Predictive Assessment of Maximum Contact Pressures in Metal-on-Polymer Hip Joint Implants by Analytical Method and FEM

In more than 90% of hip replacements, the acetabular cup is made ultra-high molecular weight polyethylene (UHMWPE) and femoral head stainless steel, cobalt-chromium-molybdenum alloys, titanium or ceramic. The primary factor in evaluating soft-on-hard endoprostheses maximum contact pressure as strength UHMWPE. level these pressures used a criterion for correct selection size radial clearance connection during arthroplasty specific patient. According to previously developed new analytical method proposed estimating thermo-diffusion nitrided (TDN) GRADE 2 – UHMWPE joint implant. effects implant diameter on are determined average load. Relationships between above-mentioned parameters established. A comparison estimated by numerical analysis with ANSYS (2D 3D). calculated using 2D model have been found be lower limit, 3D upper limit calculations. Therefore, it should expected that at thickness ˜ 7…8 mm stresses will not significantly different those obtained from solution above method. can effectively research only (metal-on-polymer, ceramics-on-polymer), but also hard-on-hard (metal-on-metal, ceramics-on-ceramics). results calculations were related FEM known literature their convergence was