Wear factor (mm3/Nm) of UHMWPE pins tested against PEEK-OPTIMA and cobalt chrome plates scratched with a diamond stylus as a function of pre-test (initial) lip height (micrometer), data relates to Figure 5.								
								
	0um lip height		1um lip height		2um lip height		4um lip height	
	Initial lip height	wear factor	Initial lip height	wear factor	Initial lip height	wear factor	Initial lip height	wear factor
CoCr 1	0	3.31E-07	1.35	3.36E-07	2.24	4.54E-07	3.85	1.08E-06
CoCr 2	0	3.81E-07	1.31	3.47E-07	2.06	4.50E-07	4.32	1.05E-06
CoCr 3	0	3.19E-07	1.38	4.18E-07	2.18	4.17E-07	4.68	7.70E-07
CoCr 4	0	5.40E-07			2.28	5.92E-07	4.42	1.06E-06
PEEK 1	0	3.77E-07	1.00	2.53E-07	2.80	1.58E-07	3.50	2.78E-07
PEEK 2	0	1.91E-07	1.05	3.33E-07	2.55	3.82E-07	4.83	2.69E-07
PEEK 3	0	6.22E-07	1.28	2.39E-07	2.58	1.78E-07	3.72	5.83E-07
PEEK 4	0	6.01E-07			3.33	6.31E-07	4.83	7.70E-07