Effects of Femur Amputation Length and Bone Tumor on Stress Analysis of Prosthesis Joint

• Main Authors: Tzung-ye Wu, 吳宗曄
• Other Authors: Chao-chang Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/a55hzj

碩士 === 國立臺灣科技大學 === 機械工程系 === 95 === This research is to establish a procedure of reconstructing femur solid model for FEA of prosthesis implantation of femur in oncology system. With softwares of medical image, CAD and FEA, the geometry model includes bone-visual model (BVM), bone-contour model (BCM), bone-solid model (BSM) and bone-prosthesis model (BPM) have been constructed. Mesh model for FEA has also been implemented to investigate the amputation limb ratio and effects of bone tumor. Material of isotropic and orthotropic property for cortical bone of femur have been considered in EFA. Then the amputation limb ratio by implantation prosthesis and comparison of 10 cases for stress analysis have been performed. The effects of size and location of bone tumor in femur have been analyzed with stress analysis. Results show that the amputation limb ratio is suggested to be within 40 % ~ 50 % because the maximum von Mises stress of cortical bone distributes more uniformly. Comparisons of stress analysis results of 10 cases of proximal BPM, the thicker the femur diaphysis is, the higher loading it can be sustained. The larger curvature of the femur diaphysis is, the higher bending stress occurs. If the bone tumor locates on the proximal femur or medial femur, the maximum von Mises stress increases significantly as the diameter of bone tumor reaches 20 mm. Therefore, it is recommended to replace the prosthesis of oncology system. Results of the developed BPM and FEA are expected to provide clinical information for diagnosis and therapy.