Fig. 2

Proportion of patients with erosion (a), backfill (b), fat metaplasia (c), and ankylosis (d) on T1 weighted spin echo (T1WSE) magnetic resonance imaging (MRI). ns nonsignificant, SPARCC Spondyloarthritis Research Consortium of Canada, SIJ, sacroiliac joint, BME bone marrow edema, ASAS Assessment of SpondyloArthritis international Society