CAJ | 학술논문

目的建立腰椎椎弓峡部裂三维有限元模型,通过生物力学实验进行有效性验证.方法利用临床1例腰椎椎弓峡部裂病例影像学资料,采用Simpleware建模软件分别模拟下腰椎骨性结构、椎间盘组织,并在Ansys软件附加腰椎相关韧带和关节囊,建立L5双侧椎弓峡部裂三维有限元模型,并通过体外力学实验结果验证模型有效性.结果重建模型构建了椎体皮质骨、松质骨、腰椎关节突关节、椎弓根、椎板、横突、棘突等骨性结构,还构建了纤维环、髓核、上下终板组织,并成功附加了前纵、后纵韧带、黄韧带、棘上、棘间韧带以及关节突的关节囊.模型共计有281 261个节点和661 150个单元.腰椎椎弓峡部裂重建成功.通过与体外生物力学在不同工况下L4下关节突、L5上、下关节突、S1上关节突应力/应变趋势以及L4下关节突内外侧力学应力/应变趋势比较,验证了模型的有效性.结论建立了下腰椎椎弓峡部裂的三维有限元模型,此模型可以用来进一步实施有关峡部裂治疗的力学研究.
목적 건립요추추궁협부렬삼유유한원모형,통과생물역학실험진행유효성험증.방법 이용림상1례요추추궁협부렬병례영상학자료,채용Simpleware건모연건분별모의하요추골성결구、추간반조직,병재Ansys연건부가요추상관인대화관절낭,건립L5쌍측추궁협부렬삼유유한원모형,병통과체외역학실험결과험증모형유효성.결과 중건모형구건료추체피질골、송질골、요추관절돌관절、추궁근、추판、횡돌、극돌등골성결구,환구건료섬유배、수핵、상하종판조직,병성공부가료전종、후종인대、황인대、극상、극간인대이급관절돌적관절낭.모형공계유281 261개절점화661 150개단원.요추추궁협부렬중건성공.통과여체외생물역학재불동공황하L4하관절돌、L5상、하관절돌、S1상관절돌응력/응변추세이급L4하관절돌내외측역학응력/응변추세비교,험증료모형적유효성.결론 건립료하요추추궁협부렬적삼유유한원모형,차모형가이용래진일보실시유관협부렬치료적역학연구.
Objective To construct three-dimensional finite element model of lumbar spondylolysis,then to verify its validity by comparison of biomechanics in vitro.Method According to the radiological data of a patient with lumbar spondylolysis,the bone and intervertebral disc of L4-S1 were reconstructed by Simpleware software.The lumbar attaching ligaments and articular capsule were added into simulating model by Ansys software.The three-dimensional finite element model of lumbar spondylolysis was finally simulated successfully,and validated by lumbar spondylolysis biomechanical experiment in vitro.Results The reconstruction of digital model contained the bones of lumbar spine which include vertebral cortical bone,cancellous bone,facet joint,pedicle,lamina,transverse process and spinous process,as well as the annulus fibrosus,nucleus pulposus,superior and inferior end-plates.Besides,anterior and posterior longitudinal ligaments,flavum ligament,supraspinal and interspinal ligaments and articular capsule of facet joint are also attached.The model consisted of 281,261 nodes and 661,150 elements.Imitation of spondylolysis is well done in this model.The validity of the model was verified by comparison of the results of biomechanics in vitro which involved in the trends under loading of stress/strain of L4 inferior facet process,L5 superior and inferior facet process,S1 superior facet process and the trends of stress/strain of lateral and medial L4 inferior facet process.Conclusions Three-dimensional model of lumbar spondylolysis is reconstructed using finite element analysis,and can be further used in the research in biomechanics of lumbar spondylolysis.