Clinical features of juvenile psoriatic arthritis
What are the demographic and clinical characteristics of juvenile psoriatic arthritis?
• Peak age of onset: bimodal, 2 to 4 years and 10 to 12 years.
• Gender ratio: younger cohort more female predominant, older onset patients have equal sex distribution.
• Diagnosis is based on the presence of psoriasis and arthritis or arthritis and two out of three of the following criteria:
• Nail pitting (minimum two pits on more than one nail) or oncholysis
• Psoriasis in a first-degree relative.
• Arthritis pattern can include oligoarticular, polyarticular, or axial arthritis (sacroiliitis and enthesitis).
• Younger cohort of patients tend to be similar to oligoarticular JIA with female predominance, ANA positivity, and increased risk for anterior uveitis, but differ in having more dactylitis, finger, toe, and wrist involvement.
Treatment similar to oligoarticular, polyarticular, or ERA subgroups of JIA depending on presentation and severity.