Bone erosions and bone marrow oedema in wrist and MCP joint bones. Performance of low field MRI and x ray examination when high field MRI is considered as standard reference
| Examined bones (n) | Bone erosions | Bone marrow oedema | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High field MRI | Low field MRI | x Ray examination | High field MRI | Low field MRI | ||||||||||||
| (No) | (No) | Sens(%) | Spec (%) | Acc (%) | ICC* | (No) | Sens(%) | Spec (%) | Acc (%) | (No) | (No) | Sens(%) | Spec(%) | Acc (%) | ICC** | |
| *p<0.005; **p<0.05; †not computable; ‡not significant. | ||||||||||||||||
| Sens, sensitivity; Spec, specificity; Acc, accuracy; ICC, intraclass correlation coefficient. Note: Eight people had a limb size that precluded MRI examination of the MCP joints owing to the size of the FOV; MCP, metacarpophalangeal; MCP prox, the head of the metacarpal bone; MCP dist, the base of the phalanx; Base, base of the metacarpal bone. | ||||||||||||||||
| 2nd MCP prox. (57) | 21 | 22 | 100 | 97 | 98 | 0.991 | 8 | 32 | 100 | 74 | 13 | 9 | 62 | 98 | 89 | 0.853 |
| 2nd MCP dist. (57) | 9 | 14 | 100 | 90 | 91 | 0.965 | 7 | 50 | 96 | 89 | 5 | 0 | 0 | 100 | 91 | † |
| 3rd MCP prox. (57) | 18 | 21 | 100 | 92 | 95 | 0.947 | 5 | 26 | 100 | 78 | 10 | 3 | 30 | 100 | 88 | 0.604 |
| 3rd MCP dist. (57) | 8 | 8 | 100 | 100 | 100 | 0.951 | 4 | 38 | 98 | 91 | 2 | 1 | 50 | 100 | 98 | 0.665 |
| 4th MCP prox. (57) | 11 | 11 | 91 | 98 | 96 | 0.907 | 3 | 23 | 100 | 85 | 3 | 2 | 33 | 98 | 95 | 0.264‡ |
| 4th MCP dist. (57) | 4 | 4 | 75 | 98 | 96 | 0.915 | 4 | 60 | 98 | 95 | 1 | 0 | 0 | 100 | 98 | † |
| 5th MCP prox. (57) | 12 | 12 | 92 | 98 | 96 | 0.969 | 4 | 31 | 100 | 86 | 7 | 2 | 29 | 100 | 91 | 0.591 |
| 5th MCP dist. (57) | 6 | 5 | 83 | 100 | 98 | 0.966 | 4 | 67 | 100 | 97 | 2 | 0 | 0 | 100 | 96 | † |
| Radius (65) | 17 | 19 | 100 | 96 | 97 | 0.884 | 4 | 24 | 100 | 80 | 5 | 1 | 20 | 100 | 94 | 0.660 |
| Ulna (65) | 28 | 28 | 96 | 97 | 97 | 0.940 | 9 | 29 | 97 | 89 | 6 | 4 | 50 | 98 | 94 | 0.350 |
| Scaphoid (65) | 21 | 19 | 81 | 95 | 91 | 0.947 | 12 | 57 | 100 | 86 | 10 | 5 | 40 | 98 | 89 | 0.682 |
| Lunate (65) | 23 | 24 | 96 | 95 | 95 | 0.968 | 8 | 35 | 100 | 77 | 8 | 4 | 38 | 98 | 91 | 0.139‡ |
| Triquetrum (65) | 20 | 24 | 90 | 87 | 88 | 0.957 | 5 | 20 | 98 | 74 | 2 | 2 | 50 | 98 | 97 | 0.564 |
| Pisiform (65) | 5 | 7 | 100 | 97 | 97 | 0.819 | 6 | 60 | 95 | 92 | 1 | 0 | 0 | 98 | 98 | 0.000‡ |
| Trapezium (65) | 16 | 20 | 100 | 92 | 94 | 0.974 | 7 | 25 | 94 | 77 | 3 | 1 | 33 | 100 | 97 | 0.899 |
| Trapezoid (65) | 11 | 16 | 91 | 89 | 89 | 0.976 | 4 | 36 | 100 | 89 | 2 | 1 | 50 | 100 | 98 | 0.663 |
| Capitate (65) | 32 | 40 | 100 | 76 | 88 | 0.955 | 7 | 22 | 100 | 62 | 6 | 6 | 67 | 97 | 94 | 0.496 |
| Hamate (65) | 13 | 21 | 100 | 85 | 88 | 0.959 | 7 | 46 | 98 | 88 | 3 | 3 | 100 | 100 | 100 | 0.959 |
| 1st Base (65) | 9 | 13 | 100 | 93 | 94 | 0.873 | 2 | 22 | 100 | 89 | 2 | 1 | 50 | 100 | 98 | 0.544 |
| 2nd Base (65) | 14 | 17 | 93 | 92 | 92 | 0.935 | 3 | 21 | 100 | 83 | 3 | 3 | 67 | 98 | 97 | 0.907 |
| 3rd Base (65) | 9 | 11 | 89 | 95 | 94 | 0.972 | 3 | 33 | 100 | 91 | 3 | 4 | 100 | 98 | 98 | 0.890 |
| 4th Base (65) | 9 | 10 | 100 | 98 | 98 | 0.833 | 2 | 22 | 100 | 89 | 4 | 2 | 50 | 100 | 97 | 0.875 |
| 5th Base (65) | 2 | 4 | 100 | 97 | 97 | 0.929 | 5 | 0 | 92 | 89 | 1 | 1 | 0 | 98 | 97 | -0.013‡ |
| Total (1431) | 318 | 370 | 94 | 93 | 94 | 0.936 | 123 | 33 | 98 | 83 | 102 | 55 | 39 | 99 | 95 | - |