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Static and Dynamic Analysis of Osteoarthritic and Orthotic Human Knee

Journal of Bionic Engineering 2019年第3期16卷 514-525页

作者： daniela tarnita Doina Pisla Ionut Geonea Calin Vaida Marius Catana Danut Nicolae tarnita University of Craiova Faculty of Mechanics Calea Bucuresti no. 107 200512 Craiova Romania Technical University Cluj Napoca CESTER - Research Centre for the Robot Simulation and Testing Memorandumului str. no. 28400114 Cluj-Napoca Romania INAS Nicolae Romanescu Blvd 37C 200738 Craiova Romania University of Medicine and Pharmacy Craiova & Emergency Hospital Craiova Craiova Petru Rares str. no. 2 200349 Romania

The first objective of this paper is to study the influence of the orthotic device on the maximum values of stresses in knee cartilages by using Ansys Workbench 14.5 software and applying the Finite Element Analysis (FEA) on a virtual assembly composed by an orthotic device and osteoarthritic knee (OAK). The second objective consists into quantifying and investigating the nonlinear motion of the human knee joint for OAK patients, with and without the orthotic device mounted on OAK, using tools of dynamics stability analysis. The short Lyapunov Exponents (LEs) are calculated, as measures of human knee and ankle joints stability, based on the experimental time series collected by using the biometrics acquisition system during walking on horizontal and inclined treadmills from a sample of healthy subjects and a sample of patients suffering by OAK disease. The values of LEs obtained for OAK patients are larger on the inclined treadmill than on horizontal treadmill and are larger than those obtained for healthy knees, being associated with more divergence and less stability. The results confirm that the influence of an orthotic device mounted on OAK on its stability is significant, the values obtained for LEs being smaller than those calculated for OAK, and closer to the values of normal knees of patients and of healthy subjects.

关键词： osteoarthritic knee bioinspired orthosis finite element method gait stability Lyapunov exponents

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