中国组织工程研究 ›› 2024, Vol. 28 ›› Issue (22): 3548-3554.doi: 10.12307/2024.527

• 材料力学及表面改性 material mechanics and surface modification • 上一篇    下一篇

椎间隙注入不同弹性模量骨水泥对邻近上下椎体应力的影响

汪建新1,霍文涛1,于  泽2   

  1. 1内蒙古科技大学,内蒙古自治区包头市  014010;2内蒙古科技大学包头医学院第一附属医院,内蒙古自治区包头市  014017
  • 收稿日期:2023-09-12 接受日期:2023-10-30 出版日期:2024-08-08 发布日期:2024-01-20
  • 通讯作者: 霍文涛,在读硕士,内蒙古科技大学,内蒙古自治区包头市 014010
  • 作者简介:汪建新,男,1962年生,内蒙古自治区包头市人,汉族,博士,博士生导师,教授,主要从事生物力学方面的研究。
  • 基金资助:
    内蒙古自治区自然科学基金项目(NJZY22091),项目负责人:于泽

Effect of bone cement with different elastic moduli injected into intervertebral space on stress of adjacent upper and lower vertebrae

Wang Jianxin1, Huo Wentao1, Yu Ze2   

  1. 1Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia Autonomous Region, China; 2First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou 014017, Inner Mongolia Autonomous Region, China
  • Received:2023-09-12 Accepted:2023-10-30 Online:2024-08-08 Published:2024-01-20
  • Contact: Huo Wentao, Master candidate, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia Autonomous Region, China
  • About author:Wang Jianxin, MD, Doctoral supervisor, Professor, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia Autonomous Region, China
  • Supported by:
    Natural Science Foundation of Inner Mongolia Autonomous Region, No. NJZY22091 (to YZ)

摘要:


文题释义:

椎间隙:上下两个相邻椎体之间的间隙。
弹性模量:是指材料在弹性变形阶段的轴向应力与轴向应变之比。弹性模量可视为衡量材料产生弹性变形难易程度的指标,其值越大,使材料发生一定弹性变形的应力也越大,即材料刚度越大,在一定应力作用下发生弹性变形越小。


背景:近年来,针对腰椎间盘退变和椎间隙变窄所引起的腰部反复疼痛病症从国外引入了椎间隙注入骨水泥的治疗方法,但部分患者在治疗后出现椎体骨折的情况,原因可能是骨水泥弹性模量不佳。

目的:通过腰椎三维有限元模型分析椎间隙中注入不同弹性模量骨水泥对上下椎体表面最大应力的影响。
方法:招募1名脊柱正常志愿者获取CT数据,利用Mimics、Geomagic、SolidWorks、Ansys建立腰椎L2-L5有限元模型,随后建立L3-L4椎间隙注射不同剂量(1 mL与4 mL)骨水泥模型,每种剂量下赋予骨水泥4种弹性模量(1 000,2 000,4 000,8 000 MPa),在L2椎体表面施加压力与弯矩,分析L3椎体下表面与L4椎体上表面的应力。

结果与结论:①在骨水泥注入量相同的情况下,随着骨水泥弹性模量的增大,L3椎体下表面与L4椎体上表面的应力增加,其中弹性模量1 000 MPa骨水泥对L3椎体下表面与L4椎体上表面的应力影响最小,弹性模量8 000 MPa骨水泥对L3椎体下表面与L4椎体上表面的应力影响最大,不同弹性模量骨水泥对整个腰椎活动度的影响较小;②结果说明,在满足治疗要求的情况下注入较低弹性模量的骨水泥可以降低术后骨折风险。

https://orcid.org/0009-0003-4343-4589(汪建新)

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料口腔生物材料纳米材料缓释材料材料相容性组织工程

关键词: 经皮骨水泥椎间盘成形术, 腰椎, 骨水泥, 有限元, 应力, 弹性模量

Abstract: BACKGROUND: In recent years, the treatment method of injecting bone cement into the intervertebral space has been introduced from abroad for the treatment of lumbar recurrent pain caused by lumbar disc degeneration and intervertebral space narrowing; however, some patients had vertebral fractures after treatment; the fracture may occur because the bone cement injected into the intervertebral space has a poor elastic modulus.
OBJECTIVE: To analyze the effect of bone cement with different elastic moduli injected into the intervertebral space on the maximum stress of upper and lower vertebrae using a three-dimensional finite element model. 
METHODS: A volunteer with normal spine was recruited to obtain CT data. The finite element model of L2-L5 lumbar spine was established using Mimics, Geomagic, SolidWorks, and Ansys. Subsequently, a L3-L4 intervertebral space injection model with different doses (1 mL and 4 mL) of bone cement was established. Four different elastic moduli (1 000, 2 000, 4 000, and 8 000 MPa) were assigned to bone cement at each dose. Pressure and bending moment were applied on the surface of the L2 vertebral body to analyze the stress on the lower surface of the L3 vertebral body and the upper surface of the L4 vertebral body. 
RESULTS AND CONCLUSION: (1) In the case of the same amount of bone cement injection, as the elastic modulus of bone cement increased, the stress on the lower surface of L3 vertebral body and the upper surface of L4 vertebral body increased. Among them, the bone cement with an elastic modulus of 1 000 MPa had the least effect on the lower surface of L3 vertebral body and the upper surface of L4 vertebral body. Bone cement with elastic modulus of 8 000 MPa had the greatest effect on the lower surface of L3 vertebral body and the upper surface of L4 vertebral body. Bone cement with different elastic moduli had little effect on the motion range of the whole lumbar spine. (2) The results indicate that injecting bone cement with lower elastic modulus while meeting treatment requirements can reduce the risk of postoperative fractures. 

Key words: percutaneous cement discoplasty, lumbar vertebra, bone cement, finite element, stress, elastic modulus

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