Table 4.

Cup migration. Values are mean (95% CI)

Axis/Months	UHMWPE	VEPE	p-value a
Translation (mm)
X-axis, medial (+) or lateral (-)
3	0.01 (-0.02 to 0.04)	0.06 (-0.01 to 0.14)	0.3
12	-0.01 (-0.09 to 0.07)	0.07 (-0.05 to 0.18)
24	0.01 (-0.06 to 0.07)	0.09 (-0.04 to 0.22)
60	0.02 (-0.09 to 0.12)	0.16 (-0.02 to 0.35)	0.1
Y-axis, proximal (+) or distal (-)
3	0.08 (0.03 to 0.13)	0.17 (0.10 to 0.24)	0.06
12	0.14 (0.06 to 0.22)	0.22 (0.13 to 0.32)
24	0.17 (0.08 to 0.26)	0.24 (0.15 to 0.33)
60	0.21 (0.04 to 0.39)	0.24 (0.13 to 0.36)	0.3
Z-axis, anterior (+) or posterior (-)
3	0.06 (0.00 to 0.13)	0.02 (-0.05 to 0.09)	0.3
12	0.04 (-0.22 to 0.10)	-0.01 (-0.07 to 0.05)
24	0.02 (-0.04 to 0.09)	-0.01 (-0.09 to 0.06)
60	0.01 (-0.02 to 0.22)	0.05 (-0.03 to 0.13)	0.9
Rotation (°)
X-axis, anterior (+) or posterior (-)
3	0.09 (-0.03 to 0.22)	0.07 (-0.08 to 0.23)	0.7
12	0.10 (-0.13 to 0.32)	0.13 (-0.03 to 0.29)
24	0.08 (-0.09 to 0.26)	0.11 (-0.09 to 0.30)
60	-0.02 (-0.35 to 0.31)	0.29 (0.04 to 0.55)	0.01
Y-axis, anteversion (+) or retroversion (-)
3	-0.07 (-0.18 to 0.04)	-0.11 (-0.26 to 0.05)	0.9
12	-0.11 (-0.37 to 0.15)	-0.05 (-0.21 to 0.10)
24	-0.10 (-0.29 to 0.08)	-0.13 (-0.29 to 0.02)
60	-0.01 (-0.29 to 0.26)	-0.11 (-0.35 to 0.12)	0.5
Z-axis, decreased (+) and increased inclination (-)
3	-0.07 (-0.16 to 0.03)	-0.10 (-0.32 to 0.12)	0.9
12	-0.25 (-0.54 to 0.04)	-0.17 (-0.48 to 0.14)
24	-0.20 (-0.40 to 0.01)	-0.08 (-0.44 to 0.27)
60	-0.24 (-0.55 to 0.07)	-0.03 (-0.50 to 0.44)	0.2

^aSee Table 3