title: [Clinical application of atlantoaxial pedicle screw internal fixation for treatment of atlantoaxial dislocation].
abstract: OBJECTIVE
  To investigate the clinical effect of atlantoaxial pedicle screw internal fixation for treatment of atlantoaxial dislocation.
  
  
  METHODS
  Sixteen patients with atlantoaxial dislocation were treated from Dec. 2005 to June 2007, included 10 males and 6 females, aged from 38 to 45 years old (means 40.5 years). Among them 12 patients combined with nerve injury, according to ASIA grade: there were 3 cases in grade B, 5 cases in grade C, 4 cases in grade D. All patients received preoperative CT, radiograph and skull traction. Intraoperative posterior approach general spine pedicle screw-rod orthopaedics fixation system used and iliac bone block were implanted in space of posterior atlantal arch and axial vertebral plate. The outcome and complications were observed in the near future.
  
  
  RESULTS
  There was no vascular or neural injury found. The patients were followed up for 12 to 24 months (means 18 months). All head pain, acid storm symptoms were improved after operation. According to the Odom's clinical efficacy evaluation standard, 12 cases were excellent, 4 were good. Eleven cases of 12 with nerve injury recovered significantly. By ASIA classification: 1 cases was in grade B, 2 cases were in grade C, 5 cases were in grade D, 4 cases were in grade E. No looseness or breakage of screw occurred. Bony fusion was achieved in all cases.
  
  
  CONCLUSIONS
  Posterior approach atlantoaxial pedicle screw internal fixation have the advantages of direct screw placement, short-segment fusion, intraoperative reduction, fixation reliable, high fusion rate, and it can restablish the upper cervical vertebrae stability and help to recover the spinal cord and nerve function.
authors.affiliation: Wendeng Orthopaedic Hospital, Wendeng 264400,Shandong, China.
authors.forename: Yong-Jun
authors.initials: YJ
authors.lastname: Yang
authors.forename: En-Zhong
authors.initials: EZ
authors.lastname: Zhang
authors.forename: Yuan-Chao
authors.initials: YC
authors.lastname: Tan
authors.forename: Ji-Ping
authors.initials: JP
authors.lastname: Zhou
authors.forename: Shu-Qiang
authors.initials: SQ
authors.lastname: Yao
authors.forename: Chuan-Jie
authors.initials: CJ
authors.lastname: Jiang
authors.forename: Pei-Yan
authors.initials: PY
authors.lastname: Cong
mesh_terms: D000328:Adult; D001268:Atlanto-Axial Joint / Q000000981:diagnostic imaging / Q000293:injuries* / Q000503:physiopathology / Q000601:surgery*; D001863:Bone Screws; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome