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 | ||