psoriatic arthritis

Psoriatic arthritis (also arthropathic psoriasis or psoriatic arthropathy)) is a type of inflammatory arthritis that affects around 5-7% (according to Oxford Handbook of Clinical Medicine) of people suffering from the chronic skin condition psoriasis. It occurs more commonly in patients with tissue type HLA-B27. Treatment of psoriatic arthritis is similar to that of rheumatoid arthritis. More than 80% of patients with psoriatic arthritis will have psoriatic nail lesions characterised by pitting of the nails, or more extremely, loss of the nail itself (onycholysis). Psoriatic arthritis is said to be a seronegative spondyloarthropathy.
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Psoriatic arthritis is a form of arthritic joint disease associated with the chronic skin scaling and fingernail [more]Psoriatic arthritis - Community and Resources

Noun
1. a form of rheumatoid arthritis usually affecting fingers and toes and associated with psoriasis
(hypernym) rheumatoid arthritis, atrophic arthritis, rheumatism

Joint inflammation associated with psoriasis. Psoriatic arthritis is a potentially destructive and deforming form of arthritis that affects approximately 10% of persons with psoriasis.