title: Epidemiology of spinal cord injury after acute odontoid fractures.
abstract: OBJECTIVE
  Cervical spinal cord injury (SCI) after odontoid fracture is unusual. To identify predisposing factors, the authors evaluated a consecutive series of patients who sustained SCI from odontoid fractures.
  
  
  METHODS
  A consecutive series of 5096 admissions to the Delaware Valley Regional Spinal Cord Injury Center were reviewed, and 126 patients with neurological impairment at the C1-3 levels were identified. Seventeen patients had acute closed odontoid fractures with neurological deficit. Various parameters including demographics, mechanisms of injury, associated injuries, fracture types/displacements, and radiographic cervical canal dimensions were compared between "complete" and "incomplete" spinal cord injured-patients as well as with neurologically intact patients who had suffered odontoid fractures. There were similar demographics, mechanisms of injury, associated injuries, fracture type/displacement, and canal dimensions in patients with complete and incomplete SCIs. However, only patients with complete injury were ventilator dependent. In comparison with patients with intact spinal cords, spinal cord-injured patients were more commonly males (p = 0.011) who had sustained higher velocity injuries (p = 0.027). The computerized tomography scans of 11 of 17 neurologically impaired patients were compared with those of a random sample of 11 patients with intact spinal cords. Although the anteroposterior diameter (p = 0.028) and cross-sectional area (p = 0.0004) of the cervical spinal canal at the C-2 level were smaller in impaired patients, the displacement of the fragment was not different.
  
  
  CONCLUSIONS
  Odontoid fractures are an infrequent cause of SCI. Patients with these injuries typically are males who have smaller spinal canals and have sustained high velocity injuries.
authors.affiliation: Department of Neurosurgery, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA. EJHarrop@aol.com
authors.forename: J S
authors.initials: JS
authors.lastname: Harrop
authors.forename: A D
authors.initials: AD
authors.lastname: Sharan
authors.forename: G J
authors.initials: GJ
authors.lastname: Przybylski
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002574:Cervical Vertebrae / Q000473:pathology; D003691:Delaware / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009422:Nervous System Diseases / Q000453:epidemiology / Q000209:etiology / Q000473:pathology; D009809:Odontoid Process / Q000293:injuries* / Q000503:physiopathology*; D012189:Retrospective Studies; D013119:Spinal Cord Injuries / Q000453:epidemiology* / Q000209:etiology*; D016103:Spinal Fractures / Q000150:complications*; D014057:Tomography, X-Ray Computed / Q000379:methods