頁籤選單縮合
題 名 | Finite Element Stress Analysis of the Femur wtih Implant Utilizing Computed Tomography |
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作 者 | Chu,Tai-ming; Chag,Wei-chun; Linded,Martin; Robbins,Steven G.; | 書刊名 | 醫學工程 |
卷 期 | 9:1 1997.02[民86.02] |
頁 次 | 頁36-40 |
分類號 | 410.1644 |
關鍵詞 | Finite element analysis; FEA; Stress; Computer aided design; CAD; Comprted tomography; CT; Femur; Prosthesis; Hip replacement; Bone Remodeling; Resorption; Stress shielding; Cobalt-chromium alloy; Titanium alloy; Porous coating; Cement; Fatigue; Elastic modulus; Poisson's ratio; |
語 文 | 英文(English) |
英文摘要 | Three 3-D finite element models (FEM) of a femur together with the hip prosthesis were developed using the computer aided design (CAD) program ANSYS and computed tomography (CT). Finite elements stress analysis (FEA) on the FEM of three different femora with various types hip prosthesis such as cobalt-chromium alloy, titanium alloy, cemented, and porous-coated were conducted. A total of 1264 3-D solid elements, and 1371 nodal points were used. All prosthetic materials used in the FEM were assumed to be linear, homogeneous, and isotropic. Simulation results revealed that the cobalt-chromium alloy prosthesis has a peak stress of 12% of the fatigue limit; and it unloads the calcar cortical bone stress. The titanium alloy prosthesis has a peak stress of 4% of the fatigue limit; and it decreases the stress within the prosthetic stem except at the proximal side. When comparing the porous coated prosthesis with the cemented one, the porous coated prosthesis decreases bone stresses and bone/prosthesis interface stress. In addition, the porous coated prosthesis has a more uniformly distributed stress in the bone tissue than cemented one. Decreasing the elastic modulus and the poisson's ratio of the porous coated layer decreases the interfaces stress between cancellous bone and the porous coating layer. Bone hypertrophy around the distal end of the prosthesis decreases the stress (up to 35%) in the distal prosthetic stem and the femoral surface. |
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