中国组织工程研究 ›› 2023, Vol. 27 ›› Issue (34): 5436-5440.doi: 10.12307/2023.778

• 生物材料临床实践 clinical practice of biomaterials • 上一篇    下一篇

定量CT有限元分析椎体强化对不同位置非强化椎生物力学参数的影响

刘  进1,夏  宾1,蔡  鹏1,顾祖超2,杨浩森1,唐  静3   

  1. 1成都市第七人民医院骨科,四川省成都市   610041;2成都市第一人民医院骨科,四川省成都市   610041;3四川大学华西医院放射科,四川省成都市   610041
  • 收稿日期:2022-10-14 接受日期:2022-12-09 出版日期:2023-12-08 发布日期:2023-04-20
  • 通讯作者: 唐静,博士,副主任医师,四川大学华西医院放射科,四川省成都市 610041
  • 作者简介:刘进,男,1985年生,四川省都江堰市人,汉族,2021年四川大学毕业,博士,副主任医师,主要从事脊柱外科、骨质疏松的诊断与治疗相关研究。
  • 基金资助:
    四川省卫生健康委员会科研项目(20PJ194),项目负责人:刘进;成都市卫生健康委员会科研项目(2020133),项目负责人:刘进;成都医学院-成都市第七人民医院联合科研课题(2021LHJYPJ-04),项目负责人:刘进

Effect of vertebral augmentation using quantitative computed tomography-based finite element analysis on biomechanical parameters of non-enhanced vertebrae in different locations

Liu Jin1, Xia Bin1, Cai Peng1, Gu Zuchao2, Yang Haosen1, Tang Jing3   

  1. 1Department of Orthopedics, Chengdu Seventh People’s Hospital, Chengdu 610041, Sichuan Province, China; 2Department of Orthopedics, Chengdu First People’s Hospital, Chengdu 610041, Sichuan Province, China; 3Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
  • Received:2022-10-14 Accepted:2022-12-09 Online:2023-12-08 Published:2023-04-20
  • Contact: Tang Jing, MD, Associate chief physician, Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
  • About author:Liu Jin, MD, Associate chief physician, Department of Orthopedics, Chengdu Seventh People’s Hospital, Chengdu 610041, Sichuan Province, China
  • Supported by:
    Scientific Research Project of Sichuan Provincial Health Commission, No. 20PJ194 (to LJ); Scientific Research Project of Chengdu Municipal Health Commission, No. 2020133 (to LJ); Chengdu Medical College-Chengdu Seventh People’s Hospital Joint Research Project, No. 2021LHJYPJ-04 (to LJ)

摘要:


文题释义:

QCT:定量CT(quantitative computed tomography)是一种测量骨组织体积骨密度的CT扫描技术,测量结果单位为g/cm3。该技术能够根据骨组织的三维空间分布分别测量松质骨和皮质骨的骨矿物质含量,不受周围组织的影响,准确度较双能X射线骨密度仪测量的面积骨密度高。
QCT/FEA:即基于定量CT的有限元分析技术。该技术以QCT扫描数据为基础,能够建立骨微观三维结构,并将骨形态、骨密度分布的不同同时整合,以此进行虚拟力学研究,还可用于研究骨强度、骨折风险预测等;缺点在于辐射剂量较大,尚缺乏标准的有限元建模流程。

背景:骨水泥与骨质疏松椎体间在生物力学特性上的巨大差异是否会增加再骨折的发生还存有争议。骨水泥的置入将导致多大范围的非强化椎生物力学参数改变仍然不清楚。
目的:通过以定量CT为基础的长节段骨质疏松性椎体压缩骨折有限元模型,分析椎体强化对于骨质疏松脊柱生物力学参数的影响范围。
方法:以定量CT数据为基础构建T4-L5长节段T12椎体骨质疏松性压缩骨折模型,在对模型施加150 N垂直载荷的基础上,沿不同方向分别施加1.5 N•m的扭力矩以模拟前屈、后伸、左右侧屈及左右旋转状态,比较骨水泥置入前后模型椎体、椎间盘及小关节的应力变化。

结果与结论:①模型骨水泥置入后,各个运动状态下整体位移幅度平均下降约16%;②强化椎近端5个椎体应力较术前平均增加约20%,头端第一椎间盘应力较术前下降约20%,第二、第三椎间盘应力则分别增加约4%及2%;强化椎及其尾端邻椎小关节应力较术前下降约6%,其余尾端小关节及头端相邻4个节段小关节应力均较术前不同程度增加;并且这种应力改变均表现为距强化椎越近变化越显著的趋势;③结果表明椎体强化将导致强化椎头尾端多个椎体、椎间盘及小关节应力的显著改变,且距强化椎越近改变越明显,这种应力改变可能与椎体强化后再骨折的发生有关。

https://orcid.org/0000-0002-5623-6106 (刘进) 

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: 骨质疏松, 骨质疏松性椎体压缩骨折, 椎体成形术, 定量CT, 有限元分析

Abstract: BACKGROUND: Whether the huge difference in biomechanical properties between bone cement and osteoporotic vertebral body will increase the occurrence of refracture is still controversial. The extent to which cement implantation will affect the biomechanical parameters of unaugmented vertebrae remains unclear.  
OBJECTIVE: To analyze the influence range of vertebral augmentation on biomechanical parameters of the osteoporotic spine through the finite element model of long-segment osteoporotic vertebral compression fracture based on quantitative CT.
METHODS: The osteoporotic compression fracture model of T12 vertebrae with a long segment of T4-L5 was constructed based on quantitative CT data. On the basis of 150 N vertical load, 1.5 N•m torsional torque was applied to the model in different directions to simulate flexion, extension, lateral flexion and rotation. The stress changes of the vertebral bodies, intervertebral disc and facet joint were compared before and after bone cement implantation.  
RESULTS AND CONCLUSION: (1) After implantation of model bone cement, the overall displacement amplitude of each movement state decreased by 16% on average. (2) The stress of the fifth vertebrae away from the treated vertebra at the cephalic side increased by approximately 20% on average; the stress of the first intervertebral disc at the cephalic side decreased by approximately 20%, and the stress of the second and third intervertebral discs increased by approximately 4% and 2%, respectively. The stress of the facet joints of the treated vertebrae and its caudal adjacent vertebrae decreased by approximately 6%, and the stress of the other caudal facet joints and the four cephalic adjacent facet joints increased to different degrees. In addition, the stress changes tended to be more significant the closer to the treated vertebra. (3) The results of this study show that the stress of multiple vertebral body, intervertebral discs and facets at the cephalic and caudal sides from the augmented vertebra will be significantly changed by cement implantation, and the closer to the treated vertebra, the more obvious the effect is. This stress change may be associated with the occurrence of new fractures after vertebral augmentation.

Key words: osteoporosis, osteoporotic vertebral compression fracture, vertebroplasty, quantitative CT, finite element analysis

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