Table 1.
Reproducibility results showing the difference in calculated component angular alignment across two cases performed by three engineers at two different time points. The maximum average difference for each case and a 95% confidence interval are shown for all three axes of rotation for the femoral and tibial components
| Case | Operator | Run | Femoral component alignment | Tibial component alignment | ||||
|---|---|---|---|---|---|---|---|---|
| F/E | V/V | IE | F/E | V/V | IE | |||
| Case 1 | Sim Eng A | Run 1 | 1.1 | − 0.6 | − 0.8 | 7.1 | 0.6 | 5.9 |
| Case 1 | Sim Eng A | Run 2 | 1.0 | − 0.5 | − 1.2 | 7.0 | 0.4 | 6.2 |
| Case 1 | Sim Eng B | Run 1 | 1.0 | − 0.8 | − 1.5 | 7.0 | 0.5 | 4.5 |
| Case 1 | Sim Eng B | Run 2 | 0.8 | − 0.7 | − 0.8 | 7.4 | 0.4 | 4.7 |
| Case 1 | Sim Eng C | Run 1 | 1.1 | − 0.6 | − 1.8 | 6.9 | 0.8 | 5.5 |
| Case 1 | Sim Eng C | Run 2 | 1.1 | − 0.4 | − 1.0 | 7.2 | 0.6 | 5.9 |
| Maximum difference from average (°) ± 95% CI | 0.2 ± 0.1 | 0.2 ± 0.1 | 0.5 ± 0.3 | 0.3 ± 0.1 | 0.2 ± 0.1 | 0.9 ± 0.6 | ||
| Case 2 | Sim Eng A | Run 1 | 1.9 | − 0.9 | 0.1 | 8.2 | 1.5 | 3.0 |
| Case 2 | Sim Eng A | Run 2 | 2.3 | − 0.8 | − 0.1 | 7.7 | 1.8 | 2.7 |
| Case 2 | Sim Eng B | Run 1 | 2.3 | − 0.7 | − 0.2 | 7.9 | 1.7 | 1.7 |
| Case 2 | Sim Eng B | Run 2 | 2.1 | − 0.8 | 0.4 | 8.4 | 1.4 | 2.8 |
| Case 2 | Sim Eng C | Run 1 | 2.0 | − 0.7 | − 0.2 | 7.9 | 1.0 | 2.3 |
| Case 2 | Sim Eng C | Run 2 | 1.8 | − 0.8 | 0.0 | 8.4 | 1.5 | 2.8 |
| Maximum difference from average (°) ± 95% CI | 0.3 ± 0.2 | 0.1 ± 0.1 | 0.3 ± 0.2 | 0.3 ± 0.2 | 0.4 ± 0.2 | 0.7 ± 0.4 | ||