Polyurethane surface layers with visco-elastic properties similar to natural articular cartilage are proposed for use with single component joint replacement prostheses in which the implant is intended to bear against a natural cartilage surface. Preliminary in vitro experiments were performed to study the effect of fluid film lubrication on the wear of the polyurethane. The results suggest the possibility of designing a metallic prosthesis with a polyurethane surface layer for hemiarthroplasty such that a fluid film will be formed to protect both surfaces during implant functioning.
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