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Ankylosing spondylitis (AS) is a form of arthritis that primarily affects the spine. This chronic condition can lead to fusion of the vertebrae, resulting in a rigid spine. AS can also affect the sacroiliac joints, peripheral joints, and digits, and in severe cases, it can lead to disability. Some of the symptoms seen in AS include back pain, postural abnormalities, buttock pain, and pain in the peripheral joints such as the hips, knees, and ankles.
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