Table 2.
Prevalence of apophyseal joint synovitis in ERA cases*
| Apophyseal synovitis grade | Cases, no. | Synovitis plus definite enhancement of posterior elements | Synovitis plus sacroiliitis | Synovitis plus indeterminate SI joints | Synovitis plus normal SI joints |
|---|---|---|---|---|---|
| Grade 3 | 5 | 80 (4/5) | 100 (5/5) | 0 (0/5) | 0 (0/5) |
| Grade 2 | 9 | 33 (3/9) | 89 (8/9) | 11 (1/9) | 0 (0/9) |
| Grade 1 | 8 | 38 (3/8) | 50 (4/8) | 25 (2/8) | 25 (2/8) |
| Grade 0 | 36 | 14 (5/36) | 78 (28/36) | 8 (3/36) | 14 (5/36) |
Values are the percentage (number/total number) unless indicated otherwise. ERA = enthesitis-related arthritis; SI = sacroiliac.