骨盆髋臼模型不同加载方式的力学变化及其临床意义  

Mechanical change and clinical significance of model of pelvis and acetabulum loaded with different ways

作　　者：许硕贵[1] 佟大可[1] 苏佳灿[1] 张春才[1] 蔡郑东[1] 吴建国[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]同济大学生物力学研究中心,上海市200433

出　　处：《中国临床康复》2006年第29期110-111,117,i0004,共4页Chinese Journal of Clinical Rehabilitation

基　　金：上海市基础重点基金资助(03JC14008)~~

摘　　要：目的:对模仿站立及坐位两种状态对骨盆髋臼加载后进行三维有限元模型力学分析,观察相关力学参数变化。方法:①湿髋臼标本模型来源于解放军第二军医大学解剖学教研室。髋臼:对一具成年湿骨盆尸体标本行CT扫描成像得到每层横截面图像,提取边界坐标,利用有限元分析软件ANSYS5.6构建髋臼三维模型,并划分为121239个结点、112491个单元。同时将骶髂关节和耻骨联合部位锁定,模仿站立位对髋臼加载,力的方向按股骨颈力线方向,大小为400N(约80kg体质量一半)。分析加载后髋臼的三维力场分布。②骨盆模型:2004-08从自愿者中随机选取正常成年男性,然后行CT扫描。CT扫描范围从第3腰椎至坐骨结节,将扫描后图像用ANSYS5.6软件构建正常骨盆模型,并划分为356710个单元格。固定好正常骨盆模型的两侧坐骨结节,模仿坐位对骨盆加载,于腰椎上施加一竖直向下的力,大小为500N,方向与Z轴相反,通过有限元分析计算获取应力分布图像。结果:①髋臼三维有限元模型模仿站立位加载后在耻骨支、坐骨支、方区部、骶髂关节部、髋臼后壁部有较高应力出现,单元结构所受到的平均等效应力为(11.578～23.437)MPa。②骨盆三维有限元模型模仿坐位加载后在骶髂关节及坐骨结节部有较高应力出现,单元结构所受到的平均等效应力为(15.734～20.286)MPa。结论:实验结论提示,骨盆髋臼骨折的内固定应强调以满足术后早期卧床功能训练为目的的有效内固定,避免早期负重。AIM： To analyze the three-dimensional finite element model by loading the model of pelvis and acetabulum with standing and sitting postures, then to observe the change of relevant mechanical parameters. METHODS： ① Moist acetabulum models were from the Staff Room of Anatomy , Second Military Medical University of Chinese PLA . Acetabulum： an adult moist cadaver pelvis was obtained and performed CT scanning, then we got＇the images of every slice. With the software ANSYSS.6, we construct the three-dimensional model of acetabulum, which was divided into 121 239 nodes and 112 491 units. At the same time, the united part of cacroiliac joint and pubis was locked. Acetabulum Was loaded by simulating standing, and the direction was along the neck force line of femur. The force was about 400 N （half about 80 kg body mass）. The Threedimensional force distribution of acetabulum was analyzed after being loaded. ②Pelvic model： In August 2004, a normal male adult was randomly selected and performed CT scanning from the third vertebra to the sciatic tuberodties, the images obtained from CT scanning were constructed to three-dimensional model of pelvis with the software ANSYSS.6. The model was divided into 356 710 units. Bilateral sciatic tuberodties of normal pelvis were fixed. The pelvis was loaded by simulating sitting, with a 500 N force opposite to Z-axis pressuring on lumbar vertebrae erectly. Stress distribution image was calculated through finite element analysis. RESULTS： ①Big value stresses were distributed in rami ossis pubis, rami ossis ischii, square area, articulationes sacroiliaca, posterior wall of acetabulum of the acetabular model after the three-dimensional finite models were loaded by simulating standing, and the mean equivalent stress of each unit was （11.578-23.437 ） Mpa. ② High value stress appeared in cacroiliac joint and sciatic tuberodties after the three-dimensional finite element model of pelvis was loaded by simulating sitting, and the mean equivalent stress of each uni

关 键 词：骨盆 髋臼 骨折 成像 三维 

分 类 号：R496[医药卫生—康复医学]