人類的足部結構，在人體與地面接觸、互動時扮演了重要的角色。足部結構不只承受著人體的重量，在移動時更可以緩衝來自於地面之震動及衝擊。近年來由於科學之進步，使得足部生物力學之研究不論在理論方法上或是量測儀器上，都有顯著的進步。使用有限元素模擬（Finite element method，FEM）可預先評估足部應力分佈狀況，以及探討足部生物力學。但欲得到較為可靠且正確的分析結果，勢必先建立一完整且合理的足部有限元素模型。在建模方面，除了幾何外型須進量符合真實結構外，建構程序亦相當重要！本研究藉重實驗室之前使用有限元素法進行生物力學分析的經驗，以電腦輔助設計之軟體建構一完整正常足部骨骼之三維有限元素模型，進而探討建構足部此一具有複雜幾何外型結構的程序與影響，以作為往後建立其它複雜結構生物力學有限元素模型之參考。
在模型建構方面，分別使用ANSYS及SolidWorks兩種電腦輔助設計軟體，以四種不同方法建立四個足部模型。從ANSYS Workbench網格化及分析的結果顯示，使用SolidWorks並依照方法四的建構流程，所得之模型不僅幾何外型接近真實足部、網格化的元素大小規則，且經收歛性測試後，von Mises stress的值趨於定值。由此可知，與其他三個模型比較起來，模型四應為合理且可被接受的結果。因此，使用SolidWorks並依照方法四建構程序，是較為適合用來建立足部此一具有複雜幾何外型結構的方法！

The foot, which plays an important role while human beings interact with the ground, is not only the weight-bearing but also the shock-absorbing structure during ambulation. Recently, the foot biomechanics has made great progress in both measurement instrumentation and theoretical methodology due to the scientific advances. Finite element method (FEM) can be utilized to evaluate the stress distribution of the foot beforehand, and probe into the biomechanics of the foot. So as to obtain reliable and precise analytic results, it is imperative to establish one intact and rational foot finite element model. While we establish such a complicated model, the geometry and establishing procedures are considerably significant. Based on the experience of using FEM to do biomechanical researches in the lab, this research used computer-aided programs to build a 3-D normal foot finite element model. Furthermore, we investigated the influence of different procedures and methods.
In this research, we used two programs - ANSYS and SolidWorks for the generation of four foot models. The results in ANSYS Workbench showed that the model 4 is better than the others, no matter in geometry or mesh. Thus it can be seen that the model 4 is more rational and acceptable than the other three models, and it is relatively the appropriate way to establish such a complicated and irregular model.

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