| U/S | Interpretation | Clinical examination | |
| Improved (N = 25) | Not improved (N = 15) | ||
| Improved (N = 9) | 7 | 2 | |
| Not improved (N = 31) | 18 | 13 | |
| Sensitivity | 28% | ||
| Specificity | 86.7% | ||
| PPV | 77.8% | ||
| NPV | 41.9% | ||