Table 3.
Stem translation and rotation at 3 months, 1 year, 2 years, and 5 years
| 3 Months |
12 months |
24 months |
60 months |
|||||
|---|---|---|---|---|---|---|---|---|
| Type of motion | Mean | 95% CI | Mean | 95% CI | Mean | 95% CI | Mean | 95% CI |
| Stem translation, segment motion, mm | ||||||||
| Y-translation a | ||||||||
| HAC | –0.31 | –0.50 to –0.13 | –0.33 | –0.52 to –0.14 | –0.26 | –0.46 to –0.07 | –0.29 | –0.51 to –0.07 |
| Active | –0,99 | –1.64 to –0.35 | –0.98 | –1.66 to –0.30 | –0.98 | –1.66 to –0.29 | –1.04 | –1.75 to –0.34 |
| X-translation | ||||||||
| HAC | 0.04 | –0.04 to 0.12 | 0.04 | –0.05 to 0.13 | 0.07 | –0.02 to 0.15 | 0.07 | –0.02 to 0.17 |
| Active | –0.10 | –0.38 to 0.17 | –0.09 | –0.37 to 0.20 | –0.08 | –0.35 to 0.18 | –0.08 | –0.38 to 0.21 |
| Z-translation | ||||||||
| HAC | –0.22 | –0.33 to –0.11 | –0.21 | –0.32 to –0.09 | –0.13 | –0.27 to 0.00 | –0.19 | –0.32 to –0.05 |
| Active | –0.22 | –0.49 to 0.05 | –0.15 | –0.42 to 0.11 | –0.18 | –0.46 to 0.10 | –0.22 | –0.51 to 0.07 |
| Stem rotation, segment motion, degrees | ||||||||
| Y-rotation b | ||||||||
| HAC | 0.80 | 0.38 to 1.22 | 0.80 | 0.37 to 1.23 | 0.92 | 0.53 to 1.32 | 0.86 | 0.41 to 1.30 |
| Active | 1.18 | 0.44 to 1.93 | 1.28 | 0.47 to 2.09 | 1.26 | 0.46 to 2.05 | 1.32 | 0.48 to 2.16 |
| X-rotation | ||||||||
| HAC | –0.07 | –0.20 to 0.07 | –0.08 | –0.25 to 0.09 | –0.25 | –0.41 to –0.10 | –0.15 | –0.37 to 0.07 |
| Active | 0.02 | –0.17 to 0.21 | –0.22 | –0.39 to –0.04 | –0.23 | –0.42 to–0.04 | –0.22 | –0.37 to –0.07 |
| Z-rotation | ||||||||
| HAC | –0.19 | –0.32 to –0.06 | –0.22 | –0.34 to –0.09 | –0.22 | –0.34 to –0.10 | –0.25 | –0.40 to –0.09 |
| Active | –0.28 | –0.59 to 0.03 | –0.29 | –0.63 to 0.05 | –0.30 | –0.64 to 0.03 | –0.32 | –0.68 to 0.04 |
a proximal (+), distal (–)
b retroversion (+)