title: Treatment of irreducible atlantoaxial dislocation using the transoral atlantoaxial pedicle screw technique. A report of 10 cases.
abstract: OBJECTIVE
  The purpose of this work is to evaluate the outcome of the transoral atlantoaxial pedicle screw technique for the treatment of irreducible atlantoaxial dislocation (IAAD).
  
  
  METHODS
  A total of 10 patients with IAAD were treated using the transoral atlantoaxial pedicle screw technique. We compared preoperative and postoperative JOA (Japanese Orthopedic Association) scores and observed bone graft fusion rate of the atlantoaxial joint, and examined whether our technique was suitable for the treatment of IAAD.
  
  
  RESULTS
  The mean preoperative and postoperative JOA scores (9.2 ± 0.63 and 12.9 ± 0.73, respectively) were significantly different (P < 0.05). The atlantoaxial rigid bony fusion rate was 100 % in 10 cases. All cases were followed up for an average of 5.1 years (range 3.5-6 years).
  
  
  CONCLUSIONS
  The transoral atlantoaxial screw reconstruction plate technique is a novel surgical technique for the treatment of IAAD in upper cervical diseases.
authors.affiliation: Department of orthopedics, Ningbo No. 2 Hospital, 41 Xi Bei Road, 315010, Ningbo, People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Department of Orthopedics, Guangzhou Liuhuaqiao Hospital, 111 Liu Hua Road, 510010, Guangzhou, People's Republic of China. 15967868807@163.com.
authors.forename: Zeng-Hui
authors.initials: ZH
authors.lastname: Wu
authors.affiliation: Ningbo Municipal Hospital of TCM, Ningbo, People's Republic of China.
authors.forename: Yi-Hong
authors.initials: YH
authors.lastname: Yin
authors.affiliation: Department of Orthopedics, Guangzhou Liuhuaqiao Hospital, 111 Liu Hua Road, 510010, Guangzhou, People's Republic of China.
authors.forename: Qing-Shui
authors.initials: QS
authors.lastname: Yin
authors.affiliation: Department of Orthopedics, Guangzhou Liuhuaqiao Hospital, 111 Liu Hua Road, 510010, Guangzhou, People's Republic of China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
mesh_terms: D000328:Adult; D001268:Atlanto-Axial Joint / Q000293:injuries* / Q000601:surgery*; D001860:Bone Plates; D006801:Humans; D004204:Joint Dislocations / Q000601:surgery*; D008875:Middle Aged; D065289:Pedicle Screws; D011474:Prosthesis Design; D013123:Spinal Fusion / Q000295:instrumentation* / Q000379:methods; D016896:Treatment Outcome
keywords: Bone grafting; Cervical spinal cord; Cervical vertebrae; Internal fixators; Spine