Fig. 2From: Changes over time in inflammatory and structural lesions at the sacroiliac joint in children with spondyloarthritis exposed and unexposed to tumor necrosis factor inhibitorUnadjusted trajectory of SSS erosion in all subjects (N = 38). Each solid line begins at a subject’s baseline SSS erosion score and ends at their follow-up score. Dotted lines are the overall fitted regression lines. The TNFi exposure was defined as ≥90 days of use between MRIs. SSS = sacroiliac joint inflammation score; TNFi = tumor necrosis factor inhibitorBack to article page