Abstract
Low fatigue strength of highly cross-linked ultrahigh molecular weight polyethylene (UHMWPE) causes concern about the increased risk of fracture. We describe a wear and oxidation-resistant UHMWPE with high fatigue strength by limiting cross-linking to the articular surface. We obtained cross-linking in the surface by molding implants with a low concentration of vitamin E on the surface and high concentration in the bulk prior to irradiation using the ability of vitamin E to hinder cross-linking in UHMWPE as a function of concentration.
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