Journal of Rehabilitation Research & Development (JRRD)

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Volume 48 Number 7, 2011
   Pages 839 — 850

Abstract —  Stance control knee mechanism for lower-limb support in hybrid neuroprosthesis

Curtis S. To, PhD;1* Rudi Kobetic, MS;1 Thomas C. Bulea, MS;2 Musa L. Audu, PhD;2 John R. Schnellenberger, MS;1 Gilles Pinault, MD;1 Ronald J. Triolo, PhD1-3

1Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH; Departments of 2Biomedical Engineering and 3Orthopaedics, Case Western Reserve University, Cleveland, OH

Abstract — A hydraulic stance control knee mechanism (SCKM) was developed to fully support the knee against flexion during stance and allow uninhibited motion during swing for individuals with paraplegia using functional neuromuscular stimulation (FNS) for gait assistance. The SCKM was optimized for maximum locking torque for body-weight support and minimum resistance when allowing for free knee motion. Ipsilateral and contralateral position and force feedback were used to control the SCKM. Through bench and nondisabled testing, the SCKM was shown to be capable of supporting up to 70 N-m, require no more than 13% of the torque achievable with FNS to facilitate free motion, and responsively and repeatedly unlock under an applied flexion knee torque of up to 49 N-m. Preliminary tests of the SCKM with an individual with paraplegia demonstrated that it could support the body and maintain knee extension during stance without the stimulation of the knee extensor muscles. This was achieved without adversely affecting gait, and knee stability was comparable to gait assisted by knee extensor stimulation during stance.

Key words: assistive technology, closed-loop control, exoskeleton, functional neuromuscular stimulation, gait, hybrid neuroprosthesis, hydraulics, orthosis, paraplegia, rehabilitation engineering, spinal cord injury.

View HTML  ¦  View PDF  ¦  Contents Vol. 48, No. 7
This article and any supplementary material should be cited as follows:
To CS, Kobetic R, Bulea TC, Audu ML, Schnellenberger JR, Pinault G , Triolo RJ. Stance control knee mechanism for lower-limb support in hybrid neuroprosthesis. J Rehabil Res Dev. 2011;48(7):839-50.
ResearcherID: Curtis S. To, PhD: C-8101-2011.

Last Reviewed or Updated  Thursday, August 18, 2011 12:45 PM

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