Thoracic spine involvement
| Ankylosing spondylitis | Enteropathic spondylitis | Psoriatic spondylitis | Reactive arthritis | |
|---|---|---|---|---|
| Number of films available (no of cases) | 64/91 | 13/31 | 14/34 | 4/7 |
| Worst grade (number (%)) grades 3–4 | 29 (45) | 4 (31) | 5 (36) | 1 (25) |
| Number (%) symmetry5-150 | 24/40 (60) | 4/5 (80) | 2/6 (33) | 0 |
| Paravertebral ossification (number (%)) | 1 (2) | 0 | 0 | 0 |
| Chunky syndesmophytes (number (%))5-150 | 2/40 (5) | 0 | 4/6 (67) | 1/2 (50) |
| Ligamentous calcification (number (%)) | 9 (14) | 0 | 2 (14) | 0 |
| Squaring (number (%)) | 7 (11) | 0 | 0 | 0 |
| Romanus lesions (number (%)) | 9 (14) | 0 | 2 (14) | 1 (25) |
| Spinal pseudarthrosis (number (%)) | 1 (2) | 0 | 0 | 0 |
| Zygoapophyseal ankylosis (number (%)) | 7 (11) | 0 | 0 | 0 |
| Discitis (number (%)) | 4 (6) | 0 | 0 | 0 |
| Bamboo spine (number (%)) | 8 (13) | 2 (15) | 0 | 0 |
↵5-150 Note data on symmetry and syndesmophyte morphology only apply to severity grades 2–4: the number of available films is given by the denominator.