The effect of IPN surface modification on the mechanical properties of UHMWPE.

This paper investigates the effect of IPN surface treatment on the mechanical properties of ultra high molecular weight polyethylene (UHMWPE). Traditional UHMWPE was modified by introducing poly-L-lysine (PLL) into their surface and forming a semi-interpenetrating network (IPN). Tensile, creep and fatigue tests were performed on these IPN and the control specimens.

Clinical wear of 63 ultrahigh molecular weight polyethylene acetabular components: effect of starting resin and forming method.

This study compares the clinical wear rates and implant characteristics of 63 surgically retrieved acetabular components. All components were made by the same manufacturer, implanted by the same surgeon, in articulation against the same type of femoral component, and revised for the same reason; 19 were made from directly compression molded, calcium stearate free, ultrahigh molecular weight polyethylene (UHMWPE) and 44 were made from machined, ram extruded, calcium stearate containing UHMWPE. There were significant differences in wear, duration, and wear rate between the molded (type I) and machined (type II and III) components.

Comparison of the in vivo wear rates of 43 surgically retrieved direct compression molded and ram extruded ultra high molecular weight polyethylene acetabular components.

The objective of this study was to investigate retrieved ultra high molecular weight polyethylene (UHMWPE) liners from Total HIp Arthroplasty (THA) revisions. The amount of in vivo wear on compression molded v. ram extruded and machined acetabular liners was the focus of comparison between 43 surgically retrieved samples.