Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 4, 2013
   Pages 531 — 544

Abstract — Bilateral electromyogram response latency following platform perturbation in unilateral transtibial prosthesis users: Influence of weight distribution and limb position

David Rusaw, PhD;1–2* Kerstin Hagberg, PhD;1 Lee Nolan, PhD;2–3 Nerrolyn Ramstrand, PhD2

1Institute for Clinical Sciences, Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; 2Department of Rehabilitation, School of Health Sciences, J??nk??ping University, J??nk??ping, Sweden; 3Laboratory for Biomechanics and Motor Control, Department of Neuroscience, Karolinska Institutet and GIH, ??Stockholm, Sweden

Abstract — Appropriate muscular response following an external perturbation is essential in preventing falls. Transtibial prosthesis users lack a foot-ankle complex and associated sensorimotor structures on the side with the prosthesis. The effect of this lack on rapid responses of the lower limb to external surface perturbations is unknown. The aim of the present study was to compare electromyogram (EMG) response latencies of otherwise healthy, unilateral, transtibial prosthesis users (n = 23, mean +/– standard deviation [SD] age = 48 +/– 14 yr) and a matched control group (n = 23, mean +/– SD age = 48 +/– 13 yr) following sudden support-surface rotations in the pitch plane (toes-up and toes-down). Perturbations were elicited in various weight-bearing and limb-perturbed conditions. The results indicated that transtibial prosthesis users have delayed responses of multiple muscles of the lower limb following perturbation, both in the intact and residual limbs. Weight-bearing had no influence on the response latency in the residual limb, but did on the intact limb. Which limb received the perturbation was found to influence the muscular response, with the intact limb showing a significantly delayed response when the perturbation was received only on the side with a prosthesis. These delayed responses may represent an increased risk of falling for individuals who use transtibial prostheses.

Key words: amputation, balance, electromyography, EMG, falling, lower limb, perturbation, prosthesis, postural response, transtibial.


View HTML  ¦  View PDF  ¦  Contents Vol. 50, No. 4
This article and any supplemental material should be cited as follows:
Rusaw D, Hagberg K, Nolan L, Ramstrand N. Bilateral electromyogram response latency following platform perturbation in unilateral transtibial prosthesis users: Influence of weight distribution and limb position. J Rehabil Res Dev. 2013;50(4):531–44.
http://dx.doi.org/10.1682/JRRD.2012.01.0017
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