Table 4.

Segment (signed) motion (mm) of the clinical RSA examinations at 2-year follow-up

Axis:	DLC all-poly Cup (n = 10 a)			Electra screw cup (n = 10 a)
	x	y	z	x	y	z
Mean (mm)	0.09 b	0.10	0.07	–0.02 b	0.10	–0.02
SD (mm)	0.06	0.09	0.19	0.09	0.15	0.15
Minimum	0.002	–0.12	–0.20	–0.25	–0.07	–0.26
Maximum	0.17	0.22	0.42	0.13	0.49	0.20

^a Values are given without the 2 outliers at 2 years (1 loose/revised cup and 1 sus- pected loose cup; both with total translations of > 1 mm).

^b Significant difference* in migration (t-test; p = 0.003)