Fig 2. Cumulative probability plot of radiographic progression for two years in the entire cohort (A) in the subgroup of patients who had syndesmophytes at baseline (B).

With baseline syndesmophytes, patients in the tapering group showed more rapid radiographic progression. All patients with an mSASSS available at each point independently of a two year progression were included; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score.