An investigation of the effects of extrusion environment on ultra-high molecular weight polyethylene [low-friction endoprostheses]

In an effort to eliminate potential oxidation, some vendors have experimented with the idea of extruding ultra-high molecular weight polyethylene (UHMWPE) in an inert atmosphere. In this investigation, the microscopic morphology, percent crystallinity, and melting temperature of UHMWPE extruded in a nitrogen atmosphere were compared with those of standard UHMWPE extruded in air. An examination of the results indicated that extrusion in an inert gas atmosphere did not adversely affect these material properties