Wear factor (mm3/Nm) of UHMWPE pins against smooth (control) CoCr and PEEK-OPTIMA plates and plates which had undergone damage simulation with particles of PMMA cement, data relates to Figure 3.				
				
	CONTROL TEST		THIRD BODY DAMAGE	
	CoCr	PEEK	CoCr	PEEK
Sample 1	1.63E-07	1.47E-07	2.19E-07	1.66E-07
Sample 2	2.33E-07	2.77E-07	1.48E-07	1.57E-07
Sample 3	2.75E-07	1.54E-07	1.97E-07	2.67E-07