A study published in the Sao Paulo Medical Journal evaluated the prevalence of psoriatic arthritis among patients with plaque psoriasis.

The researchers retrospectively evaluated data from 300 patients with plaque psoriasis treated at an outpatient clinic in a university center in Juiz de Fora, Brazil. Assessment variables included Psoriasis Area and Severity Index (PASI), family history, age at onset and disease progression, and the Classification Criteria for Psoriatic Arthritis (CASPAR).

In total, 73 patients (24.3%) with plaque psoriasis had psoriatic arthritis. The most common clinical form was asymmetric oligoarthritis in 58.9% of patients, followed by polyarthritis (20.5%), distal interphalangeal arthritis (15.2%) and spondyloarthritis (5.4%). Twenty-two percent of patients had dactylitis and 35.6% had enthesitis. Patients with arthritis were older and had greater family history of psoriasis, longer disease duration, and higher PASI scores.

Source: Sao Paulo Medical Journal https://www.scielo.br/j/spmj/a/Qw7j7fJ575LkDvkfxFDPbMr/?lang=en