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Table 1 Number of quadrants with bone erosions in finger joints, stratified by imaging modality and combinations thereof

From: Ultrasonography of the metacarpophalangeal and proximal interphalangeal joints in rheumatoid arthritis: a comparison with magnetic resonance imaging, conventional radiography and clinical examination

Joint Quadrants with erosions Quadrants with no erosions on US, MRI or CR Agreement Sensitivity Specificity
  US + MRI + CR US + MRI MRI + RAD US + CR US only MRI only CR only   US versus MRI (%) CR versus MRI (%) US CR US CR
MCP 2nd 10 10 2 1 2 7 3 205 225(94) 217(90) 0.64 0.41 0.98 0.98
   Est. 9 8 2 1 1 2 2 55 72(90) 66(82)     
   Early 1 2 0 0 1 2 0 74 77(96) 75(94)     
   Control 0 0 0 0 0 3 1 76 76(95) 76(95)     
MCP 3rd 7 7 4 1 4 12 2 230 217(90) 214 (89) 0.47 0.37 0.97 0.98
   Est. 6 6 4 1 3 6 2 52 64(80) 62 (78)     
   Early 1 1 0 0 1 2 0 75 77(96) 76 (95)     
   Control 0 0 0 0 0 4 0 76 76(95) 76 (95)     
MCP 4th 5 2 0 1 1 5 0 222 229 (97) 227 (96) 0.58 0.42 0.99 0.99
   Est. 4 1 0 1 1 5 0 64 69 (91) 68 (89)     
   Early 1 1 0 0 0 0 0 78 80 (100) 79 (99)     
   Control 0 0 0 0 0 0 0 80 80 (100) 80 (100)     
MCP 5th 7 1 0 1 3 2 1 221 229 (97) 228 (97) 0.80 0.70 0.98 0.99
   Est. 6 0 0 1 2 0 0 67 73 (96) 73 (96)     
   Early 1 1 0 0 1 0 1 76 78 (97) 77 (96)     
   Control 0 0 0 0 0 2 0 78 78 (97) 78 (97)     
PIP 2nd 0 0 0 0 6 1 1 212 212 (96) 212 (96) - - 0.97 0.99
   Est. 0 0 0 0 5 0 1 54 54 (90) 54 (90)     
   Early 0 0 0 0 1 0 0 79 79 (99) 79 (99)     
   Control 0 0 0 0 0 1 0 79 79 (99) 79 (99)     
PIP 3rd 1 0 0 1 7 1 0 210 211 (96) 211 (96) 0.50 0.50 0.96 0.99
   Est. 1 0 0 1 6 1 0 51 52 (87) 52 (87)     
   Early 0 0 0 0 1 0 0 79 79 (99) 79 (99)     
   Control 0 0 0 0 0 0 0 80 80 (100) 80 (100)     
PIP 4th 0 0 0 0 2 1 1 216 216 (98) 216(98) - - 0.99 0.99
   Est. 0 0 0 0 2 0 1 57 57 (95) 57 (95)     
   Early 0 0 0 0 0 1 0 79 79 (99) 79 (99)     
   Control 0 0 0 0 0 0 0 80 80 (100) 80 (100)     
PIP 5th 0 0 0 0 1 0 4 215 215 (98) 215(98) - - 0.99 0.98
   Est. 0 0 0 0 0 0 2 58 58 (97) 58(97)     
   Early 0 0 0 0 1 0 2 77 77 (96) 77(96)     
   Control 0 0 0 0 0 0 0 80 80 (100) 80 (100)     
Total 30 20 6 5 26 29 12 1,704 1,754 (96) 1,740 (95) 0.59 0.42 0.98 0.99
   Est. 26 15 6 5 20 14 8 458 499 (90) 490 (89)     
   Early 4 5 0 0 6 5 3 617 626 (98) 621 (97)     
   Control 0 0 0 0 0 10 1 629 629 (98) 629 (98)     
  1. The following numbers of joints were evaluated (1,832 in total): 240 MCP second, 240 MCP third, 236 MCP fourth, 236 MCP sixth, 220 PIP second, 220 PIP third, 220 PIP fourth, and 220 PIP fifth. All study participants included. CR, conventional radiography; early, early rheumatoid arthritis; Est., established rheumatoid arthritis; MCP, metacarpophalangeal joint; MRI, magnetic resonance imaging; PIP, proximal interphalangeal joint; US, ultrasonography.