足部三维有限元模型的建立和跗跖关节模拟碾伤生物力学特性

目的 通过CT数据对人体足部主要结构进行三维有限元模型建立,并对跗跖关节进行准稳态有限元受力分析.方法 对一成年女子行足部螺旋CT扫描,将所得图像经Mimics、GUG、ANSYS等软件处理得到三维有限元数字模型,并对跗跖关节进行准稳态有限元力学分析.结果 建成了足部包括全部骨骼、韧带、皮肤、软组织的三维有限元数字模型,并在正常及模拟碾压伤情况下对跗跖关节进行了有限元应力分析.结论 在正常及模拟碾压伤情况下第二跖骨所受应力最大并集中于第二跖骨基底部.

Establishment of 3-D finite element model of foot and biomechanical study of tarsometatarsel joints under quasi-static load

Objective To establish three-dimensional reconstruction and the finite element model of the foot from the CT data and to analyze finite element of the tarsometatarsal joints in quasi-static load. Methods An adult woman underwent spiral CT scanning on foot. The obtained images were processed by Mimics、Ansys and GUG for the establishment of three-dimensional finite element digital model. Then a finite analysis of the tarsometatarsal joints in quasi-static load was made. Results The three-dimensional finite element digital model was established, including all the bones, the main ligaments, the skin and the soft tissue of foot. The finite element analysis of the tarsometatarsal joints in normal conditions and in the crushing injuries was carried out. The images of equivalent stress distribution were obtained. Conclusions In the stress of the tarsometatarsal joints M2 is larger than others in these conditions. The stress of M2 is focused on the base and the plantar sides.