Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of various aspects of the PE for detecting arthritis as compared to US.
| Sensitivity, % | Specificity, % | PPV, % | NPV, % | |
|---|---|---|---|---|
| Non-bony swelling (NBS) | 45 | 89 | 85 | 66 |
| Limitation of motion (LOM) WITH pain on motion (POM) or tenderness to palpation (TTP) | 54 | 92 | 88 | 65 |
| Either (1) NBS or (2) LOM with POM or TTP | 64 | 86 | 83 | 70 |
| Both (1) NBS and (2) LOM with POM or TTP | 46 | 100 | 100 | 64 |
| Knees active by either criteria | 69 | 100 | 100 | 50 |
| Ankles active by either criteria | 50 | 82 | 50 | 82 |