静载荷作用下骨盆三维有限元分析及其生物力学意义  

Three-dimensional finite element analysis of pelvis under static loading and its biomechanical significance

作　　者：苏佳灿[1] 张春才[1] 陈学强[2] 王保华 吴建国[2] 丁祖泉[2] 

机构地区：[1]解放军第二军医大学长海医院骨科,上海市200433 [2]同济大学生命科学与技术学院,上海市200092 [3]图美克医学软件科技研究所,上海市200433

出　　处：《中国临床康复》2005年第6期66-67,i003,共3页Chinese Journal of Clinical Rehabilitation

摘　　要：目的:探讨骨盆受到静力载荷作用后的力学行为特征,为临床分析及判断骨盆力学分布、静载荷影响提供力学基础。方法:实验于2002-01/2004-04在第二军医大学长海医院骨科实验室和同济大学生命科学与技术学院生物力学实验室完成。采用计算机仿真模拟方法,将所构建骨盆三维实体模型导入三维有限元分析软件ANSYS7.0,分别计算单侧髂前上棘和单侧髂骨正后方静载荷作用下骨盆的力学行为表现,静载荷为8000N,分析主应力值、应力分布情况以及主应力方向上骨盆单元的位移。结果:单侧髂前上棘侧方加载下,应力沿着受力点与骶髂关节连线方向传导,没有应力沿着髋臼或者耻骨、坐骨传导;单侧髂骨后方静载荷加载时,应力沿着髂骨纵行方向、髂骨与骶髂关节部位连线方向、同侧耻骨上支传导。结论:分析静载荷作用下骨盆各部位应力分布以及骨盆各个单元在应力作用下的位移变化,有助于临床上进行骨盆损伤内固定力点的选择以及进一步明确骨盆内在应力值分布。AIM:To investigate the mechanical characteristic of pelvis under static loading and provide a mechanical basis for clinically analyzing and judging mechanical distribution of pelvis and influence of static stress.METHODS:The study was conducted in the laboratory of Department of Orthopaedics,Changhai Hospital,Second Military Medical University of Chinese PLA and laboratory for biomechanics,College of Life Science and Technology,Tongji University from January 2002 to April 2004.By means of computer simulation,the constructed pelvic three dimensional(3D) model was read to input into 3D finite element analysis software ANSYS 7.0.The pelvic mechanical behavior was calculated and the main stress value,stress distribution and pelvic unit displacement in the direction of main stress were analyzed when unilateral anterior superior iliac spine and unilateral anterior posterior ilium was loaded by 8 000 N static stress.RESULTS:When unilateral anterior superior iliac spine was loaded,the stress transmitted from the suffered point to cacroiliac joint,and no stress transmitted to acetabulum,pubis or ischium.When unilateral anterior posterior ilium was loaded,the stress transmitted to three directions:vertical direction of ilium,from ilium to sacroiliac joint direction,and the same side of pubic superior ramus.CONCLUSION:The stress distribution of pelvis and displacement of units loaded under static stress are analyzed helpfully to clinically choose the internal fixation point for pelvic fracture and further ascertain the stress distribution of pelvis.

关 键 词：骨盆 生物力学 可行性研究 

分 类 号：R496[医药卫生—康复医学]