Sequential treatment of concomitant odontoid fracture and lower cervical fracture-dislocation: A case report.

Introduction And Importance: To report the sequential treatment of a Type II odontoid fracture combined with a severe lower cervical (C6-7) fracture-dislocation featuring bilateral facet joint interlocking.

Case Presentation: A 58-year-old male who had suffered an injury in a car accident, He presented neck pain and extremity paralysis. His neurological function was classified as per the American Spinal Injury Association (ASIA) impairment scale as Grade A, indicating complete deficits below the C6 spinal cord level. A cervical CT scan and magnetic resonance image showed a type II odontoid fracture, C6 slipped anteriorly, C6-7 bilateral facet joint fracture and interlocking, slightly compression change of C7 upper endplate.

Clinical Discussion: Emergency closed reduction using cranial tong traction was success 6 h after the injury. A subsequent CT scan proved the successful reduction of bilateral facet joint dislocations and the odontoid fracture. After careful overall assessment, anterior cervical decompression and fusion (ACDF) was performed at C5-6 and C6-7 segments three days later，while odontoid fracture was treated conservatively. At the 4 months follow-up, a CT scan demonstrated solid bone fusion at C5-6, C6-7 segments, along with successful healing at the odontoid fracture site. However, spinal cord was necrosis at C5-7 segments, and the patient's neurological function had no improvement.

Conclusion: The initial closed reduction could restore the alignment and preliminary stability of cervical spine at sub-axial cervical fracture-dislocation segment as well as displaced odontoid fracture. This timely and effective closed reduction significantly diminished sequential surgical trauma and mitigated associated risks.