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A New Method for the Identification of Joint Mechanical Properties  

엄광문 (건국대학교 의과대학 의학공학부)
김석주 (건국대학교 의과대학 재활의학과)
한태륜 (서울대학교 의과대학 재활의학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.11, 2004 , pp. 209-218 More about this Journal
Abstract
The purpose of this paper is to suggest a practical and simple method for the identification of the joint mechanical properties and to apply it to human knee joints. The passive moment at a joint was modeled by three mechanical parts, that is, a gravity term, a linear damper term and a nonlinear spring term. Passive pendulum tests were performed in 5 fat and 5 thin men. The data of pendulum test were used to identify the mechanical properties of joints through sequential quadratic programming (SQP) with random initial values. The identification was successful where the normalized root-mean-squared (RMS) errors between the simulated and experimental joint angle trajectories were less than 10％. The parameter values of mechanical properties obtained in this study agreed with literature. The inertia, gravity and the damping constant were greater at fat men, which indicates more resistance to body movement and more energy consumption fer fat men. The suggested method is noninvasive and requires simple setup and short measurement time. It is expected to be useful in the evaluation of joint pathologies.
Keywords
identification; passive pendulum; noninvasive; joint pathologies; joint mechanical properties;
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