在不同動作時犬股骨的應力分佈資訊對獸醫執行手術及工程師設計植入物時是非常重要的，以有限元素法來分析應力及評估人工髖關節之優劣是目前常見的方式，因此，本研究希望能建立一完整的3D黃金獵犬股骨實體模型，且探討植入物（林上智老師設計）在植入後其股骨的應力分佈情形，並與完整股骨做比較，藉此評估此人工髖關節在臨床上的可行性，並作為日後手術或其他學術研究的參考。 首先利用Armira軟體讀取黃金獵犬股骨CT斷層掃描影像並建立實體模型，透過SolidWork軟體讀取模型在模擬手術植入人工股骨柄，最後利用Cosmos做有限元素分析，而Cosmos可以直接針對組合模型生成實體網格。 由分析的結果得知，在完整股骨的應力分佈情形上，股骨會產生一向股骨後側旋轉之扭力與向股骨前側彎曲之彎矩，且在幹中間遠端方向有較高應力發生，而術後股骨應力分佈情形趨勢上與原完整股骨差異不大，此外，就植入物而言，最大的張應力在股骨柄後側孔洞位置產生，但並不會造成股骨柄的損壞，可提供臨床上一植入物的選擇。 Information regarding the stresses and strains in the canine femur during various activities is important for veterinary orthopeadic surgeons, engineers designing implants for dogs. Finite element analysis has commomly been used to investigate the effect of stress distribution following hip replacement. Therefore, the objective of the current study is to reconstruct the three-dimensional solid model of GOLDEN RETRIEVER and investigate the biomechanical performance of a prosthesis（designed by Dr. Lin）by comparing the stress distributions with the intact canine femur. Assess this prosthesis and face the feasibility in clinic, is regarded as the reference of future operation or other academic research by this. An image-processing software（Armira）was used to process the sectional computed tomography images of a GOLDEN RETRIEVER femur and to reconstruct the solid model of the bone. Then the solid model of the bone was transferred to a CAD program（Soliworks）to simulate the implantation of a hip prosthesis. Finally, the finite element analysis was performed using a finite element package（Cosmos）with the proper setting of boundary and losding conditions. The results can be summarized as : the torsion and the bending moment was occurred on the femur and the peak effective stress was reached at the caudo-medial diaphysis. We found that the implanted femur has physiological stress distribution on the intact femur. Furthermore, as far as prosthesis be concerned the peak tensile stress occurred in the hole of the posterior diaphysis. Nevertheless, the prosthesis was not broken. It can provide immediate stabilization of the implant and the preservation of endosteal vascularity.
