摘要
目的通过建立足部的三维有限元模型,模拟在不同速度载荷下以及不同后足位置时的跟骨损伤模式。方法基于足部CT数据建立包括骨骼、软组织和韧带,考虑材料的非线性和关节接触的足部三维有限元模型。应用有限元分析软件ABAQUS6.8对建立的足部有限元模型进行非线性显式分析。当后足处于内翻和外翻的不同位置时,施加不同的速度载荷,模拟跟骨应力情况,观察跟骨应力特点。结果距下关节内翻时的应力集中在跟骨后内侧,外翻时的应力集中在跟骨前外侧。在相同速度载荷下,距下关节外翻时的应力值、应力范围以及跟骨应变能明显小于内翻时的结果。结论距下关节内翻时产生的骨折线更倾向于出现在后距下关节的后内侧,骨折程度相对重。距下关节外翻时的骨折线将出现在后距下关节前外侧,骨折程度相对轻。通过建立三维有限元模型,进行冲击试验的有限元分析,可以更直观观察骨折的发生模式。有限元分析是生物力学试验的良好补充。
Objective We built the three-dimensional finite element model to analyze the patterns of calcaneal fractures in different hindfoot positions under different impact loads.Methods A 3D anatomically detailed non-linear finite element analysis of standard human foot model was set up,which was based on computed tomography （CT） scan data including skeletons,soft tissues and ligaments.The non-linear analysis was performed in ABAQUS6.8.1.During the analysis,we simulated several impact loads by giving the different velocities （5m/s-8m/s） to the hindfeet in valgus and yarus positions.Results In a valgus position,the stress focused on the posteromedial section of the posterior subtalar facet.In the varus position,the stress focused on anterolateral section.Under the same impact energy,the quantity of stress in varus position was significantly higher than the stress in valgus position.Conclusions Intraarticular calcaneal fracture exhibiting a medial primary fracture line is associated with a more severe fracture pattern.The position of hindfoot decides the location of primary fracture line.We can observe the stress more directly by building the finite element models and performing the impact analysis.The finite element analysis acts as an excellent method in biomechanical research.
出处
《山东医药》
CAS
2013年第38期21-24,共4页
Shandong Medical Journal
