General
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• Affects 5-10% of psoriasis population, usually ages 35-45 years
• Onset or exacerbation may be associated with trauma (Can Fam Physician 2012;58:e636)
• First affects DIP of hands and feet; similar to rheumatoid arthritis but milder
• Inflammation of digital tendon sheaths causes sausage fingers
• Also causes conjunctivitis, iritis

Case reports
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• 29 year old woman with psoriasis and painful and swollen distal and proximal interphalyngeal joints (J Zhejiang Univ Sci B 2010;11:779)

Clinical images
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Psoriasis rash

Psoriatic arthritis of hands

Swollen and erythematous third digit

Swollen joints

Micro description
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• Similar to rheumatoid arthritis but tends to be more fibrotic

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