The incidence of arthritis in psoriatics is probably five times that of the normal population.
In addition, there are many other variants of arthritis found in psoriatics.
Classical psoriatic arthritis involves the digits of an affected finger, where there is a sausage like swelling of the affected digit. Digital arthritis is particularly common in chronic pustular psoriasis of the fingertips, acrodermatitis continua of Hallopeau.
Patients may also have a rheumatoid-like arthritis with a negative rheumatoid factor. Psoriatics can also develop an axial arthritis, psoriatic spondylitis.
- Arthritis associated with psoriasis responds well to oral methotrexate 2.5-5 mg q12h x 3 once a week. This treatment regimen treats both the psoriasis and the psoriatic arthritis.
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