中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (8): 1222-1227.doi: 10.3969/j.issn.2095-4344.1083

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

L4-5椎体有限元模型建立及退变椎间盘力学分析

文 毅1,苏 峰2,刘 肃2,宗治国2,张 鑫2,马朋朋2,李月轩1,李 瑞1,张志敏3   

  1. 1河北北方学院研究生学院,河北省张家口市 075000;河北北方学院附属第一医院,2脊柱外科,3放射科,河北省张家口市 075000
  • 出版日期:2019-03-18 发布日期:2019-03-18
  • 通讯作者: 苏峰,硕士,主任医师,河北北方学院附属第一医院脊柱外科,河北省张家口市 075000
  • 作者简介:文毅,男,1984年生,四川省邻水县人,汉族,河北北方学院在读硕士,主治医师,主要从事脊柱生物力学方面的研究。
  • 基金资助:

    河北省省级重大医学科研课题(zd2013050),项目负责人:苏峰

Establishment of finite element model of L4-5 and mechanical analysis of degenerative intervertebral discs  
 

Wen Yi1, Su Feng2, Liu Su2, Zong Zhiguo2, Zhang Xin2, Ma Pengpeng2, Li Yuexuan1, Li Rui1, Zhang Zhimin3   

  1. 1Graduate School, Hebei North University, Zhangjiakou 075000, Hebei Province, China; 2Department of Spinal Surgery, 3Department of Radiology, the First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, Hebei Province, China
  • Online:2019-03-18 Published:2019-03-18
  • Contact: Su Feng, Master, Chief physician, Department of Spinal Surgery, the First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, Hebei Province, China
  • About author:Wen Yi, Master candidate, Attending physician, Graduate School, Hebei North University, Zhangjiakou 075000, Hebei Province, China
  • Supported by:

    the Major Medical Scientific Research Subject of Hebei Province, No. zd2013050 (to SF)

摘要:

文章快速阅读:

 
 

 

文题释义:
腰椎有限元模型:该模型的建立是通过获取人体腰椎CT或MRI DICOM数据,运用mimics等三维重建软件对椎体进行三维重建,其中的3-matic部分可进行椎间盘等软组织的重建,将重建好的模型进行有限单元网格化,赋予材料属性后便可进行相关力学运算。
椎间盘退行性变:随着年龄的增长,椎间盘内髓核和纤维环水分含量逐渐降低,其内结构亦相应发生变化,结构的改变必然导致外部应力作用于椎间盘时其内部传导方向的改变,内外因素的相互作用加速其退变,退变椎间盘在缓冲、转移、分散脊柱载荷的能力方面逐渐降低。
 
摘要
背景:脊柱在人体中起着承上启下的作用,把躯干上部的重力传递到腰骶部直至骨盆,L4-5椎体处于脊柱的最下端,承受的载荷最大,其间的椎间盘亦承受相当的高应力,因此该部位椎间盘退变和突出高发。
目的:建立人L4-5椎体及椎间盘有限元模型,进行退变椎间盘力学仿真分析。
方法:利用GE64排螺旋CT对中年女性腰椎进行扫描,得到206层层厚为2 mm的CT断层DICOM图像,应用Mimics软件进行椎体的三维重建,再导入3-matic软件中建立椎间盘,划分面网格及体网格,再以CDB格式导入Mimics软件中赋予椎体及椎间盘材料属性,最后导入Ansys软件中建立韧带,进行L4-5椎体及椎间盘的生物力学分析。
结果与结论:①成功建立了可用于腰椎体及退变椎间盘力学分析的有限元模型;②站立情况下椎间盘前部承受的载荷较后部高(F=7.995,P < 0.000 1),处于椎间盘中部的髓核承受载荷较前部纤维环低(t=5.013,P < 0.000 1);③提示L4-5椎体有限元模型从生物力学角度证实,髓核及后部椎间盘突出与前部纤维环承受高应力后向髓核及后部纤维环传递,前部纤维环对髓核和后部纤维环的挤压与椎间盘的退行性变密切相关。

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
ORCID: 0000-0003-0678-2560(文毅)

关键词: 腰椎, 椎间盘, 椎体有限元模型, 退变椎间盘, 腰椎力学分析, 纤维环水分, 椎间盘受力载荷

Abstract:

BACKGROUND: Spine plays a connecting link role in the human body. The gravity of the upper part of the trunk is transmitted to the lumbosacral region until the pelvis. L4-5 vertebral body is at the lowermost end of the spine, and the load is the largest. The intervertebral disc is also subjected to considerable high stress, so the intervertebral disc is prone to degeneration and herniation.

OBJECTIVE: To establish a finite element model of human L4-5 vertebral body and intervertebral disc, and to conduct mechanical simulation analysis of degenerative disc.
METHODS: The lumbar spine of adult women was scanned by GE64 spiral CT, and 206 CT DICOM images of 2 mm in thickness were obtained. Three-dimensional reconstruction of the vertebral body was performed with Mimics software. Then 3-matic software was used to establish the intervertebral disc, to divide surface mesh and volume mesh, and then models were imported the Mimics software in CDB format to give vertebral body and intervertebral disc material properties, and finally imported inte Ansys software to establish ligaments for biomechanical analysis of L4-5 vertebrae and intervertebral disc.
RESULTS AND CONCLUSION: (1) The finite element model for the mechanical analysis of the lumbar vertebral body and the degenerated intervertebral disc was successfully established. (2) The standing force of the anterior disc was higher than that of the posterior part (F=7.995, P < 0.000 1). The nucleus in the middle of the intervertebral disc was subjected to the load compared with the anterior annulus. The anterior annulus was low (t=5.013, P < 0.000 1). (3) In summary, in the finite element model of the L4-5 vertebral body, the nucleus pulposus and the posterior disc herniation and the anterior annulus fibrosus are subjected to high stress and the posterior nucleus pulposus and posterior annulus fibrosus are transmitted from the biomechanical point of view. The compression of the nucleus and posterior annulus is closely related to the degeneration of the 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: Lumbar Vertebrae, Intervertebral Disk, Biomechanics, Tissue Engineering

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