摘要
目的利用骨盆的三维有限元模型研究外旋应力对骨盆的作用机制。方法 1例健康成年男性志愿者进行PET-CT扫描,结果以DICOM格式输出,在PC机上进行三维重建,建立正常骨盆的有限元模型。对模型施加外旋载荷,经计算得到应力、应变及位移云图。结果水平向后加载500N于左侧髂前上棘,应力沿两条途径传导:一条是向内后方经同侧骶髂关节前部至骶骨上部,另一条是向前方经耻骨支、耻骨联合至对侧耻骨;且骨盆前环受力较大。应变以同侧骶髂关节前下方最大,前方的耻骨联合处应变也较大。位移以受力点同侧髂前上棘处最大,同侧髂骨、坐骨及耻骨支位移均较大。结论外旋载荷易造成耻骨支骨折、骶髂关节损伤,或骶骨压缩骨折。
Objective To study the mechanics of pelvis under extorsion loading using three-dimensional finite element model（FEM）.Methods A healthy adult male volunteer was chosen to undergo PET-CT scanning.The initial images of pelvis were output to PC.Next a three-dimensional reconstruction and a finite element model were made.An extorsion loading was put to the model.The horizontal loading reached to the left anterosuperior iliac spine posteriorly.Then the stress,strain and displacement nephograms were obtained and the biomechanical features were analyzed.Results The stress conducted through the two ways.Firstly,it was rearwards to the superior part of the sacrum passed the sacroilial joint at the same side.Secondly,the stress passed forward to the pubis at the opposite side.The loading of the anterior ring of pelvis was relatively greater than that of other parts.The peak value of stain appeared at the antero-inferior part of the sacroilial joint at the same side.The peak value of displacement was at the loading point.The displacement at ilium,ischium and ramus of pubis at the same side were relatively greater.Conclusions The extorsion stress easily cause the fractures of pubic branch fracture,the damage of sacroilial joint,or the compressed fracture of sacrum.
出处
《中国临床解剖学杂志》
CSCD
北大核心
2010年第6期683-685,共3页
Chinese Journal of Clinical Anatomy
关键词
骨盆
有限元分析
外旋载荷
生物力学
Pelvis
Finite element analysis
Extorsion stress
Biomechanics
