A geometrical model of L4-L5 lumbar segment was constructed using a three-dimensional graphics software. Four conditions of the degenerated discs, i.e. light degeneration, moderate degeneration, severe degeneration and complete excision degeneration, were simulated with loading situations using finite element method under the condition of appropriate computational accuracy. By applying a vertical load of 378.93 N on L4 vertebral plate, stress nephograms on joint isthmus under four different working conditions were obtained. The results showed that the contacted area of facet joint was influenced by the degree of intervertebral disc degeneration level, which influenced the mises stress on joint isthmus. It was proved that joint isthmus was the important pressure-proof structure of the back of lumbar vertebra, and the stress values and distribution were related to structural stiffness of the back of lumbar vertebra as well as the contact area of facet joint. The conclusion could be the theoretical reference for the analysis of spinal biomechanics and artificial disc replacement as well.
Citation：
HUYingchun, OUYalong, HUYizhi, YUBinghao. Effects of Intervertebral Disc Degeneration on Biomechanics Behavior Characteristics of L4-L5 Under the Vertical Load. Journal of Biomedical Engineering, 2015, 32(1): 55-58, 66. doi: 10.7507/1001-5515.20150010
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Copyright © the editorial department of Journal of Biomedical Engineering of West China Medical Publisher. All rights reserved
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- 1. 兰俊, 陈其昕, 翟晓军, 等.腰椎间盘退变时椎间隙形态与腰椎曲度变化及其临床意义[J].中国临床解剖学杂志, 2005, 23(2):157-159, 162.
- 2. LU Y M, HUTTON W C, GHARPURAY V M. Can variations in intervertebral disc height affect the mechanical function of the disc?[J]. Spine (Phila Pa 1976), 1996, 21(19): 2208-2216; discussion 2217.
- 3. 易强英, 刘康, 冯刚.椎间盘纤维环组织工程研究进展[J].生物医学工程学杂志, 2011, 28(3):627-631.
- 4. 唐小君.椎间盘退变对腰椎生物力学影响的有限元研究[D].杭州:浙江大学, 2007.
- 5. 余兵浩.基于CT图像的人体腰椎反求建模与有限元分析研究[D].广西:广西科技大学, 2013.
- 6. 刘耀升, 陈其昕, 廖胜辉, 等.腰椎L_4~L_5活动节段有限元模型的建立与验证[J].第二军医大学学报, 2006, 27(6):665-669.
- 7. KIM Y E, GOEL V K, WEINSTEIN J N, et al. Effect of disc degeneration at one level on the adjacent level in axial mode[J]. Spine (Phila Pa 1976), 1991, 16(3): 331-335.
- 8. KUMARESAN S, YOGANANDAN N, PINTAR F A, et al. Contribution of disc degeneration to osteophyte formation in the cervical spine: a biomechanical investigation[J]. J Orthop Res, 2001, 19(5): 977-984.
- 9. 雷经发, 陈爽, 袁中凡, 等.生物力学等效软质材料弹性模量静态测试方法的分析与探讨[J].生物医学工程学杂志, 2013, 30(2):316-319.
- 10. JAYSON M I. Compression stresses in the posterior elements and pathologic Consequences[J]. Spine (Phila Pa 1976), 1983, 8(3): 338-339.
- 11. 刘乐斌, 应大君, 陈卫军.脊柱生物力学测试研究进展[J].解剖与临床, 2005, 10(1):68-69, 72.
