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Psoriasis is an important clinical feature in ankylosing spondylitis (AS) and spondyloarthritis (SpA) in general,1 with inflammatory spinal disease developing in 5%–25% of psoriasis cases.2 ,3 However, there have been few studies assessing the differences between AS patients with and without concomitant psoriasis.4–9
Our aim was to compare the demographic, clinical and imaging characteristics between AS patients with and without psoriasis. Baseline data from an 80% random sample of the AS Study for the Evaluation of Recombinant Infliximab Therapy (ASSERT) database were used for this analysis. Details of the ASSERT trial and study population have been previously published.10 Briefly, patients with active AS (fulfilling modified New York criteria) for at least 3 months, a Bath AS disease activity index score of at least 4 (range 0–10) and a spinal pain assessment score of at least 4 (range 0–10) were eligible for the study.
AS patients with …