Psoriasis and Psoriatic Arthritis – The 3% Rule

~ 3% of patients with psoriasis have psoriatic arthritis and ~ 3% will
develop it annually

Clinical Question:
How common is psoriatic arthritis in patients with psoriasis and how often will they develop arthritis?

Bottom Line:
In these 2 studies, approximately 3% of patients with psoriasis have psoriatic arthritis. Among the patients with psoriasis who do not have arthritis, approximately 3% will be given a new diagnosis of psoriatic arthritis each year. Patients with pitted psoriatic
nails and uveitis are at higher risk of developing psoriatic arthritis.
(LOE = 2a)

Reference:
Eder L, Haddad A, Rosen CF, et al. The incidence
and risk factors for psoriatic arthritis in patients with psoriasis: a
prospective cohort study. Arthritis Rheumatol 2016;68(4):915-923. Karreman
MC, Weel AE, van der Ven M, et al. Prevalence of psoriatic arthritis in
primary care patients with psoriasis. Arthritis Rheumatol
2016;68(4):924-931.

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