Stress analysis between“X”-shaped spine dynamic fixation and traditional pedicle screw fixation
10.3969/j.issn.2095-4344.2015.53.015
- VernacularTitle:“X”形弹性脊柱内固定与传统椎弓根内固定的应力分析
- Author:
Yu WANG
;
Jiwen MEI
;
Shangqiang MU
;
Feng GAO
;
Rui HUANG
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2015;(53):8615-8620
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:Many scholars have developed a variety of dynamic elastic spine fixator. After biomechanical research, animal experiments and clinical application found that no one elastic spine fixator was general y recognized clinical y. OBJECTIVE:To compare the stress difference between“X”-shaped spine dynamic fixation and traditional pedicle screw fixation. METHODS:Three-dimensional finite element models of“X”-shaped spine dynamic fixation and traditional pedicle screw fixation were established according to adult spine imaging data. Mechanical differences in vertical compression, flexion, extension, lateral bending and rotation were compared between the two groups. RESULTS AND CONCLUSION:The stress at vertical compression was lower than that at flexion, extension, lateral bending and rotation in both groups. The stress at“X”-shaped spine dynamic fixation mainly focused on“X”-shaped connecting rod, but the stress of traditional pedicle screw fixation mainly focused on conjunction of screw-rod. Moreover, the stress of the screw of“X”-shaped spine dynamic fixation was significantly less than that of traditional pedicle screw fixation (P<0.001). These results suggest that“X”-shaped spine dynamic fixation system can share stress of screws and reduce the postoperative stress concentration compared with traditional pedicle screw fixation.
