“…Contemporary simulator studies, using bovine serum as the lubricant, have shown PE wear-rates lower than the clinical rates (Livermore et al 1990, Kabo et al 1993, Saikko, 1993, Callaghan et al 1995, Bragdon et al 1996, Clarke et al 1997, McKellop et al 1997, Jasty et al 1997 and PTFE wear-rates 4 times higher than the clinical rates (Clarke et al 1995, Good et al 1996. Waterlubricated tests of both materials showed wearrates much lower than the clinical rates (Saikko 1993, Clarke et al 1995, Good et al 1996, Phipatanakul et al 1998).…”