Association of pain with site and grade of osteophyte. Odds ratios (OR) for pain are for different cut off levels of abnormality (for example, ⩾grade 1 v grade 0, etc)
| Site | Grade | OR for pain (95% CI) | Sensitivity (%) | Specificity (%) | Efficiency (%) |
|---|---|---|---|---|---|
| PFJ lateral | ⩾1 | 2.7 (1.9, 4.1) | 51.2 | 71.9 | 61.6 |
| ⩾2 | 5.6 (2.4, 12.8) | 12.9 | 96.8 | 54.9 | |
| ⩾3 | 5.6 (1.2, 25.2) | 5.0 | 99.1 | 52.1 | |
| PFJ medial | ⩾1 | 3.2 (2.1, 4.8) | 45.2 | 79.4 | 62.3 |
| ⩾2 | 11.7 (2.7, 50.5) | 10.0 | 99.1 | 54.6 | |
| ⩾3 | 3-150 | 0.4 | 100 | 50.2 | |
| Maximum PFJ grade | ⩾1 | 2.6 (1.8, 3.8) | 58.9 | 64.3 | 61.6 |
| ⩾2 | 6.1 (2.9, 12.8) | 21.3 | 95.8 | 58.6 | |
| ⩾3 | 6.1 (1.4, 27.2) | 5.4 | 99.1 | 52.3 | |
| TFJ medial tibial | ⩾1 | 3.2 (1.7, 5.3) | 19.7 | 93 | 56.4 |
| ⩾2 | 18.3 (2.4, 137) | 7.9 | 99.5 | 53.7 | |
| ⩾3 | 3-150 | 1.2 | 100 | 50.6 | |
| TFJ lateral tibial | ⩾1 | 3.9 (1.9, 7.8) | 17.6 | 94.9 | 56.3 |
| ⩾2 | 16.2 (2.1, 123.0 | 7.1 | 99.5 | 53.3 | |
| ⩾3 | 5.5 (0.6, 45.7) | 2.5 | 99.5 | 51.0 | |
| TFJ medial femoral | ⩾1 | 3.0 (1.7, 5.3) | 21.7 | 91.6 | 56.7 |
| ⩾2 | 7.8 (2.7, 24.50 | 12.9 | 98.2 | 55.6 | |
| ⩾3 | 10.2 (1.3, 79.9) | 4.6 | 95.5 | 50.1 | |
| TFJ lateral femoral | ⩾1 | 2.6 (1.5, 4.5) | 20.1 | 91.1 | 55.6 |
| ⩾2 | 4.3 (1.4, 12.8) | 7.5 | 98.2 | 52.9 | |
| ⩾3 | 3.6 (0.4, 32.5) | 1.6 | 95.5 | 48.6 | |
| Maximum TFJ grade | ⩾1 | 2.9 (1.9, 4.5) | 38.1 | 82.7 | 60.4 |
| ⩾2 | 6.6 (3.1, 14.3) | 20.5 | 96.3 | 58.4 | |
| ⩾3 | 6.0 (1.8, 20.7) | 7.9 | 98.6 | 53.3 | |
| Maximum grade whole knee | ⩾1 | 2.5 (1.6, 3.4) | 62.3 | 58.7 | 60.5 |
| ⩾2 | 5.2 (2.9, 9.3) | 29.7 | 92.5 | 61.1 | |
| ⩾3 | 5.5 (2.1, 14.6) | 11.1 | 97.7 | 54.4 |
↵3-150 Denominator zero therefore unable to calculate simple odds ratios.