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Journal of Industrial and Engineering Chemistry, Vol.6, No.6, 437-441, November, 2000
Physical Properties of Ultra-High Molecular Weight Polyethylene in Retrieved Artificial Knee Joint
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Physical properties of ultra-high molecular weight polyethylene (UHMWPE) in retrieved artificial knee joints were investigated. Lamella thickness, crystallinity, and mechanical chain scission appeared to increase during service. Crystallinity-depth profile was related to the conformity of joint and the thickness of tibial component. For the joint of low conformity, stress, crystallinity, and lamellae alignment were highest at subsurface 1-2 mm beneath the surface, where crack propagation and delamination eventually occurred. It was suggested that the thickness and conformity of UHMWPE part should be increased for better wear-resistant tibial component of knee joint prosthesis.
Keywords:Ultra-High Molecular Weight Polyethylene (UHMWPE);Retrieved Artificial Knee Joints;Crystallinity-Depth Profile;Conformity;Thickness
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