中国组织工程研究 ›› 2014, Vol. 18 ›› Issue (35): 5640-5646.doi: 10.3969/j.issn.2095-4344.2014.35.012

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

下颈椎三节段全椎板切除与侧块螺钉内固定三维有限元模型的建立

宋明智1,董  超2,李  丹2,马  凯1   

  1. 1大连医科大学附属第一医院骨科,辽宁省大连市  116011
    2大连交通大学机械工程学院,辽宁省大连市  116028
  • 修回日期:2014-07-21 出版日期:2014-08-27 发布日期:2014-08-27
  • 通讯作者: 马凯,硕士,主任医师,教授,大连医科大学附属第一医院骨科,辽宁省大连市116011
  • 作者简介:宋明智,男,1987年生,辽宁大连市人,汉族,大连医科大学在读硕士,医师,主要从事脊柱疾病、数字化骨科及骨肿瘤研究。
  • 基金资助:

    大连市科技计划项目(2011E12SF037)

Construction of three-dimensional finite element model with lateral mass screw fixation following lower cervical three-segment laminectomy

Song Ming-zhi1, Dong Chao2, Li Dan2, Ma Kai1   

  1. 1Department of Orthopedics, First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
    2School of Mechanical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, China
  • Revised:2014-07-21 Online:2014-08-27 Published:2014-08-27
  • Contact: Ma Kai, Master, Chief physician, Professor, Department of Orthopedics, First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
  • About author:Song Ming-zhi, Studying for master’s degree, Physician, Department of Orthopedics, First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
  • Supported by:

    the Science and Technology Project of Dalian City, No. 2011E12SF037

摘要:

背景:随着颈椎后路手术技术的日益完善,侧块螺钉内固定技术已被广泛应用于颈椎的重建稳定性手术之中。然而,当前对于侧块螺钉内固定系统重建颈椎稳定性的有限元研究却很少。
目的:建立精细下颈椎(C3-C7)及三节段全椎板切除后应用侧块螺钉内固定重建的三维有限元模型,对重建后的下颈椎及内固定进行生物力学分析。
方法:采集1例30岁正常女性志愿者行全颈椎CT,得到Dicom数据集。应用Mimics 10.01、Geomagic Studio12.0、Solidworks2012、HyperMesh10.1、Abaqus 6.12软件建立下颈椎(C3-C7)完整模型、全椎板切除模型以及侧块螺钉内固定系统重建模型。分析重建模型在前屈、后伸、侧弯和旋转运动状态下的应力变化情况。
结果与结论:所建下颈椎有限元模型结构精细,外形逼真,共包含503 911个四面体单元,93 390个节点,并通过有效性验证。在软件中完成模拟手术过程,最终得到侧块螺钉内固定重建模型。侧块螺钉内固定系统对全椎板切除模型具有良好的稳定性,重建后颈椎的活动度远低于完整模型,且后伸时侧块螺钉内固定系统的应力最为集中。


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


全文链接:

关键词: 植入物, 脊柱植入物, 全椎板切除, 有限元法, 下颈椎, 计算机辅助设计, 侧块, 内固定, 生物力学, 应力分布

Abstract:

BACKGROUND: With the improvement of cervical posterior surgical techniques, lateral mass screw fixation technology has been widely used in the reconstruction surgery of the cervical spine for stability. However, currently, the finite element study on the lateral mass screw fixation reconstruction of the cervical spine is rare.
OBJECTIVE: To establish a fine normal lower cervical spine (C3-C7) three-dimensional finite element model and a reconstructed finite element model with three-segment laminectomy with lateral mass screw fixation. Then, to do an initial biomechanical analysis of the lateral mass screw fixation reconstructed lower cervical finite element model.
METHODS: We collected a normal female volunteer aged 30 years old to do CT scan for the whole cervical spine. The Dicom data were obtained. Then, the CT scanning images were dealt with software Mimics 10.01, Geomagic Studio 12.0, Solidworks2012, HyperMesh 10.1 and Abaqus 6.12 software to build the normal lower cervical spine (C3-C7) finite element model, the laminectomy finite element model and the rebuilt finite element model. At last, we analyzed the stress changes of reconstructed models under the state of flexion, extension, lateral bending and rotational motion.
RESULTS AND CONCLUSION: The lower cervical spine finite element model contained 503 911 elements and 93 390 nodes with a fine realistic appearance. It successfully passed the validation. The surgical procedure was completed in the software, and the lateral mass screw fixation reconstruction finite element model has been established. Lateral mass screw fixation system provides good stability for the postoperative finite element model. The activity of rebuilt finite element model is much lower than the normal finite element model. In the extension condition, the stress of lateral mass screw fixation system becomes strong. 


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


全文链接:

Key words: finite element analysis, computer-aided design, laminectomy, internal fixators, biomechanics

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