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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

From: Are bone erosions detected by magnetic resonance imaging and ultrasonography true erosions? A comparison with computed tomography in rheumatoid arthritis metacarpophalangeal joints

  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%
  1. 320 MCP joint quadrants were evaluated. CT, computed tomography; MCP, metacarpophalangeal joint; MRI, magnetic resonance imaging; US, ultrasonography.