Fig. 4From: Staged cervical osteotomy:a new strategy for correcting ankylosing spondylitis thoracolumbar kyphotic deformity with fused cervical spineA wedge osteotomy was performed at the anterior and middle columns. Laminectomies were performed from C6 to T1. The planned osteotomy angle is 30°. The length of the anterior edge of osteotomy is 1.2 cmBack to article page