Identification of passive knee joint and shank dynamics in paraplegics using quadriceps stimulation
- 1 January 1993
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Rehabilitation Engineering
- Vol. 1 (3) , 154-164
- https://doi.org/10.1109/86.279264
Abstract
The dynamics of the knee-joint-freely-swinging-lower-leg system of three sitting paraplegic patients was identified using a parameterized analytical model. Surface electrodes were used for stimulation. The output of the knee joint-lower leg system was the angular position, velocity and acceleration. A model structure was taken from the literature and its complexity minimized based on the experiments and offline identification. The resulting model structure facilitates possible recursive identification. Model parameters of the lower leg dynamics were estimated using a least-squares algorithm in combination with the Levenburg-Marquardt algorithm. The intersubject variability in parameter values for the knee joint damping and the gravitational component appeared to be small when normalized to the inertia of the lower leg. The identified model for the knee joint and shank dynamics accurately predicted passive lower leg movement and could be used to estimate the magnitude of active knee torque due to elicited quadriceps contractioKeywords
This publication has 30 references indexed in Scilit:
- Muscle input-output model: the static dependence of force on length, recruitment, and firing periodIEEE Transactions on Biomedical Engineering, 1992
- Nonlinear Dynamic Behavior of the Human Knee Joint—Part I: Postmortem Frequency Domain AnalysesJournal of Biomechanical Engineering, 1991
- The development of a model reference adaptive controller to control the knee joint of paraplegicsIEEE Transactions on Automatic Control, 1991
- Feedback control methods for task regulation by electrical stimulation of musclesIEEE Transactions on Biomedical Engineering, 1991
- Restoring unassisted natural gait to paraplegics via functional neuromuscular stimulation: a computer simulation studyIEEE Transactions on Biomedical Engineering, 1990
- Methods for estimating isometric recruitment curves of electrically stimulated muscleIEEE Transactions on Biomedical Engineering, 1989
- Open-loop control of the freely-swinging paralyzed legIEEE Transactions on Biomedical Engineering, 1989
- A dynamic optimization technique for predicting muscle forces in the swing phase of gaitJournal of Biomechanics, 1987
- The passive elastic moment at the knee and its influence on human gaitJournal of Biomechanics, 1986
- An analytical model of the kneeJournal of Biomechanics, 1976