Table 3.

Measurement of polyethylene liner wear up to 5 years (measured as femoral head penetration)

	6 months		12 months		24 months		5 years
	mean	± 95% CI	mean	± 95% CI	mean	± 95% CI	mean	± 95% CI
Proximal wear (y axis)	0.12	0.15	0.12	0.18	0.09	0.16	0.13	0.17
2D wear (x and y axis)	0.20	0.19	0.22	0.22	0.20	0.20	0.23	0.23
3D wear (x, y, and z axis)	0.32	0.18	0.33	0.24	0.34	0.21	0.32	0.21

Mean (Confidence Interval).