Proportion of ERA patients with synovitis or tenosynovitis as identified by US or MRI in the different joint and tendon regions. Data are n (%).
| Characteristic | US, n = 30 | MRI, n = 30 | p* |
|---|---|---|---|
| Carpal | 19 (63.3) | 26 (86.7) | 0.037 |
| MCP 2–5 | 13 (43.3) | 23 (76.7) | 0.000 |
| PIP 2–5 | 16 (53.3) | 26 (86.7) | 0.005 |
| Extensor | 12 (40) | 20 (66.7) | 0.038 |
| Flexor | 15 (50) | 26 (86.7) | 0.002 |
↵* Chi-squared test. Carpal indicates carpal synovitis, including radioulnar, radiocarpal, and intercarpal-carpometacarpal joints. MCP 2–5 is the second through fifth metacarpophalangeal joints. PIP 2–5 is second through fifth proximal interphalangeal joints. Extensor is the 6 extensor tendon groups on the dorsal side of the wrist. Flexor is 6 tendon groups on the ventral side of the wrist and hand. ERA: early rheumatoid arthritis; MRI: magnetic resonance imaging. US: ultrasound.