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脊柱关节病(spondyloarthropathy,SpA),又称血清阴性脊柱关节病(seronegative spondyloarthropathy),以强直性脊柱炎为原型,还包括银屑病关节炎(psoriatic arthritis,PsA)、反应性关节炎(reactivearthritis,ReA)/瑞特综合征(Reitor’s Syndrome)、炎性肠病性关节炎(inflammatory bowel disease arthritis,IBDA)和未分化型脊柱关节病(undifferentiate