Fig. 5.

A, B A 60-year-old male sustained a comminution type C5 lateral mass fracture with spinal cord injury of Frankel C grade. The supposed injury mechanism was C5–C6 compressive-extension injury, according to Allen’s classification. C, D The comminuted right lateral mass displaced posteriorly, demonstrating two-level instability. E–G Two-level posterior fixation and fusion was carried out with cervical pedicle screw system, followed by C4–C7 laminoplasty. Successful arthrodesis was shown at 1 year postoperatively. The oblique X-ray demonstrated correct screw purchase