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BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI DYNAMIC ANALYSIS OF ANKLE JOINT – 3D BIOMECHANICS MODEL BY VICTOR COTOROS and EMIL BUDESCU ∗ Received July 20, 2012 Accepted for publication: November 10, 2012 “Gheorghe Asachi” Technical University of Iaşi, Department of Mechanisms Theory and Robotics Abstract. The paper presents three-dimensional dynamic model of the ankle joint, considering the independent movements the dorsal-plantar flexion and the inversion-eversion. Internal forces which acting on the foot were reduced in the ankle joint center to a single force and a moment of force. Using inverse dynamic analysis were written equations of motion of the foot, for four different positions of contact between foot and ground, during walking. Equations can be used to determine the resultant force and moment of force of ankle joint, requiring values of anthropometric characteristics, force and moment of inertia and the contact force between the foot and the ground. Key words: biomechanics, ankle joint, 3D structural model, dynamics. 1. Introduction The goal of the paper is to present a 3D dynamic model of the ankle joint for determining the resultant force and moment acting on this articulation, in different stages of the contact between the foot and ground during the gait. The ankle joint in made by two big articulations, namely: an upper joint formed by the lower extremities of the shank bones (tibia and fibula) and the upper face of the talus (talocrural joint) and a lower joint formed by talus and calcaneus (talocalcanean joint) (Papilian, 1982). ∗ Corresponding author: e-mail: ebudescu2006@yahoo.com
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