Comparison of Acetabular Wear and Osteolysis in RAM Extruded vs Machined Compression Molded UHMWPE

Introduction: Reduced implant survivorship due to aseptic loosening has prompted research into alternative bearing materials. Simulator testing is useful, but clinical studies are the criterion standard to evaluate the wear characteristics of new bearing materials. Net compression molded polyethylene has clinically reported improved wear characteristics over traditionally used RAM extruded UHMWPE. Machining of the compression molded acetabular component, however, may be detrimental to its wear properties.