Joint and nail involvement in Turkish patients with psoriatic arthritis.

Psoriatic arthritis is an autoimmune, chronic, systemic inflammatory disorder characterized by the association of arthritis with psoriasis. In this paper, we explore the characteristics of joint and nail involvement in Turkish patients with psoriatic arthritis. Forty patients with psoriasis (M/F, 18/22) and 49 (M/F, 25/24) subjects with psoriatic arthritis were included in the study. Clinical characteristics of the patients were recorded. The distribution of the subjects with arthritis: (according to the clinical and radiological findings): polyarticular, 65%; oligoarticular, 23%; isolated axial involvement, 7.7%; arthritis mutilans, 3.8%; sacroiliitis, 19%. Nail involvement was significantly higher among patients with arthritis; i.e., 91 versus 32%; (P<0.05). There were no correlation between the skin involvement pattern and the arthritis type (P>0.05). Nevertheless, no relation was observed between the psoriasis duration and arthritis (P>0.05). Nail involvement is a frequent feature of the psoriatic arthritis which may be a useful finding for differential diagnosis of psoriatic arthritis from other inflammatory arthropathies.