Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 8, 2013
   Pages 1129 — 1138

Abstract — Biomechanical evaluation of wrist-driven flexor hinge orthosis in persons with spinal cord injury

Yeoun-Seung Kang, MD, PhD, CPO;1 Yoon-Ghil Park, MD, PhD;2 Bum-Suk Lee, MD;3 Hyung-Soon Park, PhD1,4*

1Department of Rehabilitation Medicine, Clinical Center, National Institutes of Health, Bethesda, MD; 2Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea; 3National Rehabilitation Hospital, Seoul, Korea; 4Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea

Abstract — The wrist-driven flexor hinge orthosis (WDFHO) is a device used to restore hand function in persons with tetraplegic spinal cord injury by furnishing three-point prehension. We assessed the effectiveness and biomechanical properties of the WDFHO in 24 persons with cervical 6 or 7 tetraplegia who have severely impaired hand function. This study introduces a mechanical operating model to assess the efficiency of the WDFHO. Experimental results showed that pinch force increased significantly (p < 0.001) after using the WDFHO and was found to positively correlate with the strength of wrist extensor muscles (r = 0.41, p < 0.001). However, when the strength of the wrist extensors acting on the WDFHO was greater, the reciprocal wrist and finger motion that generates three-point prehension was less effective (r = 0.79, p < 0.001). Reliable and valid biomechanical evaluation of the WDFHO could improve our understanding of its biomechanics.

Key words: biomechanics, efficiency, finger motion, hand function, mechanical operating model, pinch force, spinal cord injury, three-point prehension, wrist-driven flexor hinge orthosis, wrist extensor muscles.


View HTML  ¦  View PDF  ¦  Contents Vol. 50, No. 8
This article and any supplementary material should be cited as follows:
Kang YS, Park YG, Lee BS, Park HS. Biomechanical evaluation of wrist-driven flexor hinge orthosis in persons with spinal cord injury. J Rehabil Res Dev. 2013; 50(8):1129–38.
http://dx.doi.org/10.1682/JRRD.2012.10.0189
ResearcherID/ORCID: Hyung-Soon Park, PhD: B-3334-2010
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Last Reviewed or Updated  Wednesday, December 11, 2013 9:34 AM

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