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Ankylosing Spondylitis (AS) is a type of progressive arthritis that leads to chronic inflammation of the spine and sacroiliac joints. It can also affect other joints and organs in the body, such as the eyes, lungs, kidneys, shoulders, knees, hips, heart, and ankles.
Ankylosing spondylitis is often abbreviated to AS and is also known as seronegative spondyloarthropathy, and simply spondylitis. 2. The condition is grouped into a set of overlapping arthritis disorders that doctors call the spondyloarthritides or spondylarthritis.ere are some key points about ankylosing spondylitis. More detail and supporting information is in the body of this article. 1  Ankylosing spondylitis is a type of arthritis. 2  It mostly affects the lower part of the spine, and where it joins to the hip.