Fig. 2

This patient had a history of AS for more than 36 years, with severe kyphosis. He was admitted to the hospital due to low back pain, without any obvious trauma. There was no spinal cord injury before surgery. a-b Preoperative X-ray shows a severe kyphosis. c Preoperative CT shows obvious vertebral calcification and osteoporosis, the fracture position was L1/2. d Preoperative MRI shows significant signal changes between L1/2. e-f Postoperative X-ray shows satisfactory pedicle screw position and good resetting effect