Ankylosing spondylitis


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Causes

By Mayo Clinic staff

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Illustration showing ankylosing spondylitis Ankylosing spondylitis

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Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved. In particular, people who have a gene called HLA-B27 are at significantly increased risk of developing ankylosing spondylitis.

As ankylosing spondylitis worsens and the inflammation persists, new bone forms as part of the body's attempt to heal. This new bone gradually bridges the gap between vertebrae and eventually fuses sections of vertebrae together. Those parts of your spine become stiff and inflexible. Fusion can also stiffen your rib cage, restricting your lung capacity and function.

Risk factors Symptoms
References
  1. Braveman SE. Ankylosing spondylitis. In: Frontera WR, et al. Essentials of Physical Medicine and Rehabilitation: Musculoskeletal Disorders, Pain, and Rehabilitation. 2nd ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-1-4160-4007-1..50112-7&isbn=978-1-4160-4007-1&type=bookPage&sectionEid=4-u1.0-B978-1-4160-4007-1..50112-7--cesec5&uniqId=228570791-3. Accessed Nov. 30, 2010.
  2. Yu DT. Clinical manifestations of ankylosing spondylitis in adults. http://www.uptodate.com/home/index.html. Accessed Nov. 30, 2010.
  3. Mercier LT. Ankylosing spondylitis. In: Ferri FF. Ferri's Clinical Advisor 2011: Instant Diagnosis and Treatment. Philadelphia, Pa.: Mosby Elsevier; 2011. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-0-323-05610-6..00010-X--sc0225&isbn=978-0-323-05610-6&sid=1090462943&type=bookPage&sectionEid=4-u1.0-B978-0-323-05610-6..00010-X--sc0225&uniqId=228720493-4#4-u1.0-B978-0-323-05610-6..00010-X--sc0225. Accessed Nov. 30, 2010.
  4. Yu DT. Treatment and prognosis of ankylosing spondylitis in adults. http://www.uptodate.com/home/index.html. Accessed Nov. 30, 2010.
  5. Inman RD. Clinical subsets of the spondyloarthropathies: Ankylosing spondylitis. In: Goldman L, et al. Cecil Medicine. 23rd ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-1-4160-2805-5..50291-3--cesec29&isbn=978-1-4160-2805-5&sid=1090462943&type=bookPage&sectionEid=4-u1.0-B978-1-4160-2805-5..50291-3--cesec33&uniqId=228720493-4#4-u1.0-B978-1-4160-2805-5..50291-3--cesec33. Accessed Nov. 30, 2010.
  6. Van der Linden SM, et al. Ankylosing spondylitis. In: Firestein GS, et al. Kelley's Textbook of Rheumatology. 8th ed. Philadelphia, Pa.: Saunders Elsevier; 2009. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-1-4160-3285-4..10070-1&isbn=978-1-4160-3285-4&sid=1090462943&type=bookPage&sectionEid=4-u1.0-B978-1-4160-3285-4..10070-1&uniqId=228720493-4#4-u1.0-B978-1-4160-3285-4..10070-1. Accessed Nov. 30, 2010.
DS00483 Feb. 3, 2011

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