title: [Clinical observation of mid-stage complications after cervical disc replacement].
abstract: OBJECTIVE
  To summarize the therapeutic experience of Bryan prosthetic cervical disc replacement at the 3rd years after operation and to analyze the clinical effect, incidence rate of heterotopic ossification, conditions of prosthetic fusion in order to investigate the countermeasures.
  
  
  METHODS
  From December 2005 to December 2008, 54 patients with cervical syndrome (34 males and 20 females, the age was from 39 to 69 years with an average of 50.5) were treated with single level Bryan prosthetic cervical disc replacement. The patients were followed for 24-36 months with an average of 30 months. The symptoms and nerve function were evaluated according to JOA and Odom's scoring. The anterior-posterior and lateral cervical X-ray films were also taken regularly every three months for the observation of heterotopic ossification and prosthetic fusion. Meanwhile, the X-ray films of the forward bending, extending, left and right lateriflection were taken before operation and at the 1st years after operation for the measurement of the stability and rang (ROM) of replaced levels.
  
  
  RESULTS
  The pain symptom and neurological function of all 54 patients were improved obviously. JOA score increased with an average of 76.1%, and ROM of replaced levels also improved obviously. The incidence rate of heterotopic ossification and prosthetic fusion went up year by year, 3.7% (2/54) for the first year, 16.7% (9/54) for the second year and 22.2% (12/54) for the nearly third year.
  
  
  CONCLUSIONS
  Bryan prosthetic cervical disc replacement has better mid-stage results than conventional methods. Modified surgical methods and early rehabilitation exercise may reduce the relatively high incidence rate of heterotopic ossification and prosthetic fusion.
authors.affiliation: Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo 315040, Zhejiang, China. lucian0301@163.com
authors.forename: Lei-Jie
authors.initials: LJ
authors.lastname: Zhou
authors.forename: Ji-Ye
authors.initials: JY
authors.lastname: Lu
authors.forename: Rong-Ming
authors.initials: RM
authors.lastname: Xu
authors.forename: Biao
authors.initials: B
authors.lastname: Liang
authors.forename: Shao-Hua
authors.initials: SH
authors.lastname: Sun
authors.forename: Liu-Jun
authors.initials: LJ
authors.lastname: Zhao
mesh_terms: D000328:Adult; D000368:Aged; D002574:Cervical Vertebrae / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007403:Intervertebral Disc / Q000601:surgery; D007405:Intervertebral Disc Displacement / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology*; D019736:Prostheses and Implants; D016896:Treatment Outcome