"Wear volume (mm3) of UHMWPE tibial components articulating against CoCr and PEEK femoral components tested in clean lubricant, lubricant with porcine bone particles and lubricant containing PMMA cement particles (Figure 2)." cycles PEEK 1 PEEK 2 PEEK 3 CoCr 1 CoCr 2 CoCr 3 clean lubricant 0 0 0 0 0 0 0 0.362522 1.635974304 1.023554604 0.327623126 2.286937902 1.539614561 1.573875803 0.722256 3.375802998 2.082441113 0.981798715 4.129550321 3.003211991 2.962526767 0.968704 4.085653105 3.259100642 1.980728051 5.049250535 4.098501071 4.139186295 porcine bone particles 1.322383 8.298715203 5.654175589 4.200214133 8.292291221 5.510706638 6.964668094 1.671963 12.87044968 7.934689507 6.793361884 12.0738758 7.176659529 8.966809422 1.924663 16.20449679 9.812633833 8.377944325 14.49143469 8.185224839 10.2130621 PMMA cement particles 2.291331 29.53640257 28.09528908 23.9882227 54.35653105 43.04603854 55.67773019 2.486662 55.47858672 54.82334047 42.64775161 82.16167024 81.22376874 83.36937901 2.855324 118.891863 109.143469 93.45182013 120.2398287 124.0235546 120.0235546