TY - JOUR T1 - It Is High Time That We Define Axial Psoriatic Arthritis JF - The Journal of Rheumatology JO - J Rheumatol SP - 1301 LP - 1302 DO - 10.3899/jrheum.200103 VL - 47 IS - 9 AU - VINOD CHANDRAN Y1 - 2020/09/01 UR - http://www.jrheum.org/content/47/9/1301.abstract N2 - Psoriatic arthritis (PsA), one of the spondyloarthritides (SpA), is an inflammatory musculoskeletal disease associated with psoriasis, classified according to the ClASsification for Psoriatic Arthritis (CASPAR) criteria1. PsA is a heterogeneous disease; manifestations vary within and between patients and commonly involve the skin, joints, and occasionally the eye and gastrointestinal tract2. With the aim to better study the most common manifestations of PsA, clinical trials and treatment recommendations have classified the cutaneous and musculoskeletal manifestations into domains3. These include skin, nails, peripheral arthritis, enthesitis, dactylitis, and axial arthritis3. Experts in PsA have largely reached consensus on the definition and tools for assessment of skin, nails, peripheral arthritis, enthesitis, and dactylitis. Recent clinical trials have provided evidence of varying efficacy of interventions for active disease in these domains4.PsA patients with axial arthritis (axPsA) tend to have more severe disease5. Compared to those without axial disease, these patients have higher likelihood of moderate/severe psoriasis, higher disease activity, and greater effect on quality of life and function5. Therefore, determining whether the axial domain is involved may have prognostic value. However, the axial arthritis domain is the least studied; the tools of assessment and treatment recommendations … Address correspondence to V. Chandran, 1E-416, Toronto Western Hospital, 399 Bathurst St., Toronto, Ontario M5T2S8, Canada. E-mail: vinod.chandran{at}uhnresearch.ca. ER -