C. Clinical features 1. Onset is usually insidious. Patterns of joint involvement. Most joints may be involved. Sacroiliitis is usually asymmetric and spinal disease, discontinuous.
Psoriasis usually precedes arthritis.
Although psoriasis tends to more severe in patients with severe, deforming polyarthritis, skin and joint disease tends to correlate very little. Rarely aortic insufficiency, pulmonary fibrosis, amyloidosis. 5. No specific laboratory tests. V. Enteropathic arthritis A. Definition -spondyloarthropathy associated with a defined gastrointestinal disease. HLA-B27 is strongly associated with AS associated IBD but not isolated sacroiliitis or peripheral arthritis.