Table 1.

Development and Frequency of Sarcomas in Biomaterial Groups

Implant group	Earliest sarcoma (weeks)	% of implantation sites with sarcoma at 2 years
Polyethylene	26	35
Polyurethane	36	35
Polyvinylchloride	40	24
Polymethylmethacrylate	50	20
Silicone	52	31
Titanium	48	12
Nickel-chromium	46	33
Aluminum oxide	42	23