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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.
These are all various forms of arthritis that can affect all joints. Ankylosing spondylitis is an inflammatory arthritis that always affects the SI joints. It can lead to stiffness and severe pain in the SI joints, due to inflammation in the sacroiliac joints (sacroiliitis).As the disease process continues, the SI joints can fuse together and have no range of motion.hese are all various forms of arthritis that can affect all joints. Ankylosing spondylitis is an inflammatory arthritis that always affects the SI joints. It can lead to stiffness and severe pain in the SI joints, due to inflammation in the sacroiliac joints (sacroiliitis).