Table 2 RSA measurement results of femoral stem migration and rotation

Translation (mm)

 Proximal( +)/Distal( −)

6 weeks

 −0.73 (0.72)

 −1.12 to −0.33

 −0.41 (0.83)

 −0.86 to 0.05

0.266

3 months

 −0.59 (0.67)

 −0.96 to −0.22

 −0.48 (0.64)

 −0.84 to −0.13

0.649

6 months

 −0.59 (0.63)

 −0.94 to −0.24

 −0.54 (0.67)

 −0.90 to −0.17

0.829

12 months

 −0.58 (0.68)

 −0.96 to −0.21

 −0.45 (0.76)

 − 0.87 to −0.02

0.604

24 months

 −0.54 (0.65)

 −0.90 to −0.18

 −0.40 (0.66)

 −0.77 to −0.04

0.578

Rotation (degrees)

 Ante-( −)/Retroversion( +)

6 weeks

0.37 (1.82)

 −0.63 to 1.38

 −0.12 (1.95)

 −1.19 to 0.96

0.484

3 months

0.02 (2.45)

 −1.34 to 1.38

 −0.48 (1.76)

 −1.46 to 0.49

0.523

6 months

0.72 (2.48)

 −0.65 to 2.10

 −1.15 (1.64)

 −2.06 to −0.25

0.021*

12 months

0.33 (2.18)

 −0.87 to 1.54

 −0.66 (1.48)

 −1.48 to 0.16

0.155

24 months

1.25 (1.95)

0.17 to 2.33

 −1.29 (1.81)

 −2.30 to −0.29

0.001*

Rotation (degrees)

 Valgus-( +)/Varus( −), Tilt

6 weeks

 −0.29 (0.95)

 −0.81 to 0.24

0.02 (0.19)

 −0.09 to 0.13

0.231

3 months

 −0.01 (0.52)

 −0.30 to 0.27

0.07 (0.51)

 −0.21 to 0.36

0.651

6 months

 −0.22 (0.99)

 −0.77 to 0.33

0.09 (0.47)

 −0.18 to 0.35

0.288

12 months

 −0.11 (0.85)

 −0.57 to 0.36

0.01 (0.41)

 −0.22 to 0.24

0.633

24 months

 −0.13 (0.68)

 −0.51 to 0.25

0.04 (0.39)

 −0.18 to 0.25

0.412

*P < 0.05