Stress analysis between “X”-shaped spine dynamic fixation and traditional pedicle screw fixation

doi:10.3969/j.issn.2095-4344.2015.53.015

Abstract

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 generally recognized clinically.

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.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

CLC Number:

R318

Wang Yu, Mei Ji-wen, Mu Shang-qiang, Gao Feng, Huang Rui. Stress analysis between “X”-shaped spine dynamic fixation and traditional pedicle screw fixation [J]. Chinese Journal of Tissue Engineering Research, 2015, 19(53): 8615-8620.

Figures/Tables 1

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