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FE modeling and analysis of L4-L5 lumbar segment under physiological loadings

Issue title: Papers from the 3rd International Conference on Biomedical Engineering and Technology (iCBEB 2014), 25–28 September 2014, Beijing, China

Subtitle:

Guest editors: Edward J. Ciaccio

Article type: Research Article

Authors: Yu, Bin* | Zhang, Chen | Qin, Chunyu | Yuan, Huaijiang

Affiliations: School of Computer Science and Technology Xidian University, Xi'an, Shaanxi, China

Correspondence: [*] Corresponding author: Bin Yu, School of Computer Science and Technology Xidian University, Xi'an, Shaanxi, China. E-mail:[email protected]

Keywords: Lumbar spine, motion, stress/strain, physiological loadings

DOI: 10.3233/THC-150975

Journal: Technology and Health Care, vol. 23, no. s2, pp. S383-S396, 2015

Published: 2015
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Abstract

BACKGROUND: Because of the complexity and construction, the failure rate of lumbar surgery is still high. It is necessary to find a solution to help improve the accuracy and safety of surgery.

OBJECTIVE: Construction and stress analysis of lumbar spine.

METHODS: The generated FE model based on CT scan images was validated and used to investigate the motion, and stress/strain of the vertebrae under different physiological loadings. A degenerated model was also simulated by changing the materials properties (E and Poisson's Ratio) of the intervertebral disc nucleus and annulus fibers from 1.0 N/mm^2 to 3.0 N/mm^2, and 0.42 to 0.45, respectively.

RESULTS: When annulus fibrosis is degenerating or under ictal external loadings, the annulus fibrosis will be in a state of protrusion and there will potential for other pathological changes, such as herniation of the nucleus pulpous.

CONCLUSION: The effects of these changes in the corresponding motion and stress/strain of the spinal motion segments were investigated with some conclusions drawn in relation to the normal model for future application of medical diagnosis and surgical treatment.

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