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Table 3 MRI inflammatory and structural lesions according to radiographic grading of sacroiliitis

From: MRI evidence of structural changes in the sacroiliac joints of patients with non-radiographic axial spondyloarthritis even in the absence of MRI inflammation

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
  1. Values are n/N (%). BME bone marrow edema, MRI magnetic resonance imaging, SIJ sacroiliac joint, SPARCC Spondyloarthritis Research Consortium of Canada, SSS sacroiliac joint structural score
  2. *Cochran-Mantel-Haenszel test P value for general association