Fig. 5

Images obtained in Case 2. a The X-ray fluoroscopy after cage insertion showed that the position of the left L5 pedicle guide wire was not satisfactory. b The surgeon adjusted the direction of the screws under the guidance of navigation again, ignoring the change in anatomical structure after slippage reset and intervertebral space restoration. c Postoperative X-ray fluoroscopy showed that the position of the left L5 pedicle screw was inward and upward, and the patient suffered from left lower extremity pain and numbness. d After a revision surgery to replace the left L5 pedicle screw, his left lower extremity symptoms were significantly relieved