Psoriatic arthritis
（重定向自Psoriatic arthropathy）
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![Magnetic resonance images of the fingers in psoriatic arthritis. Shown are T1-weighted (a) pre-contrast and (b) post-contrast coronal images. Enhancement of the synovial membrane at the third and fourth proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints is seen, indicating active synovitis (inflammation of the synovial membrane; large arrows). There is joint space narrowing with bone proliferation at the third PIP joint and erosions are present at the fourth DIP joint (white circle). Extracapsular enhancement (small arrows) is seen medial to the third and fourth PIP joints, indicating probable enthesitis (inflammation of a tendon insertion).](/Images/godic/202502/05/Psoriatic_arthritis_fingers_ar1934-13230.gif")
![](/Images/godic/202502/05/Psoriatic_arthritis_spine_ar1934-63230.gif")
Psoriatic arthritis (also arthritis psoriatica, arthropathic psoriasis or psoriatic arthropathy) is a type of inflammatory arthritis that will develop in up to 30 percent of people who have the chronic skin condition psoriasis. Psoriatic arthritis is classified as a seronegative spondyloarthropathy and therefore occurs more commonly in patients with tissue type HLA-B27.