The Dynamics of the Subtalar Joint in Sudden Inversion of the Foot

[+] Author and Article Information
Joseph Mizrahi, Yair Ramot

Department of Biomedical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel

Zev Susak

Loewenstein Rehabilitation Hospital, Raanana 43100, Israel

J Biomech Eng 112(1), 9-14 (Feb 01, 1990) (6 pages) doi:10.1115/1.2891133 History: Received December 06, 1988; Revised September 18, 1989; Online March 17, 2008


The human subtalar joint was modelled as a quasi-linear second-order underdamped system to simulate sudden inversion motion of the foot relative to the shank. The model was fed with experimental data obtained from six subjects on a specially constructed apparatus. A total of 35 deg inversion was produced on the tested leg rapidly enough (lasting less than 40 ms) in order to ensure that the protective muscles are not activated. The parameters of the joint were evaluated and the following ranges were obtained at 35 deg inversion: elastic stiffness 14–52 Nm rad-1 , damping coefficient 1.4–2.9 Nms rad-1 , and natural frequency 78–125 Hz. The effects on the test parameters of weight bearing amount, foot dominance, and protective footwear were studied on one subject.

Copyright © 1990 by The American Society of Mechanical Engineers
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