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Table 2 Sensitivity, specificity and accuracy of radiography, MRI and US for bone erosions, with CT as 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 18 18 13 3 9 5 8 4 78
Quadrants with radiographic erosions 7 7 0 0 1 0 1 0 16
Quadrants with MRI erosions 19 11 16 0 7 2 8 1 64
Quadrants with US erosions 25 11 4 1 3 0 9 2 55
Radiography sensitivity 33% 39% 0% 0% 11% 0% 13% 0% 19%
Radiography specificity 96% 100% 100% 100% 100% 100% 100% 100% 100%
Radiography accuracy 69% 74% 69% 93% 81% 88% 83% 90% 81%
MRI sensitivity 83% 61% 85% 0% 78% 40% 75% 25% 68%
MRI specificity 83% 100% 83% 100% 100% 100% 94% 100% 96%
MRI accuracy 83% 83% 83% 93% 95% 93% 90% 93% 89%
US sensitivity 94% 33% 8% 0% 33% 0% 63% 25% 42%
US specificity 67% 79% 90% 97% 100% 100% 88% 97% 91%
US accuracy 79% 59% 64% 90% 86% 88% 83% 90% 80%
  1. In total, 336 MCP joint quadrants were evaluated. CT, computed tomography; MCP, metacarpophalangeal joint; MRI, magnetic resonance imaging; US, ultrasonography.