Table 2.
Precision values of the cup wear and migration analysis. The value given represents the smallest migration that is considered statistically significant and is based on 2 SD of the error obtained. This therefore corresponds to the 95% confidence limit
| Axis | n | Mean (SD) | Precision values |
|---|---|---|---|
| Wear: Y-translation (mm) | 48 | 0.00 (0.04) | 0.09 |
| Cup translation (mm) | |||
| X | 53 | 0.01 (0.05) | 0.09 |
| Y | 53 | -0.01 (0.04) | 0.08 |
| Z | 53 | 0.01 (0.09) | 0.18 |
| Cup rotation (°) | |||
| X | 53 | 0.24 (0.22) | 0.43 |
| Y | 53 | 0.00 (0.25) | 0.48 |
| Z | 53 | 0.02 (0.13) | 0.48 |