Specificity and NPV of the VMA and FE lumbar imaging radiographs in detecting radiographic instability across levels, and the prevalence of VMA- and FE-detectable radiographic instability.
| IVR | IVT | |||||
|---|---|---|---|---|---|---|
| Method | Specificity | NPV | Prevalence | Specificity | NPV | Prevalence |
| VMA | 99.4% | 90.7% | 12.3% | 99.1% | 87.4% | 11.9% |
| FE | 98.3% | 72.4% | 6.1% | 98.2% | 71.2% | 5.4% |
| Difference | 1.1% | 18.3% | 6.2% | 0.9% | 16.2% | 6.5% |