CAJ | 학술논문

目的建立具有详细解剖结构的人工寰齿关节置换后寰枢关节有限元模型.方法对人体正常新鲜寰枢椎尸体标本和人工寰齿关节进行薄层CT扫描,扫描数据导入Mimics软件进行寰枢椎椎骨模型和人工寰齿关节三维模型重建,然后将模型数据导入Free form软件,以临床操作为参考,将人工寰齿关节模型装配于寰枢椎模型,再导入Ansys有限元软件构建人工寰枢关节几何模型,网格划分后添加相关韧带结构,最终建立人工寰齿关节置换后寰枢关节有限元模型,模型中关节面均定为有摩擦系数的表面滑动接触关节.固定C2椎体下缘,在寰椎侧块上关节面施加40N的垂直向下载荷模拟头颅重力,并分别施加不同方向的1.53 N/m扭矩载荷,计算求解此模型在前屈、后伸、侧屈及旋转状态下的三维活动度,并与尸体标本实验测得实验数据对比进行验证.结果建立了具有详细解剖结构的人工寰齿关节置换后寰枢关节有限元模型,整个模型有103 053个单元和26 324个节点,在前屈、后伸、右侧屈及右旋转状态下,人工寰齿关节模型的活动度分别为1.6°、5.1°、4.6°和22.0°.结论初步建立人工寰齿关节置换后寰枢关节有限元模型.
목적 건립구유상세해부결구적인공환치관절치환후환추관절유한원모형.방법 대인체정상신선환추추시체표본화인공환치관절진행박층CT소묘,소묘수거도입Mimics연건진행환추추추골모형화인공환치관절삼유모형중건,연후장모형수거도입Free form연건,이림상조작위삼고,장인공환치관절모형장배우환추추모형,재도입Ansys유한원연건구건인공환추관절궤하모형,망격화분후첨가상관인대결구,최종건립인공환치관절치환후환추관절유한원모형,모형중관절면균정위유마찰계수적표면활동접촉관절.고정C2추체하연,재환추측괴상관절면시가40N적수직향하재하모의두로중력,병분별시가불동방향적1.53 N/m뉴구재하,계산구해차모형재전굴、후신、측굴급선전상태하적삼유활동도,병여시체표본실험측득실험수거대비진행험증.결과 건립료구유상세해부결구적인공환치관절치환후환추관절유한원모형,정개모형유103 053개단원화26 324개절점,재전굴、후신、우측굴급우선전상태하,인공환치관절모형적활동도분별위1.6°、5.1°、4.6°화22.0°.결론 초보건립인공환치관절치환후환추관절유한원모형.
Objective To develop and validate an anatomic detailed finite element model of atlanto-axial joint following artificial atlanto-odontoid joint arthroplasty.Methods The normal fresh human specimens of atlas and axial and artificial atlanto-odontoid joint were subjected to CT scan.Three-dimensional model was established by Mimics software.According to clinical practice,dealing with atlas and axial and assembling artificial atlanto-odontoid joint by Freeform.After constructing the geometric model and meshing the solid model using tetrahedral solid elements,adding the relevant ligament structure,the meshed model was acqujred and finished by Ansys at last.The ligaments were modeled with tension-only spring elements with bilinear modulus of elasticity data according to neutral and elastic zones.The ligaments of model includes:atlantoaxial joint capsule and ligaments,facet joint capsular ligament,interspinous ligament,supraspinous ligament.Sliding contact definitions with friction were used for all the facet joints.In the analysis,the weight of the skull was simulated by applying vertical load of 40 N on the fixed handle,and the inferior surface of the C2 venebral body was fully constrained but the upper part of the atlas without any constraints.Pure moment loading of 1.53 N.m was applied to the fixed handle to simulate various movements of the atlanto-axial joint under flexion,extension,lateral bending and axial rotation configurations.The the range of motion (ROM) of model under different direction were evaluated biomechanically.To validate the finite element model in term of ROM compared against the experimental data by Yong Hu at al.Results The model consists of 26324 nodes and 103053 elements,In the conditions of flexion,extension,righe flexion and right rotatio,the ROM of the artificial atlanto-odontoid joint are 1.6°,5.1 °,4.6 ° and 22.0°,that is correlated well with the results by Yong Hu at al.Conclusion The anatomic detailed finite element model realistically simulates atlanto-axial joint following artificial atlanto-odontoid joint arthroplasty and facilitate the further biomechanical research,and for further optimization of artificial atlanto-odontoid joint.