Table 3.

Summary of statistical comparisons of total through-thickness wear rates

Wear rate	In vivo duration		RP through-thickness wear rate
	Spearman’s rho	p value	p value
RP through-thickness wear rate	0.176	0.11
Fixed bearing through-thickness wear rate	0.469	< 0.001	0.03
Fixed bearing Ti tray wear rate	0.494	< 0.001	0.001
Fixed bearing CoCr tray wear rate	0.037	0.83	0.04

Correlation of wear rates (Column 1) to in vivo duration is shown in Column 2; results of t-test for equality of means between wear rates (Column 1) to RP wear rate are given in Column 3; RP = rotating platform; Ti = titanium; CoCr = cobalt-chrome.