Fig. 2

Surgical procedure of osteotomy through the fracture gap in a female patient with ankylosing spondylitis. a Photograph shows the position of the patient on the operating table. The patient was flexed in a reverse V shape to accommodate the kyphotic spine and adapt simultaneously to the correction of kyphotic deformity during operation. b Photograph shows a hyperplastic osteophyte located at the oseteotomy site. c, d Intraoperative X-ray fluoroscope was used after inserting the pedicle screws and correcting the kyphotic deformity