Frequency of swollen joints detected by ultrasound (ultrasound-SJ) in each joint site.
| GS ≥ 1 | GS ≥ 2 | GS ≥ 3 | |
|---|---|---|---|
| Joint | No. (%) ultrasound-SJ | No. (%) ultrasound-SJ | No. (%) ultrasound-SJ |
| Shoulder | 30 (13.9) | 10 (4.6) | 6 (2.8) |
| Elbow | 42 (19.4) | 24 (11.1) | 20 (9.3) |
| Wrist | 154 (71.3) | 124 (57.4) | 62 (28.7) |
| 1MCP | 91 (42.1) | 64 (29.6) | 48 (22.2) |
| 2MCP | 125 (57.9) | 89 (41.2) | 76 (35.2) |
| 3MCP | 125 (57.9) | 75 (34.7) | 63 (29.2) |
| 4MCP | 109 (50.5) | 75 (34.7) | 49 (22.7) |
| 5MCP | 103 (47.7) | 69 (31.9) | 51 (23.6) |
| Knee | 54 (25.0) | 26 (12.0) | 16 (7.4) |
GS: grayscale; MCP: metacarpophalangeal.