CAJ | 학술논문

目的建立正常人及骨质疏松患者腰椎三维有限元模型,观察骨质疏松导致的骨结构及性质的改变对骨生物力学的影响.方法选择健康及骨质疏松老年女性患者各1例,通过CT扫描获得志愿者腰椎数据,Mimics10.0软件生成腰椎三维模型；将三维模型数据导人Hypermesh 10.0软件进行网格划分,建立有限元模型；根据腰椎CT灰度值对三维模型赋10种材料属性后,导入Abaqus 6.9内施加载荷、设置边界条件等操作建立正常及骨质疏松腰椎三维有限元模型,观察腰椎最大米塞斯应力(yon mises stress)、最大位移、最大轴向应变3项指标.结果建立正常人和骨质疏松患者第五腰椎(L5)三维有限元模型；日常生理载荷作用下,正常人L5产生的最大von mises stress、最大位移、最大轴向应变分别为4.171 Mpa、1.693e-2mm、5.508e-5；骨质疏松患者L5产生的最大von mises stress、最大位移、最大轴向应变分别为4.451Mpa、3.822e-2 mm、1.414e-4.结论日常生理载荷作用下,骨质疏松患者和正常人L5所产生的应力无明显差异.但骨质疏松患者腰椎更容易产生应力集中,抵御载荷储备能力降低.
목적 건립정상인급골질소송환자요추삼유유한원모형,관찰골질소송도치적골결구급성질적개변대골생물역학적영향.방법 선택건강급골질소송노년녀성환자각1례,통과CT소묘획득지원자요추수거,Mimics10.0연건생성요추삼유모형；장삼유모형수거도인Hypermesh 10.0연건진행망격화분,건립유한원모형；근거요추CT회도치대삼유모형부10충재료속성후,도입Abaqus 6.9내시가재하、설치변계조건등조작건립정상급골질소송요추삼유유한원모형,관찰요추최대미새사응력(yon mises stress)、최대위이、최대축향응변3항지표.결과 건립정상인화골질소송환자제오요추(L5)삼유유한원모형；일상생리재하작용하,정상인L5산생적최대von mises stress、최대위이、최대축향응변분별위4.171 Mpa、1.693e-2mm、5.508e-5；골질소송환자L5산생적최대von mises stress、최대위이、최대축향응변분별위4.451Mpa、3.822e-2 mm、1.414e-4.결론 일상생리재하작용하,골질소송환자화정상인L5소산생적응력무명현차이.단골질소송환자요추경용역산생응력집중,저어재하저비능력강저.
Objective To set up the three-dimensional finite element model of lumbar in normal people and osteoporotic patients,and to evaluate the effect of the geometry and the materrial properties differentiation caused by osteoporosis on the load distribution and on stress and strain fields evaluated by FEA were examined.Methods One healthy female and one female patient with severe osteoporosis were selected.The data were obtained by means of spiral CT scanning.Three-dimensional model were established by Mimics 10.0 software.Two models were chosen and modified in Hypermesh 10.0 software to generate mesh.Attributes of materials were given to establish model of three dimensional finite element.Import the model into Abaqus6.9 to analyze biomechanical characteristics.Results L5 three dimensional finite element models in normal people and osteoporotic patients were successfully established.In the healthy LS,the maximum value of von mises stress was 4.171 Mpa,the peak value of axial displacement was 1.693e-2 mm,and the peak value of the axial strain was 5.508e-5.In the osteoporotic LS,the maximum value of yon mises stress was 4.451 Mpa,the peak value of axial displacement was 3.822e-2 mm,and the peak value of the axial strain was 1.414e-4.Conclusion The stress was not higher in the osteoporotic L5 than in the healthy one for a normal daily loading situation.Compared to the healthy one,the osteoporotic L5 structure is prone to stress concentration,and not to infrequent "error" loads.