title: Surgical outcomes and complications after occipito-cervical fusion using the screw-rod system in craniocervical instability.
abstract: OBJECTIVE
  Although there is no consensus on the ideal treatment of the craniocervical instability, biomechanical stabilization and bone fusion can be induced through occipito-cervical fusion (OCF). The authors conducted this study to evaluate efficacy of OCF, as well as to explore methods in reducing complications.
  
  
  METHODS
  A total of 16 cases with craniocervical instability underwent OCF since the year 2002. The mean age of the patients was 51.5 years with a mean follow-up period of 34.9 months. The subjects were compared using lateral X-ray taken before the operation, after the operation, and during last follow-up. The Nurick score was used to assess neurological function pre and postoperatively.
  
  
  RESULTS
  All patients showed improvements in myelopathic symptoms after the operation. The mean preoperative Nurick score was 3.1. At the end of follow-up after surgery, the mean Nurick score was 2.0. After surgery, most patients' posterior occipito-cervical angle entered the normal range as the pre operation angle decresed from 121 to 114 degree. There were three cases with complications, such as, vertebral artery injury, occipital screw failure and wound infection. In two cases with cerebral palsy, occipital screw failures occurred. But, reoperation was performed in one case.
  
  
  CONCLUSIONS
  OCF is an effective method in treating craniocervical instability. However, the complication rate can be quite high when performing OCF in patients with cerebral palsy, rheumatoid arthritis. Much precaution should be taken when performing this procedure on high risk patients.
authors.affiliation: Department of Neurosurgery, Gachon University, Gil Hospital, Incheon, Korea.
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Choi
authors.forename: Sang Gu
authors.initials: SG
authors.lastname: Lee
authors.forename: Chan Woo
authors.initials: CW
authors.lastname: Park
authors.forename: Woo Kyung
authors.initials: WK
authors.lastname: Kim
authors.forename: Chan Jong
authors.initials: CJ
authors.lastname: Yoo
authors.forename: Seong
authors.initials: S
authors.lastname: Son
keywords: Atlanto-occipital joint; Cerebral palsy; Postoperative complications; Rheumatoid arthritis