Fast Five Quiz: How Much Do You Know About Psoriatic Arthritis?

Eric M. Ruderman, MD


December 23, 2021

The patterns of joint involvement that are seen in PsA and which distinguish PsA from other arthritic diseases are as follows:

  • Asymmetrical oligoarticular arthritis (arthritis that affects two or more joints in the first 6 months of disease onset)

  • Distal interphalangeal arthropathy

  • Arthritis mutilans (severe inflammation of joints that often results in joint deformity occurs rarely in patients with PsA, though classification systems vary)

  • Spondylitis with or without sacroiliitis

Other physical exam findings in patients with PsA include enthesitis, dactylitis (also known as "sausage digit"), PsA skin changes (eg, skin lesions), and nail changes (eg, pitting, splitting).

Learn more about the clinical presentation of PsA.


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