Table 3.

Femoral stem migration between 2 and 9 years

	2 years median (range)	9 yearsamedian (range)	Difference (95% CI of median)	p-valueb
Translation compared with baseline, mm
x-axis	0.02 (–0.46 to 2.58)	0.00 (–0.48 to 2.80)	–0.02 (–0.08 to 0.07)	0.7
y-axis	–0.73 (–4.67 to 0.05)	–0.73 (–4.53 to 0.11)	–0.05 (–0.08 to 0.03)	0.2
z-axis	–0.25 (–1.03 to 2.17)	–0.29 (–1.79 to 1.52)	–0.07 (–0.17 to 0.13)	0.3
Rotation compared with baseline, degrees
x-axis	0.18 (–3.23 to 11.04)	0.39 (–3.68 to 11.06)	0.02 (–0.14 to 0.18)	0.6
y-axis	0.34 (–10.38 to 4.00)	0.24 (–10.76 to 4.12)	0.09 (–0.69 to 0.73)	0.9
z-axis	–0.16 (–1.32 to 1.03)	–0.21 (–2.29 to 1.05)	0.02 (–0.17 to 0.12)	1.0

^aRange of follow-up 7.8–9.3 years.

^bRelated-samples Wilcoxon signed rank test.