Comparison of stress distribution of adjacent segments after artificial cervical disc replacement versus anterior cervical discectomy and fusion: a finite element analysis

doi:10.3969/j.issn.2095-4344.2016.44.001

Abstract

Abstract:

BACKGROUND: Previous clinical follow-up study showed that disc degeneration of adjacent segment after anterior cervical discectomy and fusion was faster than that of artificial cervical disc replacement. Compared with the anterior cervical discectomy and fusion, artificial cervical disc replacement can maintain a good range of motion of replacement segment. Further investigation should be taken to compare the difference between stress and fusion after replacement.

OBJECTIVE: To compare the adjacent level discs loads between artificial cervical disc replacement and anterior cervical discectomy and fusion.

METHODS: A healthy 30-year-old male volunteer was scanned with CT at the artificial cervical intervertebral disc and anterior cervical plate. Three-dimensional images were reconstructed with Mimics 10.01 and Geomagic Studio.v11 software. Above three-dimensional data were input into the Abaqus6.9 finite element analysis software for meshing, assignment, and stress analysis. Finite element method was used to simulate the stress changes of the adjacent segments after artificial cervical disc replacement and anterior cervical discectomy and fusion.
RESULTS AND CONCLUSION: (1) Under the same preload, during anteflexion, posterior extension, and lateroflexion, the disc stress at adjacent segment was significantly larger after anterior cervical discectomy and fusion than normal disc. Compared with normal persons, no significant difference was detected in stress of adjacent segment at anteflexion, posterior extension, and lateroflexion after artificial cervical disc replacement. (2) Compared with artificial cervical disc replacement group, the stress of adjacent segment increased 10.3%-51.6% in the anterior cervical discectomy and fusion group. (3) Finite element analysis showed that the stress was larger in the anterior cervical discectomy and fusion group than in the artificial cervical disc replacement group. With prolonged follow-up, compared with the conventional anterior decompression and fusion, artificial cervical disc replacement can better play its protective effect on the adjacent intervertebral disc.

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

Key words: Cervical Vertebrae, Intervertebral Disk, Stress, Mechanical, Finite Element Analysis, Tissue Engineering

CLC Number:

R318

Liu Ya-pu, Hou Xiu-wei, Wu Guang-liang, Xia Hong. Comparison of stress distribution of adjacent segments after artificial cervical disc replacement versus anterior cervical discectomy and fusion: a finite element analysis[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(44): 6541-6548.

Figures/Tables 1

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