Table 1.
Measures of accuracy of GPS signs during evaluation for syndesmotic rotational malreduction models compared to reduced ‘native’ models
| Approach | Syndesmotic malreduction | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Accuracy (%) |
|---|---|---|---|---|---|---|
| Anterior GPS only | ERM model | 87.5 | 12.5 | 50.0 | 50.0 | 50.0 |
| Anterior GPS only | IRM model | 62.5 | 12.5 | 41.6 | 25.0 | 33.3 |
| Posterior GPS only | ERM model | 87.5 | 87.5 | 87.5 | 87.5 | 87.5 |
| Posterior GPS only | IRM model | 75.0 | 87.5 | 87.5 | 77.5 | 81.3 |
| Anterior GPS only | either ERM or IRM model | 75.0 | 12.5 | 63.5 | 20.0 | 54.2 |
| Posterior GPS only | either ERM or IRM model | 56.30 | 87.50 | 90.0 | 50.0 | 66.7 |
ERM, external rotation malreduced
IRM, internal rotation malreduced