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KMID : 0372919990200010037
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Journal of Biomedical Engineering Research
1999 Volume.20 No. 1 p.37 ~ p.44
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Finite Element Analysis for the Contact Stress of Ultra-high Molecular Weight Polyethylene in Total Knee Arthroplasty
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Jo Cheol-Hyeong
Choe Gwi-Won
Choe Jae-Bong
Yun Gang-Seop
Gang Seung-Baek
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Abstract
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Because of bone resorption, wear of ultra-high molecular weight polyethylene(UHMWPE) in total knee arthroplasty has been recognized as a major factor in long-term failure of knee implant. The surface damage and the following harmful wear debris of UHMWPE is largely related to contact stress. Most of the previous studies focused on the contact condition only at the articulating surface of UHMWPE. Recently, contact stress at the metal-backing interface has been implicated as one of major factors in UHMWPE wear. Therefore, the purpose of the is study is to investigate the effect of the contact stress for different thickness, conformity friction coefficient, and flexion degree of the UHMWPE component in total knee system, considering the contact conditions at both interfaces. In this study, a two-dimensional non-linear plane strain finite element model was developed. The results showed that the maximum value of von-Mises stress occurred below the articulating surface and the contact stress was lower for the more conforming models. All-polyethylene component showed lower stress distribution than the metal-backed component. With increased friction coefficient on the tibiofemoral contact surface, the maximum shear stress increased about twofold.
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KEYWORD
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UHMWPE, Contact stress analysis, Finite element method, Friction
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