Biomechanic study on reduction of thoracolumbar burstfracture with pedicle screw
- VernacularTitle:胸腰椎爆裂骨折经后路椎弓根螺钉复位的生物力学研究
- Author:
Xiaobin ZHANG
;
Xiaoqian DANG
;
Kunzheng WANG
- Publication Type:Journal Article
- Keywords:
spine;
burstfracture;
AF system;
biomechanics
- From:
Journal of Xi'an Jiaotong University(Medical Sciences)
1981;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To supply safe mechanic refererence for reduction of thoracolumbar burstfracture with pediclc screws and lay biomechanic foundation for developing a new type of digitizing pediclc screws. Methods The change of stress and its scope of pediclc screws during reduction of thoracolumbar burstfracture were tested to determine the relationship of the degree of reduction with stress and strain. Results A total of 15 burstfracture specimens were obtained successfully. Stress was small and changed mildly at the beginning of reduction stage. Stress presented transparent elevation tendency at the stage of body height of 75% of intact until at the stage of 90%. When the height of vertebral body restored from 90% to 95%, the curve of stress changed gently. The maximum stress of left screw was 98.4?10.3 and the right was 101.2?13.4. The stress of bilateral screws did not differ significantly. It was calculated that the left strain was (34.64?3.84)N and the right one was (35.544?3.61)N, the moment was (5.20?0.58)Nm of the left and (5.33?0.54)Nm of the right. There was not significant difference between the strain and the moment of bilateral screws. Conclusion The safe range of reduction force is between 4.5Nm and 6Nm. The burstfracture of vertebral body can be both reduced successfully and prevented from overpropping.
