Biomechanical Behavior of the Knee Joint, Using ANSYS

One of the most important joint in the human body is the knee joint. Many papers have been published about it, but most of these works use simplified models, using 2D or some using 3D approaches but without knee joint essential parts. Knee joint are formed by three bones (Femur, Tibia and Patella) and deformed bodies called menisci, that eliminate direct contact and reduce friction between bones. In this system we can find orthotropic and isotropic materials working together. The main objective of this research is to develop a three-dimensional solid finite element model of the knee joint to predict stresses in its individual components (Femur, Tibia, Menisci and Patella). This model is a geometric non-linear contact path-dependent model that includes friction between bodies, which let us understand its structural mechanical behavior, seeing to suggest (propose) -with advanced research in the future- new knee joint prosthesis, as well as to prove the prosthesis-joint interaction before be implanted in the patient. This paper explains a complete human knee joint model without cartilaginous tissue, using ANSYS 7.0 Multiphysics, which show us multiple contact pairs working together (Non-linear analysis) and stress-strain analysis with a 1400 N applied force. The results obtained from the analysis serve to control contact pairs, convergence plots and its comparison with other models. In this way, we develop a first important step towards the structural characterization of Human Knee Joint.

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