Table 5.
Migration results of the femoral and tibial components. All data is presented as mean (SD), except for the maximum total point motion (MTPM), which was not normally distributed and is presented by the mean, median, and range
| Factor | Femoral component | Tibial component | ||||||
|---|---|---|---|---|---|---|---|---|
| 6 weeks | 6 months | 12 months | 24 months | 6 weeks | 6 months | 12 months | 24 months | |
| Translation, mm | ||||||||
| X (+ medial/– lateral) | 0.10 (0.27) | 0.11 (0.26) | 0.16 (0.39) | 0.12 (0.35) | 0.05 (0.22) | 0.03 (0.18) | 0.03 (0.18) | 0.06 (0.20) |
| Y (+ cranial/– caudal) | -0.06 (0.42) | 0.05 (0.16) | 0.02 (0.22) | 0.07 (0.18) | –0.22 (0.93) | –0.12 (0.22) | –0.14 (0.27) | –0.17 (0.33) |
| Z (+ anterior/– posterior) | 0.17 (0.59) | 0.06 (0.22) | 0.12 (0.28) | 0.04 (0.29) | 0.08 (0.23) | 0.04 (0.21) | –0.0002 (0.18) | 0.01 (0.20) |
| Rotation, degrees | ||||||||
| X (+ anterior/– posterior tilt) | –0.22 (0.98) | 0.01 (0.25) | –0.01 (0.33) | 0.16 (0.33) | 0.75 (2.4) | 0.46 (0.84) | 0.47 (0.96) | 0.45 (1.1) |
| Y (+ internal/– external) | 0.08 (0.53) | 0.07 (0.40) | 0.002 (0.61) | 0.02 (0.43) | 0.08 (0.52) | 0.13 (0.48) | 0.16 (0.63) | 0.08 (0.62) |
| Z (+ adduction/– abduction) | 0.21 (0.50) | 0.18 (0.47) | 0.22 (0.57) | 0.17 (0.53) | –0.12 (0.58) | –0.29 (0.79) | –0.37 (0.87) | –0.55 (1.2) |
| MTPM, mm, mean | 0.67 | 0.52 | 0.66 | 0.58 | 0.84 | 0.72 | 0.80 | 0.90 |
| median | 0.44 | 0.47 | 0.44 | 0.48 | 0.50 | 0.60 | 0.75 | 0.76 |
| range | 0.13–4.1 | 0.19–1.1 | 0.17–1.9 | 0.29–1.9 | 0.08–8.7 | 0.33–1.4 | 0.25–1.7 | 0.23–1.8 |