基于三维有限元仿真模拟的踝骨损伤生物力学分析

Biomechanical analysis of ankle injury based on three-dimensional finite element simulation

采用核磁共振扫描仪和Autodesk三维建模软件构建的踝骨实体模型,导入美国ANSYS生产的大型通用有限元分析软件中,获取踝骨三维仿真有限元数字模型,分析不同载荷下踝骨损伤生物力学的三维有限元模型,通过踝骨位移云图、踝骨应力分布云图以及踝骨应变分布云图,分析踝骨整体的位移变化,判断踝骨的受损位置和踝关节的形变量,得到踝骨在不同荷载下的等效应力、等效弹性应变和总形变情况。实验结果表明,静止中立位踝骨各组成骨发生位移会随着踝骨受到载荷力的增加而增加;内翻位踝骨受到大于1 600 N荷载容易发生骨折;不同踝骨屈服角度下,踝骨中立位随牵引力增加,距骨前移距离最大,且踝骨发生背屈屈服时的距骨位移略大于跖屈屈服。

The solid model of ankle was constructed by magnetic resonance scanner and Autodesk three-dimensional modeling software.It was imported into the large-scale general finite element analysis software(ANSYS,USA)and the digital model of three-dimensional simulation of ankle was obtained.The three-dimensional finite element model of biomechanics of ankle injury under different loads was analyzed.The displacement nephogram,stress distribution nephogram of ankle and strain of ankle were used.Distribution nephogram was used to analyze the displacement change of the whole ankle,to judge the location of the damaged ankle and the deformation of the ankle joint,and to obtain the equivalent stress,equivalent elastic strain and total deformation of the ankle under different loads.The experimental results show that the displacement of each component of ankle bone in static neutral position increases with the increase of load on ankle;the fracture of inverted ankle is prone to occur when the load is greater than 1 600 N;at different angles of ankle yield,the distance of talus forward is the largest with the increase of traction force,and the displacement of talus is slightly larger than that of metatarsal yield when the ankle back yield occurs.