中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (22): 3263-3271.doi: 10.3969/j.issn.2095-4344.2016.22.010

• 数字化骨科 digital orthopedics • 上一篇    下一篇

T12椎体前缘不同压缩状态下相邻椎体终板应力的有限元分析

冯杰荣,殷海东,陈 伟,黄明光   

  1. 南方医科大学附属顺德第一人民医院,广东省佛山市 528300
  • 修回日期:2016-02-29 出版日期:2016-05-27 发布日期:2016-05-27
  • 通讯作者: 黄明光,主任医师,南方医科大学附属顺德第一人民医院,广东省佛山市 528300
  • 作者简介:冯杰荣,男,1979年生,广东省佛山市人,汉族,2003年解放军第一军医大学毕业,主治医师,主要从事骨病关节外科、运动医学方面的研究。
  • 基金资助:

    佛山市卫生与计生局医学科研课题(2015236)

Finite element analysis of stress of the adjacent vertebral end plate of T12 vertebral body in different compression states

Feng Jie-rong, Yin Hai-dong, Chen Wei, Huang Ming-guang   

  1. the First People’s Hospital of Shunde Affiliated to Southern Medical University, Foshan 528300, Guangdong Province, China
  • Revised:2016-02-29 Online:2016-05-27 Published:2016-05-27
  • Contact: Huang Ming-guang, Chief physician, the First People’s Hospital of Shunde Affiliated to Southern Medical University, Foshan 528300, Guangdong Province, China
  • About author:Feng Jie-rong, Attending physician, the First People’s Hospital of Shunde Affiliated to Southern Medical University, Foshan 528300, Guangdong Province, China
  • Supported by:

    the Foshan Municipal Health and Family Planning Bureau Project, No. 2015236

摘要:

文章快速阅读:

 
 
文题释义:
椎体终板:椎体在生长发育过程中,椎体上下面的骨骺板骨化停止后形成骨板,呈轻度凹陷,即为骨性终板。椎体终板的中央仍为一薄层透明软骨覆盖,并终生存在,即为软骨终板,上下软骨终板与髓核和纤维环连接共同构成椎间盘。
椎体压缩性骨折:是老年性骨质疏松常见的并发症,主要发生在胸腰段椎体,以T12椎体最为多见。椎体压缩性骨折由于椎体前缘的高度丢失,可导致局部后凸畸形、生理曲线发生改变,继而使骨折椎体前方应力集中及骨折椎体周围应力增大,从而导致邻近椎体再骨折的发生。
 
摘要
背景:椎体压缩骨折是老年骨质疏松症患者最常见的脊柱骨折,椎体前缘的压缩程度与邻近椎体再骨折是否相关尚未明确。
目的:利用有限元方法建立T12椎体前缘不同压缩状态模型,并分析T12椎体前缘压缩程度与邻椎终板应力的相关性。
方法:基于正常成年人志愿者的胸腰段CT数据,导入MIMICS/3-matic,经图像分割、修补及三维网格化获取胸腰椎T11-L1节段数据,网格赋材质属性后导入ABAQUS,建立韧带、小关节等特征,获取逼真的三维有限元模型。对模型前屈、后伸、左侧屈、右侧屈、左旋及右旋等6个自由度进行加载,验证正常模型的有效性。分别将T12椎体前缘压缩至90%,80%,70%……10%共9个状态,提取T11下终板及L1上终板的MISES应力,获得压缩状态与邻近终板应力的关系曲线。

结果与结论:①该模型高度逼真,能真实反映实际受力状态;②结果表明,T11椎体下位终板和L1椎体上位终板的应力值与T12椎体前缘的压缩程度呈正相关,应力增加可能导致终板骨折的可能性增加,进而增大相邻椎体的骨折风险。

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: 0000-0002-6266-2451(黄明光)

关键词: 骨科植入物, 脊柱植入物, 胸腰椎, 有限元分析, ABAQUS, 三维模型, 压缩状态, 终板应力

Abstract:

BACKGROUND: Vertebral compression fractures are the most common vertebral fractures in the elderly patients with osteoporosis, and the correlation between the compression of anterior border of vertebral body and adjacent vertebral refractures is not clear.

OBJECTIVE: To establish a model of different compression of T12 vertebral body with finite element method, and analyze the relationship between the compression of T12 vertebral body and the stress of adjacent vertebral plate.
METHODS: Based on thoracolumbar CT data of normal adult volunteers, MIMICS/3-matic was imported. Through image segmentation, repair and three-dimensional mesh of access to thoracic and lumbar T11-L1 data, grid assigned material properties was imported to ABAQUS so as to establish ligament, joint and other small features and obtain realistic three-dimensional finite element model. The six degrees of freedom, including anteflexion, posterior extension, left and right flexion, left and right rotation, were loaded, to verify the validity of the normal model. With the frontier of vertebral body compression to 90%, 80%, 70%…10% of the nine states, MISES stresses of the T11 and L1 segment intervertebral disc endplate were extracted; the relationship curve of compression state and endplate stress was obtained.

RESULTS AND CONCLUSION: (1) The model was highly realistic and could reflect the actual stress state. (2) The stress value of T11 vertebral body and L1 vertebral body was positively correlated with the compression of T12 vertebral body. Increased stress may lead to an increased likelihood of end plate fractures, which increases the risk of fractures in the adjacent vertebral bodies.
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: Thoracic Vertebrae, Lumbar Vertebrae, Stress, Mechanical, Finite Element Analysis, Tissue Engineering

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