Source of Support: None, Conflict of Interest: None
Eleven patients with ankylosing spondylitis had a vertebral osteotomy for the fixed-flexion deformity of the spine. The Smith-Peterson technique of lumbar osteotomy was used and slow, controlled, correction achieved without using internal or external fixation. There were no serious complications. All the patients but one had improved, could see ahead and had solid fusion at six months.