No. of bones with erosions | Sensitivity* | Specificity* | Accuracy* | Bone coverage by MagneVu† | ||||||||||
Artoscan | MagneVu | CR | MagneVu | CR | MagneVu | CR | MagneVu | CR | 0% | 1–33% | 34–66% | 67–99% | 100% | |
MH 2 | 5 | 5 | 3 | 1.0 | 0.6 | 1.0 | 1.0 | 1.0 | 0.89 | 0 | 0 | 26.2 | 73.7 | 0 |
PB 2 | 3 | 3 | 2 | 0.67 | 0.67 | 0.62 | 1.0 | 0.89 | 0.95 | 0 | 0 | 0 | 73.7 | 26.3 |
MH 3 | 3 | 4 | 1 | 1.0 | 0.33 | 0.94 | 1.0 | 0.95 | 0.89 | 0 | 0 | 26.2 | 73.7 | 0 |
PB 3 | 1 | 1 | 1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0 | 0 | 0 | 84.2 | 15.8 |
MH 4 | 3 | 1 | 2 | 0.67 | 0.67 | 1.0 | 1.0 | 0.95 | 0.95 | 0 | 0 | 15.8 | 78.9 | 5.3 |
PB 4 | 1 | 1 | 1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0 | 0 | 0 | 63.2 | 36.8 |
MH 5 | 5 | 3 | 3 | 0.6 | 0.2 | 1.0 | 0.86 | 0.89 | 0.68 | 5.3‡ | 0 | 0 | 78.9 | 15.8 |
PB 5 | 1 | 1 | 1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 5.3‡ | 0 | 5.3 | 42.1 | 47.4 |
All MH | 16 | 13 | 9 | 0.81 | 0.44 | 0.98 | 0.97 | 0.95 | 0.86 | 1.3‡ | 0 | 17.1 | 76.3 | 5.3 |
All PB | 6 | 6 | 6 | 0.83 | 0.83 | 0.99 | 1.0 | 0.97 | 0.99 | 1.3‡ | 0 | 1.3 | 65.8 | 31.6 |
All MH and PB | 22 | 19 | 15 | 0.82 | 0.55 | 0.98 | 0.98 | 0.96 | 0.92 | 1.3‡ | 0 | 9.2 | 71.1 | 18.5 |
*Sensitivity, specificity and accuracy for CR/MagneVu was assessed with Artoscan MRI as the standard reference. †Values indicate the proportion of bones, which were covered 0%, 1–33%, 34–66%, 67–99% and 100%, respectively, by the MagneVu examination. ‡The MagneVu did not visualise MH 5 in one patient due to suboptimal positioning.
CR, conventional radiography; mm, metacarpal head; PB, phalangeal bases.