Seronegative Spondyloarthropathies
Morning Rounds · Seronegative Spondyloarthropathies HLA-B27 MHC Class I Ankylosing Spondylitis 90% positive Reactive Arthritis 60–80% positive Psoriatic Arthritis axial: 50–70% IBD-SpA 25–75% (axial) Acute Ant. Uveitis 50% of cases B27+ nr-axSpA (no X-ray sacroiliitis)…