Key clinical point: Axial spondyloarthritis (axSpA) with or without concomitant psoriasis and axial psoriatic arthritis (PsA) appear distinct entities based on marked demographic, clinical, and genetic differences.
Major finding: Patients with axial PsA vs axSpA with or without psoriasis were older at symptom onset (48.6 vs 44.7 or 41.4 years, respectively; P < .001), had a higher prevalence of dactylitis (43.2% vs 18.3% or 8.4%, respectively; P < .001) and peripheral arthritis (86.7% vs 58.1% or 44.3%, respectively; P < .001), and were less frequently HLA-B27 positive (22.3% vs 55.4% or 65.5%, respectively; P < .001).
Study details: This study included 5208 patients with axSpA (with or without psoriasis) and 2771 with PsA (axial or peripheral arthritis) from the Swiss Clinical Quality Management (SCQM) registry.
Disclosures: This study was funded by Eli Lilly. Two authors declared being employees of SCQM with salary partly financed by Eli Lilly. Several authors declared receiving honoraria, speaking or consulting fees, research grants, or other financial support from various sources, including Lilly and other SCQM supporters. Two authors declared no conflicts of interest.
Source: Ciurea A et al. Characterisation of patients with axial psoriatic arthritis and patients with axial spondyloarthritis and concomitant psoriasis in the SCQM registry. RMD Open. 2023;9:e002956 (Jun 5). doi: 10.1136/rmdopen-2022-002956