A biomechanical study of anterior screw fixation for type II odontoid fracture with anteroinferior-posterosuperior fracture line.
- Author:
Hong-wei FANG
1
;
Jian-jun LI
;
Zeng-hui WU
;
Jun OU-YANG
;
Shi-zhen ZHONG
;
Wen-lu LIN
;
Liang-jun JIANG
;
Jun-qiang ZHAO
;
Ji-hua YU
;
Xiang-yang WANG
Author Information
- Publication Type:Journal Article
- MeSH: Biomechanical Phenomena; Bone Screws; Cervical Vertebrae; injuries; Fracture Fixation, Internal; methods; Humans; Spinal Fractures; physiopathology; surgery
- From: China Journal of Orthopaedics and Traumatology 2008;21(4):279-281
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the biomechanical effect of anterior screw fixation on the type II fractured odontoid process.
METHODSTwenty fresh human C1-C2 vertebrae specimens were harvested and randomly divided into three groups. The angle of type II fracture line was 0 degree in group I (n=6), 17 degrees in group II (n=8) and 25 degrees in group III (n=6). The fractures were treated by anterior screw fixation. Insertion torque,maximal axial pullout force and stiffness of the bone-screw were tested.
RESULTSThere was no significant difference of screw insertion torque and the pull-out strength between each group. The displacement of the odontoid fragment had an association to the angle of the fracture line,the displacement of the small angle was significantly higher than that of the large one (P < 0.5). No significant difference of structure stiffness of the bone-screw was found between each group.
CONCLUSIONAnterior screw fixation is feasible for type II odontoid fracture with certain fracture line extends from anteroinferior to posterosuperior.
