中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (52): 8365-8372.doi: 10.3969/j.issn.2095-4344.2015.52.001

• 组织工程骨及软骨材料 tissue-engineered bone and cartilage materials •    下一篇

骨水泥注射体积与骨质疏松压缩性骨折椎体及邻近椎体应力的关系

包拥政1,祝周兴2,冯云升3,吴 强1,胡孔和1,何小龙1,朱文刚1,席新华1,钟学仁1,周龙泽1,廖军健1,戴相恒1   

  1. 1汕头大学医学院附属粤北人民医院骨科四区,广东省韶关市 512026;2韶关乐昌市人民医院骨科,广东省韶关市 512200;3韶关南雄市中医院骨科,广东省韶关市 512400
  • 收稿日期:2015-11-06 出版日期:2015-12-17 发布日期:2015-12-17
  • 通讯作者: 包拥政,在读博士,主治医师,汕头大学医学院附属粤北人民医院骨科四区,广东省韶关市 512026
  • 作者简介:包拥政,男,1985年生,广东省韶关市人,汉族,南方医科大学在读博士,主治医师,主要从事脊柱外科方面的研究。
  • 基金资助:

    2013年韶关市医药卫生科研计划项目(Y13175)

Relationship of bone cement injection volume with the stress of osteoporotic compression fractured and adjacent vertebrae

Bao Yong-zheng1, Zhu Zhou-xing2, Feng Yun-sheng3, Wu Qiang1, Hu Kong-he1, He Xiao-long1,
Zhu Wen-gang1, Xi Xin-hua1, Zhong Xue-ren1, Zhou Long-ze1, Liao Jun-jian1, Dai Xiang-heng1   

  1. 1Fourth Ward, Department of Orthopedics, Yue Bei People’s Hospital Affiliated to Shantou University Medical College, Shaoguan 512026, Guangdong Province, China; 2Department of Orthopedics, Lechang City People’s Hospital, Shaoguan 512200, Guangdong Province, China; 3Department of Orthopedics, Nanxiong Hospital of Traditional Chinese Medicine, Shaoguan 512400, Guangdong Province, China
  • Received:2015-11-06 Online:2015-12-17 Published:2015-12-17
  • Contact: Bao Yong-zheng, Fourth Ward , Department of Orthopedics, Yue Bei People’s Hospital Affiliated to Shantou University Medical College, Shaoguan 512026, Guangdong Province, China
  • About author:Bao Yong-zheng, Studying for doctorate, Attending physician, Fourth Ward, Department of Orthopedics, Yue Bei People’s Hospital Affiliated to Shantou University Medical College, Shaoguan 512026, Guangdong Province, China
  • Supported by:

    the Medical and Health Research Project of Shaoguan in 2013, No. Y13175

摘要:

背景:椎体成形及椎体后凸成形可有效修复骨质疏松性椎体压缩性骨折,但术后可引起骨折椎体及邻近椎体应力改变易导致新发骨折。
目的:应用三维有限元法分析椎体成形不同体积骨水泥注射后骨折椎体及邻近椎体的应力变化。
方法:选取1例有代表性的健康成年男性志愿者行腰椎CT扫描,将图像处理后导出应用Mimics进行三维重建,应用Geomagic对三维模型进行光滑、打磨、去噪,Ansys Workbench下装配实体模型,赋值后建立L2-L4段骨质疏松椎体压缩性骨折模型。设定在L3椎体注入分别1 mL、2 mL、4 mL、6 mL骨水泥,骨水泥在椎体中央呈球形分布。在L2上表面施加500 N预载荷,附加弯矩为50 N•m,约束L4下表面自由度。模拟L2-L4前屈、后伸、右屈及右侧轴向旋转4种运动状态,比较不同体积骨水泥注射前后骨折椎体及上下邻近椎体的应力变化。
结果与结论:骨折椎体及邻近椎体应力骨水泥注射后均较注射前明显增加,并随骨水泥注入量的增加骨折椎体及邻近椎体承受的应力也随之增大,其可能是导致邻近椎体骨折的因素之一。 

 

关键词: 生物材料, 骨生物材料, 骨质疏松, 椎体压缩性骨折, 椎体成形术, 骨水泥, 邻近椎体, 生物力学, 三维有限元分析

Abstract:

BACKGROUND: Vertebroplasty and kyphoplasty can effectively repair osteoporotic vertebral compression fractures, but postoperative change of stress in the fractured vertebrae and adjacent vertebrae can lead to new fractures.
OBJECTIVE: To analyze the stress changes of the fractured and adjacent vertebrae with different bone cement injection volume by three-dimensional finite element method.
METHODS: One healthy adult male volunteer was selected for lumbar spine CT scan. The acquired images were 
imported for three-dimensional reconstruction using Mimics. The three-dimensional model was smoothed, polished and denoised by Geomagic software, and then the solid mode was built under Workbench Ansys. The osteoporotic vertebral compression fracture model in L2-L4 segments was established after assignment. Bone cement of 1, 2, 4, 6 mL was injected into the L3 vertebrae respectively and distributed in the middle of the vertebrae as spherical shape. 500 N pre-load was applied on L2 surface with an additional moment of 50 N•m. The lower surface free degree of L4 was restrainted. The L2-L4 forward flexion, extension, right flexion and axial rotation on the right side were stimulated to compare the stress changes of fractured vertebrae and adjacent vertebrae before and after the bone cement injection with different volume.
RESULTS AND CONCLUSION: The stresses of fractured and adjacent vertebrae after the bone cement injection were significantly increased; meanwhile, the stresses of fractured and adjacent vertebrae increased with the increase of bone cement injection volume, which may be one of the factors leading to the compression fractures of adjacent vertebrae. 

 

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