Wear studies for development of an intervertebral disc prosthesis

wear, spinal implant, cobalt-chro- mium-molybdenum, titanium-6%AI-'1%V alloy, biocompatibility Two long-tam wsar Li0h::vicr studias Used In part df the process of selecting the test mate riels fur a nevv ? ll-met-Hl Drthopaadic spinal implantere presented. The ralEjtiuij and ubsuiutB wu:ir VDIUMIH rjtUti uf candidate metatg were investigated through simulation of tw0 bearing regions of on intervertebral disc prosthesis-, [t wai determined gravirrtalrically that not isostatically pressed Co-Cr-Mo alloy provided the lowest Co-Cr-Mo alloy wear debris generation. It had an average wear volume rate of 0.093 mm1,'million cycles from a sprlng-ln-paetoat simulation and 0, 126 mmViiniori cycles from a hinge (pin-in-siot) simulation. The estimated total wear volume of a hot isostatically pressed intorvBrtapral disc prosthesis w'th tlianlum-6%Ai-aW all&y s prints was 3, 9 iwm ^million cycles.