Kinematic Parameters Affecting Biomaterials Wear: 'Cross-pathway' Motion As A Variable In Pin-on-disk Testing

摘要

Osteolysis resulting from ultra-high molecular weight polyethylene (UHMWPE) wear debris production is a limiting factor in the long-term patency of total joint replacements (TKRs). TKR bearing motion is responsible for the production of this UHMWPE wear debris. Although seemingly complex, there are actually ONLY THREE kinematic variables that can potentially influence the production of wear at any discrete bearing contact point. These are: 1) the magnitude of the bearing contact sliding velocity vector, 2) the orientation of the bearing contact sliding velocity vector, and 3) the temporal effect of repeated motion at a bearing contact over time. This study uses a new pin-on-disk wear-testing platform to study the effects of the "cross motion pathway" temporal event on the damage rate of UHMWPE.