Design and Development of an Unconstrained Dynamic Knee Simulator

[+] Author and Article Information
C. A. McLean, A. M. Ahmed

Department of Mechanical Engineering, McGill University, Montreal, Canada

J Biomech Eng 115(2), 144-148 (May 01, 1993) (5 pages) doi:10.1115/1.2894114 History: Received April 15, 1991; Revised July 30, 1992; Online March 17, 2008


A dynamic knee simulator has been developed to allow in-vitro investigation of the mechanical response of the joint corresponding to dynamic functional activities, e.g., walking. In the simulator, the controlled inputs are the time-histories of three parameters of a given dynamic activity: the flexion angle, and the flexion/extension moment and tibial axial force components of the foot-to-floor reaction. A combination of stepping motors and electro-hydraulic actuators is used to apply to a knee specimen, simultaneously and independently, the specified load and/or displacement inputs while allowing unconstrained relative motion between the joint members. Satisfactory performance of the simulator has been established for walking gait conditions based on measurements on three fresh-frozen specimens.

Copyright © 1993 by The American Society of Mechanical Engineers
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