Asymmetrical oligoarticular arthritis was previously thought to be the most common type of psoriatic arthritis. The digits of the hands and feet are usually affected first, with inflammation of the flexor tendon and synovium occurring simultaneously, leading to the typical "sausage" appearance (dactylitis) of the fingers and toes. A large joint, such as the knee, is also commonly involved. Usually, fewer than five joints are affected at any one time.
For more on the different forms of psoriatic arthritis, read here.
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Cite this: Herbert S. Diamond. Fast Five Quiz: How Much Do You Know About Psoriatic Arthritis? - Medscape - Jun 13, 2016.