The form of rheumatoid arthritis affecting the spine. It occurs predominantly in young males and produces pain and stiffness as a result of inflammation of the sacroiliac, intervertebral, and costovertebral joints.
Etiology is unknown.
PubMed Medline search on Ankylosing Spondylitis Support Groups National Ankylosing Spondylitis Society NASS, PO Box 179, Mayfield, East Sussex, TN20 6ZL, England. Provides social and medical support and education about the disease. Funds research and helps to educate medical professionals and the general public. Also aims to influence governing bodies and the NHS in order that better facilities for treatment should be provided. Provides branch contacts supported by physiotherapists who are prepared to supervise regular exercise sessions.