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Table 3 Sensitivity, specificity and accuracy of MRI and US for bone erosions in regions without radiographic erosions, with CT as the reference
| MCP 2 | MCP 3 | MCP 4 | MCP 5 | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
| Proximal | Distal | Proximal | Distal | Proximal | Distal | Proximal | Distal | ||
| Quadrants with CT erosions | 12 | 11 | 13 | 3 | 8 | 5 | 7 | 4 | 63 |
| Quadrants with MRI erosions | 12 | 6 | 16 | 0 | 7 | 2 | 7 | 1 | 51 |
| Quadrants with US erosions | 18 | 5 | 4 | 1 | 2 | 0 | 8 | 2 | 40 |
| MRI sensitivity | 75% | 55% | 85% | 0% | 88% | 40% | 71% | 25% | 65% |
| MRI specificity | 87% | 100% | 83% | 100% | 100% | 100% | 94% | 100% | 96% |
| MRI accuracy | 83% | 86% | 83% | 93% | 98% | 93% | 90% | 93% | 90% |
| US sensitivity | 92% | 0% | 8% | 0% | 25% | 0% | 57% | 25% | 30% |
| US specificity | 70% | 79% | 90% | 97% | 100% | 100% | 88% | 97% | 92% |
| US accuracy | 77% | 54% | 64% | 90% | 85% | 88% | 83% | 90% | 80% |
