Table 3.

Signed migrations of the Bi-metric femoral stem as mean (95% CI) along and about the 3 orthogonal axes, measured with RSA at 6 weeks, 12 weeks, 1 year, 2 years, and 5 years after surgery

	Rotations, degrees			Rotations, degrees
	Broaching	Compaction		Broaching	Compaction
Medial-lateral (x-axis)			Anterior/posterior tilt (x-axis)
6 weeks	0.07 (0.006 to 0.13)	0.19 (0.08 to 0.30)	6 weeks	−0.09 (−0.45 to 0.28)	0.01 (−0.20 to 0.23)
12 weeks	0.06 (−0.07 to 0.20)	0.17 (0.03 to 0.30)	12 weeks	−0.04 (−0.31 to 0.22)	0.08 (−1.70 to 0.03)
1 year	0.07 (−0.05 to 0.18)	0.19 (0.05 to 0.33)	1 year	−0.13 (−0.49 to 0.23)	−0.01 (−0.35 to 0.33)
2 years	−0.02 (−0.20 to 0.15)	0.07 (−0.22 to 0.35)	2 years	−0.13 (−0.63 to 0.36)	0.01 (−0.49 to 0.53)
5 years	−0.01 (−0.15 to 0.13)	0.16 (−0.003 to 0.32)	5 years	−0.40 (−0.82 to −0.05)	−0.21 (−0.62 to 0.26)
Proximal-distal (y-axis)			Anteversion/retroversion (y-axis)
6 weeks	−1.06 (−1.85 to −0.27)	−0.90 (−1.62 to −0.16)	6 weeks	1.99 (0.53 to 3.47)	1.89 (0.69 to 3.10)
12 weeks	−1.05 (−1.91 to −0.19)	−0.96 (−1.72 to −0.19)	12 weeks	1.71 (0.24 to 3.18)	1.78 (0.50 to 3.08)
1 year	−0.99 (−1.81 to −0.18)	−0.82 (−1.61 to −0.04)	1 year	1.99 (0.44 to 3.56)	1.93 (0.71 to 3.15)
2 years	−0.54 (−1.10 to 0.20)	−0.32 (−0.67 to 0.03)	2 years	0.91 (0.28 to 1.54)	1.08 (0.18 to 2.09)
5 years	−0.88 (−1.77 to 0.003)	−0.67 (−1.45 to 0.12)	5 years	1.67 (0.13 to 3.50)	1.61 (0.37 to 2.86)
Anterior-posterior (z-axis)			Valgus/varus tilt (z-axis)
6 weeks	−0.46 (−0.74 to −0.17)	−0.37 (−0.66 to 0.07)	6 weeks	−0.18 (−0.29 to −0.06)	−0.24 (−0.36 to −0.13)
12 weeks	−0.32 (−0.65 to 0.007)	−0.41 (−0.60 to −0.21)	12 weeks	−0.16 (−0.27 to −0.04)	−0.24 (−0.40 to −0.09)
1 year	−0.41 (−0.78 to −0.03)	−0.37 (−0.61 to −0.14)	1 year	−0.24 (−0.45 to −0.04)	−0.25 (−0.43 to −0.05)
2 years	−0.11 (−0.14 to −0.02)	−0.20 (−0.53 to −0.12)	2 years	−0.15 (−0.32 to −0.02)	−0.04 (−0.32 to 0.25)
5 years	−0.18 (−0.61 to −0.03)	−0.11 (−0.37 to −0.14)	5 years	−0.39 (−0.68 to −0.11)	−0.30 (−0.51 to −0.09)