人在摔倒时股骨上端承载能力的有限元分析——(II)摔跤姿态和载荷位置对股骨承载能力的影响研究

Finite Element Analysis (FEA) for the Structure Capacity of Proximal Femur During Falling——(II) The Effects of Falling Configuration and Load Locations on the Structural Capacity of the Proximal Femur

我们用有限元模型结合Hoffman失效准则参数化地研究了载荷条件对股骨承载能力的影响。载荷条件包括摔跤姿态角,载荷施加位置及髋关节间的摩擦阻力。参数化研究结果表明载荷施加位置是影响股骨承载能力的关键因素;当外载荷作用在股骨头部时,有两个股骨承载能力的低谷区,如果外载施加在这两个区域,则股骨颈极易发生骨折;髋关节间的摩擦阻力可严重地影响股骨承载能力,这对骨关节炎患者有很大的内在意义。

The effects of loading conditions on the structural capacity of the proximal femur were investigated parametrically by Finite Element Analysis （FEA） combined with Hoffman failure criterion. The loading conditions included the fall configuration angles, load locations and the friction resistance in hip joint. The results of this parametric study revealed that the load locations are the keys to determining the structural capacity of the proximal femur. There are two low peaks of the structural capacity when the loads are applied to femoral head. If the impact load were applied in this area, the fracture risk would be great. The frictional resistance of the hip joint can severely affect the failure load, which has far reaching implications in terms of osteoarthritis.