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Patients with Crohn's disease can develop arthritis of two basic types: arthritis of the spine (spondylitis) and arthritis of joints away from the spine (peripheral arthritis). Spondylitis occurs in approximately 20% of patients with Crohn's disease and the symptoms do not tend to coincide temporally with the activity of the bowel disease. Peripheral arthritis also occurs in around 20% of patients with Crohn's disease, and the flare-ups of joint inflammation tend to coincide with the bowel inflammation.
Psoriatic arthritis is a very inflammatory form of arthritis associated with psoriasis. In the toes, psoriatic arthritis classically features reddish, warm, tender, and painful toes that have soft tissue swelling in the shape of a sausage.
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