Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 5, 2013
   Pages 687 — 698

Abstract — Motor control and learning with lower-limb myoelectric control in amputees

Ramses E. Alcaide-Aguirre, BS;1* David C. Morgenroth, MD;2 Daniel P. Ferris, PhD1

1Human Neuromechanics Laboratory and School of Kinesiology, University of Michigan, Ann Arbor, MI; 2Rehabilitation Research and Development Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA; and Department of Rehabilitation Medicine, University of Washington, Seattle, WA

Abstract — Advances in robotic technology have recently enabled the development of powered lower-limb prosthetic limbs. A major hurdle in developing commercially successful powered prostheses is the control interface. Myoelectric signals are one way for prosthetic users to provide feedforward volitional control of prosthesis mechanics. The goal of this study was to assess motor learning in people with lower-limb amputation using proportional myoelectric control from residual-limb muscles. We examined individuals with transtibial amputation and nondisabled controls performing tracking tasks of a virtual object. We assessed how quickly the individuals with amputation improved their performance and whether years since amputation correlated with performance. At the beginning of training, subjects with amputation performed much worse than control subjects. By the end of a short training period, tracking error did not significantly differ between subjects with amputation and nondisabled subjects. Initial but not final performance correlated significantly with time since amputation. This study demonstrates that although subjects with amputation may initially have poor volitional control of their residual lower-limb muscles, training can substantially improve their volitional control. These findings are encouraging for the future use of proportional myoelectric control of powered lower-limb prostheses.

Key words: amputation, electromyography, motor learning, myoelectric, prosthetic, rehabilitation, residual limb, tracking task, transtibial, volitional control.

View HTML  ¦  View PDF  ¦  Contents Vol. 50, No. 5
This article and any supplementary materials should be cited as follows:
Alcaide-Aguirre RE, Morgenroth DC, Ferris DP. Motor control and learning with lower-limb myoelectric control in amputees. J Rehabil Res Dev. 2013;50(5):687–98.

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Last Reviewed or Updated  Friday, August 16, 2013 10:52 AM

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