Axial Involvement in Psoriatic Arthritis: Effect on Peripheral Arthritis and Differential Features With Axial Spondyloarthritis in South America

This is the authors' abstract. We don't add key points for this paper.

To the Editor: Reported data of axial involvement in psoriatic arthritis (PsA) are variable (25–70%). This variability is mainly linked to different ways of defining this feature. Gladman1 established that the prevalence of axial involvement in PsA was close to 50% and that it is associated with HLA-B27. Likewise, psoriasis (PsO) spondylitis, unlike ankylosing spondylitis (AS), is characterized by not having a greater preponderance of the male sex, greater skin involvement, and a less severe course.2 We carried out an observational, cross-sectional, single-center study. The objective of our study was to estimate the frequency of axial involvement in patients with a recent diagnosis of PsA in a rapid diagnostic circuit called Reuma-Check3 and to carry out a comprehensive characterization (clinical, laboratory, and images). We also aimed to analyze the effect of axial involvement on other manifestations, and finally, to compare all features with a group of patients with axial spondyloarthritis (axSpA), diagnosed in the same circuit (with the same evaluators and the same imaging and laboratory techniques) in the same period of time, who did not present current PsO or history of PsO. This observational study was approved by an institutional ethics committee and was conducted in accordance with the current Declaration …