摘要
目的:建立上颈椎(C0-C3)的三维有限元模型(FEM),通过此模型对寰椎进行初步的生物力学分析。方法:通过CT扫描获取1例健康成年男性上颈椎的空间结构信息,利用Mimics软件及Ansys软件建立上颈椎有限元模型;分别在完整的上颈椎模型及单独应用模型中的寰椎分析头颅位于中立位、屈曲位以及后伸位等条件下寰椎所受应力的变化情况。结果:(1)所建上颈椎的有限元模型外形逼真,几何相似性好,共包含110105个节点,91469个单元;(2)应用上颈椎模型(C0-C3)在枕骨上加载面压力,模拟头颅位于中立、前屈、后伸位时,寰椎前弓受力最大,其次是后弓及侧块;(3)单独应用寰椎模型,直接在寰椎上关节面加载力,模拟头颅在中立、前屈、后伸位时寰椎最大应力集中于前弓,次级应力集中区域为侧块及后弓与侧块的交界处;直接在后弓加载力模拟头部过度后伸时,最大应力集中于后弓与侧块交界处。结论:应用CT扫描获取上颈椎空间结构信息建立的上颈椎模型可用于生物力学实验,无论头颅位于屈曲位、中立位或者后伸位,当受纵向作用力时,寰椎前弓是应力最集中的部位;头部过度后伸时,后弓与侧块交界处是应力最集中的部位。
Objective：To construct a three-dimensional upper cervical spine （C0-C3） finite element model and make the preliminary biomechanical analysis to atlas by using this model.Method：The cervical spine of a healthy adult man was scanned by Siemens Somatom Sensation 64 with 0.6mm thickness without any interval, the data was saved with DICOM format.The finite element model of upper cervical spine was established by means of Mimics and ANSYS software.Based on the model of atlas and holo-model of upper cervical spine （C0-C3）,the stress of different position of atlas was analyzed while the skull was in neutral,flexion and pos- terior extension position.Result： （1）The finite element model of C0-C3 was geometrically resemble,composed of 110105 node points and 91469 elements.（2）In the holo-model of upper cervical spine,when load was applied on occipital bone,the Von Mises stress on the anterior arch was biggest and the smaller stress was on the posterior arch and lateral masses no matter what position the skull was.（3）In the model of atlas,when load forced on superior articular facet of atlas,the biggest Von Mises stress focused on the anterior arch and the smaller was on the posterior arch and lateral masses.When the load forced on posterior arch and skull in overextension, the biggest stress significantly focused on the juncture of lateral mass and the posterior arch of the atlas,Conclusion：The finite element model of C0-C3 can simulate the natural condition of cervical spine and facilitate the further biomechanical research.The axial loading will cause the stress force focused on the anterior arch what position including median,flexion or extension of the head is, but when head is in exceeding back extension, the largest stress force focused on lateral mass of the posterior arch of the atlas.
出处
《中国脊柱脊髓杂志》
CAS
CSCD
北大核心
2009年第7期530-534,共5页
Chinese Journal of Spine and Spinal Cord
关键词
有限元
上颈椎
寰椎
骨折
生物力学
Finite element
Upper cervical spine
Atlas
Fracture
Biomechanics
