an estimated 5-7% of all people with psoriasis, and approximately 40% of those with extensive skin disease, have psoriatic arthritis (PsA)
undiagnosed PsA may be prevalent because many asymptomatic people with psoriasis have radiological evidence of joint damage
men and women are equally affected
because of problems in definitively diagnosing PsA, there are few studies on its incidence and prevalence, and the results vary widely depending on the cohort studied and the diagnostic criteria used
PsA has a prevalence of between 0.1% and 1% (1)
may develop at any age including childhood period (2)
incidence peaks between the ages of 30 and 55 years(1)
The condition has a genetic component:
HLA-DR4 is a risk factor for psoriatic and rheumatoid arthritis
patients with psoriatic spondylitis share HLA-B27 with other spondylitic patients
the additional causal factors in psoriatic patients are unknown and may vary between patients
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