Ankylosing spondylitis (AS) is an autoimmune condition that affects the spine, resulting in chronic inflammation of the spine and the joints connecting the spine to the pelvis. It is a type of arthritis that primarily affects the joints of the spine, but can also affect other joints of the body. The exact cause of ankylosing spondylitis is unknown.
The mechanism of action of ankylosing spondylitis involves the immune system attacking healthy-tissue in the body, in this case the spine and its connecting joints. The immune system produces antibodies that attack the cells in the joints, causing inflammation and pain. Over time, the inflammation can cause the bones in the spine to fuse, resulting in ankylosis or stiffness of the spine.
In addition to inflammation of the spine and its connecting joints, ankylosing spondylitis can cause a range of other symptoms. These include fatigue, low back pain, stiffness, limited range of motion, and difficulty breathing due to the fusion of the rib cage.
Treatment for ankylosing spondylitis generally involves medications to reduce inflammation and pain, physical therapy to help maintain range of motion and strength, and lifestyle modifications to reduce the strain on the spine. These treatments can help to reduce the symptoms of ankylosing spondylitis and slow the progression of the condition.