cyclic loads, the wear resistance of the mobility unit, and the reliability of the cement mantle.