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 Psoriatic Arthritis  Investigations
The Erythrocyte Sedimentation Rate (ESR) is elevated Serum Uric Acid may be elevated in a few patients. Anti Nuclear Antibodies (ANA) and Rheumatoid Factor (RA) are usually negative. X-Ray Findings: The DIP joints of fingers and the interphalangeal joints of the toes show erosions. Bony Ankylosis of the DIP joints of the hands and the toes, along with bony proliferations of the base of the distal phalanx, and Resorption of the tufts of the distal phalanges of the hands and feet are seen. Fluffy periostitis of the large, "pencil in cup" appearance of the DIP joints, absence of symmetry and gross destruction of isolated small joints is also seen. Radio graphically, spine changes and sacroilitis joint changes appear similar as in AnkylosingSpondylitis, but are often unilateral in Psoriatic Arthritis. Magnetic Resonance imaging (MRI) is more effective to detect enthesites and early articular and periarticular involvement. |
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