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Spondylitis Association of America

Ankylosing spondylitis
Synonyms Bekhterev's disease, Bechterew's disease, morbus Bechterew, Bekhterev-Strümpell-Marie disease, Marie's disease, Marie–Strümpell arthritis, Pierre–Marie's disease
0510 Spondylitis ankylosans (morbus bechterew) anagoria.JPG
A 6th-century skeleton showing fused vertebrae, a sign of severe ankylosing spondylitis.
Specialty Rheumatology
Symptoms Back pain, joint stiffness
Usual onset Young adulthood
Duration Long term
Causes Unknown
Diagnostic method Symptom based, medical imaging, blood tests
Treatment Medication, exercise, and surgery
Medication NSAIDs, steroids, DMARDs
Frequency 0.1 to 1.8%
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Classification
External resources

Ankylosing spondylitis (AS) is a type of arthritis in which there is long term inflammation of the joints of the spine. Typically the joints where the spine joins the pelvis are also affected. Occasionally other joints such as the shoulders or hips are involved. Eye and bowel problems may also occur. Back pain is a characteristic symptom of AS, and it often comes and goes. Stiffness of the affected joints generally worsens over time.

Although the cause of ankylosing spondylitis is unknown, it is believed to involve a combination of genetic and environmental factors. More than 90% of those affected have a specific human leukocyte antigen known as the HLA-B27 antigen. The underlying mechanism is believed to be autoimmune or autoinflammatory. Diagnosis is typically based on the symptoms with support from medical imaging and blood tests. AS is a type of seronegative spondyloarthropathy, meaning that tests show no presence of rheumatoid factor (RF) antibodies. It is also within a broader category known as axial spondyloarthritis.

There is no cure for ankylosing spondylitis. Treatments may improve symptoms and prevent worsening. This may include medication, exercise, and surgery. Medications used include NSAIDs, steroids, DMARDs such as sulfasalazine, and biologic agents such as infliximab.


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