| Examined bone* | Examined bones†, n | High field MRI | Low field MRI | x ray | |||||||
| Erosions, n | Erosions, n | Sensitivity | Specificity | Accuracy | ICC‡ | Erosions, n | Sensitivity | Specificity | Accuracy | ||
| Base of MC2 | 7 | 7 | 1 | 0.14 | N/A | 0.14 | −0.058§ | 0 | 0.00 | N/A | 0.00 |
| Base of MC3 | 10 | 5 | 1 | 0.20 | 1.00 | 0.60 | 0.110 | 0 | 0.00 | 1.00 | 0.50 |
| Base of MC4 | 9 | 4 | 1 | 0.25 | 1.00 | 0.67 | 0.182 | 0 | 0.00 | 1.00 | 0.56 |
| Trapezoid | 6 | 5 | 1 | 0.20 | 1.00 | 0.33 | 0.854 | 0 | 0.00 | 1.00 | 0.17 |
| Capitate | 7 | 7 | 2 | 0.29 | N/A | 0.29 | 0.492 | 0 | 0.00 | N/A | 0.00 |
| Hamate | 10 | 8 | 4 | 0.50 | 1.00 | 0.60 | −0.009§ | 1 | 0.13 | 1.00 | 0.30 |
| Scaphoid | 7 | 6 | 4 | 0.67 | 1.00 | 0.71 | 0.714 | 0 | 0.00 | 1.00 | 0.14 |
| Lunate | 7 | 7 | 4 | 0.57 | N/A | 0.57 | 0.611 | 0 | 0.00 | N/A | 0.00 |
| Triquetrum | 10 | 10 | 5 | 0.50 | N/A | 0.50 | 0.884 | 0 | 0.00 | N/A | 0.00 |
| Distal radius | 7 | 6 | 5 | 0.83 | 0.00 | 0.71 | 0.407 | 1 | 0.17 | 1.00 | 0.29 |
| Distal ulna | 6 | 5 | 4 | 0.80 | 1.00 | 0.83 | 0.420 | 2 | 0.40 | 1.00 | 0.50 |
| Total | 86 | 70 | 32 | 0.46 | 0.94 | 0.55 | 0.689 | 4 | 0.06 | 1.00 | 0.23 |
ICC, intraclass correlation coefficient; MC, metacarpal; NA, not applicable.
*Bony sites excluded from scoring included the base of metacarpals 1 and 5, trapezium and pisiform as these are infrequently visualised.
†Where complete data for all three imaging modalities available for comparison.
‡p<0.001.
§Intraclass correlation coefficient negative due to slight inverse relation between high and low field scores for these sites (indicating poor agreement).