CAJ | 학술논문

目的:建立上颈椎(CO-C3)的三维有限元模型(FEM),通过此模型对寰椎进行初步的牛物力学分析.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、屈曲化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,儿何相似性好,共包含110105个节点,91469个单元;(2)应用上颈椎模型(CO-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犁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.
목적:건립상경추(CO-C3)적삼유유한원모형(FEM),통과차모형대환추진행초보적우물역학분석.방법:통과CT소묘획취1례건강성년남성상경추적공간결구신식,이용Mimics연건급Ansys연건건립상경추유한원모형;분별재완정적상경추모형급단독응용모형중적환추분석두로위우중립위、굴곡화이급후신위등조건하환추소수응력적변화정황.결과:(1)소건상경추적유한원모형외형핍진,인하상사성호,공포함110105개절점,91469개단원;(2)응용상경추모형(CO-C3)재침골상가재면압력,모의두로위우중립、전굴、후신위시,환추전궁수력최대,기차시후궁급측괴;(3)단독응용환추모형,직접재환추상관절면가재력,모의두로재중립、전굴、후신위시환추최대응력집중우전궁,차급응력집중구역위측괴급후궁여측괴적교계처;직접재후궁가재력모의두부과도후신시,최대응력집중우후궁여측괴교계처.결론:응용CT소묘획취상경추공간결구신식건립적상경추모리가용우생물역학실험,무론두로위우굴곡위、중립위혹자후신위,당수종향작용력시,환추전궁시응력최집중적부위;두부과도후신시,후궁여측괴교계처시응력최집중적부위.
Objective:To construct a three-dimensional upper cervical spine (CO-C3) finite element model and make the preliminary biomeehanieal analysis to arias 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 (CO-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 CO-C3 was geometrically resemble,composed of 110105 node points and 91469 elements.(2)In the holo-model of upper eervieal spine,when load was ap-plied 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 CO-C3 can simulate the natural condition of cervical spine and facilitate the further biomeehanieal 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 ex-ceeding back extension,the largest stress force focused on lateral mass of the posterior arch of the atlas.