Table 3 MRI inflammatory and structural lesions according to radiographic grading of sacroiliitis
Radiographic grade | MRI inflammation | MRI structural lesion | ||||
|---|---|---|---|---|---|---|
SPARCC SIJ BME ≥ 2 | SSS > 0 | Erosion > 0 | Fat Metaplasia > 0 | Backfill > 0 | Ankylosis > 0 | |
Bilateral grade 0 | 23/37 (62.2) | 11/38 (28.9) | 10/38 (26.3) | 2/38 (5.3) | 3/38 (7.9) | 0/38 (0) |
Unilateral grade 1 | 25/40 (62.5) | 10/41 (24.4) | 10/41 (24.4) | 2/41 (4.9) | 2/41 (4.9) | 0/41 (0) |
Unilateral grade 2 | 6/6 (100) | 2/6 (33.3) | 1/6 (16.7) | 0/6 (0) | 2/6 (33.3) | 0/6 (0) |
Bilateral grade 1 | 28/41 (68.3) | 15/41 (36.6) | 9/41 (22.0) | 0/41 (0) | 5/41 (12.2) | 2/41 (4.9) |
Unilateral grade 1 and contralateral grade 2 | 46/59 (78.0) | 39/59 (66.1) | 35/59 (59.3) | 11/59 (18.6) | 14/59 (23.7) | 2/59 (3.4) |
P value* | 0.16 | <0.001 | <0.001 | 0.008 | 0.03 | 0.45 |