Frequency of each imaging feature at individual sites and in all joints and patients
| Imaging feature | MTP1 (n=184) | MTP2 (n=184) | MTP3 (n=184) | MTP4 (n=184) | MTP5 (n=184) | Total (n=920) | Mean (SD) number of joints per patient (n=92) |
|---|---|---|---|---|---|---|---|
| DECT MSU crystal deposition | 70, 38.0% (31.2% to 45.2%) | 21, 11.4% (7.4% to 16.6%) | 13, 7.1% (4.0% to 11.5%) | 9, 4.9% (2.4% to 8.8%) | 40, 21.7% (16.2% to 28.1%) | 153, 16.6% (14.3% to 19.1%) | 2.0 (2.4) |
| Erosion | 146, 79.3% (73.0% to 74.7%) | 29, 15.8% (11.0% to 21.6%) | 12, 6.5% (3.6% to 10.8%) | 11, 6.0% (3.2% to 10.2%) | 64, 34.8% (28.2% to 41.9%) | 262, 28.5% (25.6% to 31.5%) | 2.8 (2.0) |
| Joint space narrowing | 72, 39.1% (32.3% to 46.3%) | 12, 6.5% (3.6% to 10.8%) | 4, 2.2% (0.7% to 5.2%) | 3, 1.6% (0.4% to 4.4%) | 17, 9.2% (5.7% to 14.1%) | 108, 11.7% (9.8% to 13.9%) | 1.2 (1.4) |
| Spur | 74, 40.2% (33.3% to 47.4%) | 4, 2.2% (0.7% to 5.2%) | 3, 1.6% (0.4% to 4.4%) | 1, 0.5% (0.0% to 2.7%) | 25, 12.6% (9.2% to 19.1%) | 107, 11.6% (9.7% to 13.8%) | 1.2 (1.3) |
| Osteophyte | 81, 44.0% (37.0% to 51.3%) | 13, 7.1% (4.0% to 11.5%) | 2, 1.1% (0.2% to 3.5%) | 1, 0.5% (0.0% to 2.7%) | 4, 2.2% (0.7% to 5.2%) | 101, 11.0% (9.1% to 13.1) | 1.1 (1.1) |
| Periosteal new bone formation | 23, 12.5% (8.3% to 17.9%) | 3, 1.6% (0.4% to 4.4%) | 1, 0.5% (0.0% to 2.7%) | 2, 1.1% (0.2% to 3.5%) | 11, 6.0% (3.2% to 10.2%) | 40, 4.3% (3.2% to 5.8%) | 0.4 (0.9) |
| Ankylosis | 0, 0% (0.0% to 1.6%) | 0, 0% (0.0% to 1.6%) | 0, 0% (0.0% to 1.6%) | 0, 0% (0.0% to 1.6%) | 0, 0% (0.0% to 1.6%) | 0, 0% (0.0% to 0.3%) | 0 (0) |
| Sclerosis | 134, 72.8% (66.1% to 78.9%) | 25, 12.6% (9.2% to 19.1%) | 9, 4.9% (2.4% to 8.8%) | 7, 3.8% (1.7% to 7.4%) | 53, 28.8% (22.6% to 35.7%) | 228, 24.8% (22.1% to 27.7%) | 2.5 (1.8) |
Unless stated, data are presented as n, % (95% CI).
DECT, dual-energy CT; MSU, monosodium urate; MTP, metatarsophalangeal.