Gradual multiplanar cervical osteotomy to correct kyphotic ankylosing spondylitic deformities.

from ankylosing spondylitis have progressive fusion of the spinal apophyseal joints, discs and sacroiliac joints, resulting in a complete ankylosis of the axial skeleton. Cervical, thoracic or lumbar kyphotic deformities may also develop. Fixed cervical kyphosis produces severe functional restrictions as the loss of horizontal gaze prevents those afflicted from engaging in various social interactions, driving a car or even determining direction when walking. Cervicothoracic deformities have been corrected by osteotomies as described by Urist in 1958 and Simmons in 1972. The purpose of this paper is to present a significant technical modification to these techniques that permitted safe, accurate treatment in 2 patients with unusual clinical presentations.