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Table 2 Distribution of erosions in different region of interest according to CT and US, and sensitivity, specificity, accuracy and k values for high-resolution US in detecting erosion (grading from 0 to 3) at different joint sites using CT as the reference method

From: Ultrasonographic assessment of bone erosions in the different subtypes of systemic lupus erythematosus arthritis: comparison with computed tomography

  Quadrants CT-detected erosions US-detected erosions Sensitivity (%) Specificity (%) Exact agreement (%) k values (95 % CI)
Second metacarpal head 156 27 (17.3) 21 (13.5) 51.9 95.3 87.8 0.63 (0.43 to 0.83)
 Dorsal 52 16 (30.8) 13 (25.0) 56.3 88.9 78.8 0.51 (0.26 to 0.75)
 Lateral 52 11 (21.2) 8 (15.4) 54.5 95.1 86.5 0.77 (0.54 to 1.00)
 Volar 52 0 0 NC NC NC NC
Third metacarpal head 104 15 (14.4) 4 (3.8) 20.0 98.9 87.5 0.26 (0.03 to 0.48)
 Dorsal 52 14 (21.2) 4 (15.4) 21.4 97.4 76.9 0.24 (0.02 to 0.46)
 Volar 52 1 (1.9) 0 0 100 98.1 0 (0.00 to 0.00)
Fourth metacarpal head 104 7 (6.7) 1 (0.9) 14.3 100 94.2 0.19 (-0.12 to 0.51)
 Dorsal 52 6 (11.5) 1 (1.9) 17.0 100 90.4 0.08 (-0.09 to 0.26)
 Volar 52 1 (1.9) 0 0 100 98.1 0 (0.00 to 0.00)
Fifth metacarpal head 156 8 (5.1) 6 (3.8) 50.0 100 96.3 0.77 (0.66 to 0.89)
 Dorsal 52 6 (11.5) 4 (7.7) 66.7 100 96.2 0.73 (0.56 to 0.90)
 Lateral 52 2 (3.8) 2 (3.8) 100 100 100 0.85 (0.74 to 0.97)
 Volar 52 0 0 NC NC NC NC
Radiocarpal 104 18 (17.3) 6 (5.8) 33.0 100 88.5 0.57 (0.30 to 0.83)
 Dorsal 52 15 (28.8) 4 (7.7) 26.7 100 78.8 0.48 (0.16 to 0.80)
 Lateral 52 3 (5.7) 2 (3.8) 66.7 100 98.1 0.79 (0.39 to 1.0)
Ulnar head 104 17 (16.3) 5 (4.8) 23.5 98.9 86.5 0.29 (0.05 to 0.54)
 Dorsal 52 13 (25.0) 4 (7.7) 23.1 97.4 78.8 0.23 (-0.03 to 0.50)
 Lateral 52 4 (7.7) 1 (1.9) 25.0 100 94.2 0.38 (-0.15 to 0.91)
Total 728 92 (12.6) 43 (5.9) 35.9 98.7 90.8 0.50 (0.36 to 0.63)
  1. Unless otherwise specified, values are the number of patients (values in brackets are percentage). CT computed tomography, US ultrasound, NC not computable