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Overview

Ankylosing spondylitis (AS) is one of a group of chronic conditions called spondyloarthropathy or spondyloarthritis, which also includes reactive arthritis, psoriatic arthritis, and Reiter's syndrome. Ankylosing spondylitis is an inflammatory disease that primarily affects the axial skeleton—the spine and the sacroiliac joint. The sacroiliac joint is located between the sacrum (bone at the base of the spine) and the pelvis.


The term "ankylosing" refers to stiffness or immob...Read the full article