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 Study of the influence of the contact model on the dynamic response of a biomechanical multibody knee model
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/8364

title: Study of the influence of the contact model on the dynamic response of a biomechanical multibody knee model
authors: Machado, Margarida
Flores, Paulo
Ambrósio, Jorge
Completo, António
keywords: Knee model
Dynamic response
Knee Conformality
Contact Laws
Contact Materials
Multibody Dynamics
issue date: 2011
abstract: This work presents a study of the influence of the contact model on the dynamic response of the human knee joint. For this purpose a multibody knee model composed by two rigid bodies, femur and tibia, and four nonlinear springs that represent the main knee ligaments, was used. Computational simulations were performed to investigate and compare three modeling parameters, namely contact law, contact geometry and material properties. The contact laws considered here are the Hertz, the Hunt-Crossley and the Lankarani-Nikravesh models. This study showed that Hertz law is less appropriate than the other two models to describe the dynamic response of cartilage, because it does not account for its viscoelastic nature. Since knee can exhibit conformal and non-conformal contact scenarios, three distinct geometrical models for femur-tibia were considered: convex sphere-plane, convex-convex spheres and convex-concave spheres. The highest level of contact forces was obtained for the conformal scenario. Concerning to the influence of the properties of the contacting materials, the dynamic response of a healthy knee was compared to three pathologic and two artificial knees. The results demonstrated that the cartilage reduces the peak force experienced by the models without cartilage and extend the impact loading period over a longer time.
URI: http://hdl.handle.net/10773/8364
publisher version/DOI: http://www.spbiomecanica.com/congresso/4/
source: 4º Congresso Nacional de Biomecânica
appears in collectionsMEC - Comunicações

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