title: Ankylosing spondylitis with unusual spinal deformity: a case report.
abstract: A 26-yr-old male with ankylosing spondylitis with a fixed lumbar kyphosis is described. The presumed cause of this deformity was the assumption of a posture of spinal flexion from prolonged bicycle riding during a period of active inflammation in the lumbar apophyseal joints.
mesh_terms: D000328:Adult; D006801:Humans; D007738:Kyphosis / Q000209:etiology*; D008297:Male; D013167:Spondylitis, Ankylosing / Q000150:complications*