Posterior fusion applying internal fixation and bone inducing material to treat atlanto-axial unstableness / 中国矫形外科杂志

ABSTRACT

[Objective]To investigate effects of surgical treaments applying different fixation apparatus and bone inducing material on atlanto-axial unstableness.[Method]Twenty-four cases of Afianto-axial unstablmaess were treated by posterior internal fixatiun and bono grafting,19 cases were operatad with Apofix instrument system and 5 cases with AOSYS instrument system,bone grafting was used with artificial bone inducing material.The fusion rate,physical curve of cervical vertibrae and side-effect of implantation were observed and function were evaluated.[Result]The follow-up period was from 6 months to 36 months.The average was 18 months.Bony implanting side-effect was not found.Pre-operative symptoms of nervours systems disappeared in 18 cases,diminished in 5 cases,improved in 1 case after operation.Function evaluationexcellent 20 casas,good 2 cases,better 2 casas,excellent rate 92.4%.[Conclusion]Authors consider that odontoid fracture with atlantoaxial unstabilization can be treated by surgical operation of posterion fusion appling Apofix,AOSYS systems with osteoinduction active materials to obtain instant stabilization and permanent arthrodesis,which is an effective method to re-establish the stableness of upper cervicals.