Table 4.

Risk of dislocation for femoral head sizes and bearing types

Bearing types	28mm	32mm	36mm	p-values †
M on XP	2.4% n = 1085	2.2% n = 1954	1.9% n = 642	0.93
C on XP	2.2% n = 186	1.7% n = 841	1.2% n = 681	0.58
M on PE	3.9% n = 195	2.7% n = 369	0% n = 6	0.28
C on PE	2.9% n = 206	2.2% n = 413	N/A	0.50
C on C	0% n = 31	2.0% n = 196	1.0% n = 105	0.48

^†Cochran-Armitage Trend Test