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題名 | The Contact Stress on the Polyethylene Surface of a Rotating Hinged Knee Prosthesis= |
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作者 | 楊榮森; 林輝政; 劉堂桂; 劉華昌; 韓毅雄; Yang, Rong-sen; Lin, Huei-jeng; Liu, Tang-kue; Liu, Hwa-chang; Hang, Yi-shiong; |
期刊 | 中華民國骨科醫學會雜誌 |
出版日期 | 19980300 |
卷期 | 15:1 1998.03[民87.03] |
頁次 | 頁1-9 |
分類號 | 416.26 |
語文 | eng |
關鍵詞 | 關節置換術; 有限元素分析; 接觸應力; Rotating-hinge; Knee prosthesis; Pressure films; Finite element analysis; Contact stress; |
英文摘要 | The advance of chemotherapy and modern image studies enabled the development of limb salvage procedures for treatment of primary malignant bone tumors in the extremity. In the recent decade, some tumor knee prostheses have incorporated a rotating hinge which provides an axial freedom and releases the torque during motion. We have observed the wear on polyethylene surface of a retrieved rotating hinged knee prosthesis. In this study we used pressure measuring films (Fuji Prescale film)and finite element (FE) models (ABAQUS FE program) to investigate the contact stresses on the polyethylene surface of a rotating hinged prosthesis with a cylindrical contact interface. A contact force of about 280 kgf was selected for the computations of the contact stresses at rotation angles of 0 °, 4 ° and 8 °.The results of Prescale film studies showed two regions of high local pressure at the edge, up to 30 Mpa, at 4 ° and 8 ° rotation The maximum shear stress(von Mises stress)for FE model was uniform at 0 ° rotation whereas two stress concentration regions occurred at 4 ° and 8 ° rotation with 36.98 and 57.59 MPa, respectively. They were higher than tensile and yield strength of the ultra-high-molecular weight polyethylene(UHMWPE) (40 and 20 MPa, respectively). The regions of high local pressures corresponded to the eroded polyethylene surface of the retrieved prosthesis. In conclusion, the contact interface was high during rotation of the rotating hinge with cylindrical contact interface. Therefore careful protection from excessive rotation after operation is important in reducing contact stress and the associated wear process. |
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