Table 5

Translations and rotations of collarless femoral stems by surgical approach, from the day of surgery to 1 year after surgery

Plane	Direct anterior, mean ± SD						Direct lateral, mean ± SD						p value

	2 wk	4 wk	6 wk	12 wk	26 wk	52 wk	2 wk	4 wk	6 wk	12 wk	26 wk	52 wk
Translation, mm

x	0.20 ± 0.64	0.21 ± 0.71	0.18 ± 0.71	0.25 ± 0.74	0.27 ± 0.69	0.17 ± 0.79	−0.01 ± 0.33	−0.01 ± 0.26	0.02 ± 0.24	0.001 ± 0.20	0.04 ± 0.22	0.01 ± 0.28	0.321

y	−3.21 ± 3.21	−3.61 ± 3.31	−3.71 ± 3.39	−3.62 ± 3.47	3.72 ± 3.44	3.66 ± 3.57	−0.08 ± 0.69	−0.21 ± 0.71	−0.19 ± 0.63	−0.23 ± 0.68	−0.29 ± 0.76	−0.23 ± 0.69	0.002

z	−0.61 ± 0.88	−0.74 ± 1.08	−0.75 ± 1.05	−0.69 ± 1.10	−0.63 ± 1.07	−0.49 ± 1.02	−0.06 ± 0.42	−0.18 ± 0.27	−0.12 ± 0.36	−0.14 ± 0.41	−0.12 ± 0.32	−0.09 ± 0.38	0.064

Rotation, °

x	0.51 ± 0.62	0.36 ± 0.62	0.31 ± 0.74	0.36 ± 0.98	0.45 ± 0.67	0.65 ± 0.87	0.30 ± 0.65	0.12 ± 0.59	0.20 ± 0.60	0.20 ± 0.49	0.25 ± 0.56	0.22 ± 0.69	0.250

y	−2.70 ± 4.22	−3.10 ± 4.25	−3.47 ± 4.51	−3.04 ± 4.43	−3.34 ± 4.30	−3.53 ± 4.39	−0.40 ± 0.82	−0.56 ± 0.50	−0.83 ± 1.74	−0.58 ± 1.21	−0.88 ± 0.78	−0.55 ± 1.14	0.040

z	0.36 ± 1.39	0.27 ± 1.46	0.45 ± 1.59	0.47 ± 1.45	0.39 ± 1.45	0.46 ± 1.58	0.13 ± 0.18	0.10 ± 0.16	0.06 ± 0.19	0.15 ± 0.20	0.16 ± 0.18	0.11 ± 0.23	0.589

SD = standard deviation.