Single use of transarticular screws in atlantoaxial instability
- VernacularTitle:应用经关节螺钉固定在寰枢关节不稳中的生物力学研究与临床应用
- Author:
Jianwei RUAN
;
Jian CHEN
;
Shunwu FAN
- Publication Type:Journal Article
- Keywords:
Atlanto-axial joint;
Joint instability;
Spinal fusion;
Biomechanics
- From:
Chinese Journal of Orthopaedics
2008;28(9):759-763
- CountryChina
- Language:Chinese
-
Abstract:
Objective To research the biomechanical characteristics and clinical applicant of posterior transarticular screws (Magerl technique) with bene graft in atlantoaxial instability.Methods 30 fresh cadaver human cervical spine specimens were obtained and randomized subdivided into 5 groups:intact group,atlantoaxial destabilized group,atlantoaxial destabilized and fixed with pedicle screws group,fixed with Magerl screws group and fixed with Maged screws combined with Brooks way group.ROM(range of motion)and NZ(neutral zone)of extend,flex,right and left lateral bend,right and left rotation of each specimen in 5 groups were measured.Transarticular screws were placed in 23 patients with atlantoaxial instability from 2000 Feb.to 2005 Jan.,with 16 males and 7 females,age from 17 to 62 years.20 of them were traumatic dislocation and 3 were congenital instable.Results Biomechanical study indicated that stability of all 6 degrees were Magerl+Brooks＞Magerl screws＞Pedicle screws＞Intact＞Destabilized.23 patient were fixed with 46 Maged screws in total,none were suffered from vertebral artery injury and neurological deterioration.All patients were followed-up from 4 to 36 months.2 of them complained that difficult in rotation of head.Conclusion Single use of Magerl screw can provide enough biomechanical stable for adantoaxial instability,and is an effective,low-risky way combined with intra-spinal-process bone graft.
