Fig. 1From: Changes over time in inflammatory and structural lesions at the sacroiliac joint in children with spondyloarthritis exposed and unexposed to tumor necrosis factor inhibitorUnadjusted SIS trajectory of all subjects (N = 45). Each solid line begins at a subject’s baseline SIS 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. SIS = sacroiliac joint inflammation score; TNFi = tumor necrosis factor inhibitorBack to article page