	Baseline n (%) (n=145)	2 years n (%) (n=129)	5 years n (%) (n=145)	Positive change over 5 years n (%)	Negative change over 5 years n (%)	Net change n (%)
Structural lesions (cut-offs)
≥3 erosions¶	0 (0.0)	0 (0)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)
≥3 bone spurs¶	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)
≥3 fatty lesions¶	1 (0.7)	2 (1.6)	2 (1.4)	1 (0.7)	0 (0.0)	1 (0.7)
≥5 fatty lesions¶	2 (1.4)	1 (0.8)	1 (0.7)	0 (0.0)	1 (0.7)	−1 (−0.7)
≥5 fatty lesions and/or erosions¶	2 (1.4)	1 (0.8)	1 (0.7)	0 (0.0)	1 (0.7)	−1 (−0.7)

*Paired samples t-test comparing baseline versus 5 years.
†Mean of three readers.
‡Missing data from at least one time point and one reader for four cases.
§Fatty lesions, erosions, bone spurs and ankylosis.
¶Agreement of ≥2 out of 3 readers.
ASAS, Assessment of Spondyloarthritis International Society; BME, bone marrow oedema; SPARCC, Spondyloarthritis Research Consortium of Canada.