Sacroiliitis, symphisitis, pelvic enthesitis, and hip involvement
| Ankylosing spondylitis | Enteropathic spondylitis | Psoriatic spondylitis | Reactive arthritis | |
|---|---|---|---|---|
| Number of films available (no of cases) | 91/91 | 31/31 | 34/34 | 7/7 |
| Worst SI grade (number (%)) grades 3–4 | 84 (92) | 30 (97) | 28 (82) | 7 (100) |
| Symmetry (number (%)) | 77 (85) | 31 (100) | 25 (74) | 3 (43) |
| Symphisitis (number (%)) grades 3–4 | 27 (31) | 9 (30) | 8 (25) | 1 (14) |
| Iliac enthesitis (number (%)) grades 3–4 | 6 (7) | 1 (4) | 1 (4) | 0 |
| Ischial enthesitis (number (%)) grades 3–4 | 25 (30) | 4 (14) | 6 (22) | 0 |
| Hip involvement (number (%)) grades 3–4 | 22 (26) | 4 (14) | 7 (23) | 0 |