Finite element analysis of biomechanics of degenerative lumbar scoliosis under six kinds of motion conditions_West China Medical Journal

Authors：

ZHOU Shilian , HU Xingxin , YANG Xi ,  LIU Limin

Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;

Corresponding author：

LIU Limin, Email: 18980601394@163.com

Keywords：

Degenerative lumbar scoliosis; Full lumbar segment; Three-dimensional finite element analysis; Biomechanical analysis

DOI：

10.7507/1002-0179.201808033

Video：

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ObjectiveTo completely establish a three-dimensional (3D) simulation model of degenerative lumbar scoliosis (DLS) with the whole lumbar segments, then to analyze the biomechanical changes of the scoliosis segments by finite element analysis.MethodsA case of DLS patient was selected with L_1-5 segments of CT scanning data, which was imported into MIMICS 15, SolidWorks, Hyper-Mesh software to establish a 3D simulation model, and ANSYS 15 was used to analyze the model. At the same time, different material properties and boundary loading conditions were assigned to various structures to simulate the actual human body conditions.ResultsThe 3D model built a total of 856 154 units and 232 850 nodes, including the reconstruction of fine vertebral bodies, intervertebral disc tissue, structure of various ligaments and joint cartilages. Under the load and torque, the range of whole lumbar segments was decreased, in the stress distribution on the four discs: the L_2/3 intervertebral disc stress value (3.320 MPa) > L _4/5 intervertebral disc stress value (0.783 MPa) > L _3/4 intervertebral disc stress value (0.551 MPa) > L _1/2 intervertebral disc stress value (0.462 MPa). The stress distribution of the vertebral body showed that, L₅ vertebral stress (34.0 MPa) > L ₄ (33.6 MPa) >L ₃ (30.0 MPa) > L ₁ (23.3 MPa) > L ₂ (22.4 MPa).ConclusionThe range of motion of the six degrees of freedom of the lumbar spine in DLS is decreased, the local stress distribution of the lumbar spine is abnormal, and the abnormal stress changes of the apical vertebral body and the top intervertebral disc may be the biomechanical basis for the occurrence or progression of DLS.

Citation： ZHOU Shilian, HU Xingxin, YANG Xi, LIU Limin. Finite element analysis of biomechanics of degenerative lumbar scoliosis under six kinds of motion conditions. West China Medical Journal, 2018, 33(9): 1099-1105. doi: 10.7507/1002-0179.201808033 Copy

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2.	Silva FE, Lenke LG. Adult degenerative scoliosis: evaluation and management. Neurosurg Focus, 2010, 28(3): E1.
3.	Xu L, Sun X, Huang S, et al. Degenerative lumbar scoliosis in Chinese Han population: prevalence and relationship to age, gender, bone mineral density, and body mass index. Eur Spine J, 2013, 22(6): 1326-1331.
4.	钱宇锋, 薛峰, 盛晓文, 等. 退变性腰椎侧凸症的自然进展和影像学测量指标间相关性的研究. 颈腰痛杂志, 2013, 34(2): 98-101.
5.	闫广奎, 叶君健. 有限元分析法在腰椎生物力学研究中的应用. 中国组织工程研究, 2012, 16(22): 4117-4119.
6.	冯其金, 赵玲娟, 郑昆仑, 等. 有限元分析法在腰椎生物力学中的研究进展. 中国中西医结合外科杂志, 2018, 24(2): 255-258.
7.	赵迪. 成人退变性脊柱侧凸有限元模型的建立及后路三维矫形生物力学研究. 长沙: 中南大学, 2010.
8.	郑杰, 杨永宏, 楼肃亮, 等. 退变性脊柱侧弯的生物力学有限元分析. 中国组织工程研究, 2013, 17(30): 5490-5496.
9.	Kim HJ, Chun HJ, Kang KT, et al. A validated finite element analysis of nerve root stress in degenerative lumbar scoliosis. Med Biol Eng Comput, 2009, 47(6): 599-605.
10.	Wang X, Dumas GA. Evaluation of effects of selected factors on inter-vertebral fusion-a simulation study. Med Eng Phys, 2005, 27(3): 197-207.
11.	Chen CS, Cheng CK, Liu CL, et al. Stress analysis of the disc adjacent to interbody fusion in lumbar spine. Med Eng Phys, 2001, 23(7): 483-491.
12.	Lu YM, Hutton WC, Gharpuray VM. Do bending, twisting, and diurnal fluid changes in the disc affect the propensity to prolapse? A viscoelastic finite element model. Spine (Phila Pa 1976), 1996, 21(22): 2570-2579.
13.	Polikeit A, Ferguson SJ, Nolte LP, et al. Factors influencing stresses in the lumbar spine after the insertion of intervertebral cages: finite element analysis. Eur Spine J, 2003, 12(4): 413-420.
14.	钱忠来, 唐天驷. 腰椎椎间盘三维有限元分析. 苏州大学学报: 医学版, 2002, 22(1): 4-7.
15.	Belytschko T, Kulak RF, Schultz AB, et al. Finite element stress analysis of an intervertebral disc. J Biomech, 1974, 7(3): 277-285.
16.	Zhu R, Niu WX. The effect of muscle direction on the predictions of finite element model of human lumbar spine. Biomed Res Int, 2018, 2018(58): 1-6.
17.	McNally DS, Adams MA. Internal intervertebral disc mechanics as revealed by stress profilometry. Spine (Phila Pa 1976), 1991, 17(1): 66-73.
18.	Rmeir A, Fairbank JC, Deborah AJ, et al. High pressures and asymmetrical stresses in the scoliotic disc in the absence of muscle loading. Scoliosis, 2007, 2(4): 1-16.
19.	Daffner SD, Vaccaro AR. Adult degenerative lumbar scoliosis. Am J Orthop (Belle Mead NJ), 2003, 32(2): 77-82.

1. Ellwitz J, Gupta M. Adult degenerative scoliosis//Patel VV, Patel A, Harrop JS, et al. Spine Surgery Basics. Berlin, Heidelberg: Springer, 2014: 247-258.
2. Silva FE, Lenke LG. Adult degenerative scoliosis: evaluation and management. Neurosurg Focus, 2010, 28(3): E1.
3. Xu L, Sun X, Huang S, et al. Degenerative lumbar scoliosis in Chinese Han population: prevalence and relationship to age, gender, bone mineral density, and body mass index. Eur Spine J, 2013, 22(6): 1326-1331.
4. 钱宇锋, 薛峰, 盛晓文, 等. 退变性腰椎侧凸症的自然进展和影像学测量指标间相关性的研究. 颈腰痛杂志, 2013, 34(2): 98-101.
5. 闫广奎, 叶君健. 有限元分析法在腰椎生物力学研究中的应用. 中国组织工程研究, 2012, 16(22): 4117-4119.
6. 冯其金, 赵玲娟, 郑昆仑, 等. 有限元分析法在腰椎生物力学中的研究进展. 中国中西医结合外科杂志, 2018, 24(2): 255-258.
7. 赵迪. 成人退变性脊柱侧凸有限元模型的建立及后路三维矫形生物力学研究. 长沙: 中南大学, 2010.
8. 郑杰, 杨永宏, 楼肃亮, 等. 退变性脊柱侧弯的生物力学有限元分析. 中国组织工程研究, 2013, 17(30): 5490-5496.
9. Kim HJ, Chun HJ, Kang KT, et al. A validated finite element analysis of nerve root stress in degenerative lumbar scoliosis. Med Biol Eng Comput, 2009, 47(6): 599-605.
10. Wang X, Dumas GA. Evaluation of effects of selected factors on inter-vertebral fusion-a simulation study. Med Eng Phys, 2005, 27(3): 197-207.
11. Chen CS, Cheng CK, Liu CL, et al. Stress analysis of the disc adjacent to interbody fusion in lumbar spine. Med Eng Phys, 2001, 23(7): 483-491.
12. Lu YM, Hutton WC, Gharpuray VM. Do bending, twisting, and diurnal fluid changes in the disc affect the propensity to prolapse? A viscoelastic finite element model. Spine (Phila Pa 1976), 1996, 21(22): 2570-2579.
13. Polikeit A, Ferguson SJ, Nolte LP, et al. Factors influencing stresses in the lumbar spine after the insertion of intervertebral cages: finite element analysis. Eur Spine J, 2003, 12(4): 413-420.
14. 钱忠来, 唐天驷. 腰椎椎间盘三维有限元分析. 苏州大学学报: 医学版, 2002, 22(1): 4-7.
15. Belytschko T, Kulak RF, Schultz AB, et al. Finite element stress analysis of an intervertebral disc. J Biomech, 1974, 7(3): 277-285.
16. Zhu R, Niu WX. The effect of muscle direction on the predictions of finite element model of human lumbar spine. Biomed Res Int, 2018, 2018(58): 1-6.
17. McNally DS, Adams MA. Internal intervertebral disc mechanics as revealed by stress profilometry. Spine (Phila Pa 1976), 1991, 17(1): 66-73.
18. Rmeir A, Fairbank JC, Deborah AJ, et al. High pressures and asymmetrical stresses in the scoliotic disc in the absence of muscle loading. Scoliosis, 2007, 2(4): 1-16.
19. Daffner SD, Vaccaro AR. Adult degenerative lumbar scoliosis. Am J Orthop (Belle Mead NJ), 2003, 32(2): 77-82.

West China Medical Journal

Finite element analysis of biomechanics of degenerative lumbar scoliosis under six kinds of motion conditions

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