Wear of polyethylene. Observations of retrieved PCA knee implants
Quality of Health Care
In this study, retrieved PE tibial components from a cruciate-sparing knee design, the PCA were examined. The cruciate-sparing design employs a less-conforming tibiofemoral articulation and generally thinner PE components than the total condylar design which we have previously evaluated. The results confirm previous conclusions that non-conforming articulating surfaces on thin PE components will be at higher risk of damage than more conforming surfaces on thicker components. It also appears that the high cyclic loads to which PE implants are subject in vivo are most responsible for the degradation in properties of the material near the articulating surface, though the heat pressing of the PCA components may contribute to the problem.