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  • 1.
    Rusaw, David
    et al.
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation. Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
    Hagberg, Kerstin
    University of Gothenburg.
    Nolan, Lee
    Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics. Jönköping University, School of Health and Welfare, HHJ. ADULT.
    Ramstrand, Nerrolyn
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation. Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics. Karolinska Institutet and GIH, Stockholm.
    Bilateral electromyogram response latency following platform perturbation in unilateral transtibial prosthesis users: Influence of weight distribution and limb position2013In: Journal of rehabilitation research and development, ISSN 0748-7711, E-ISSN 1938-1352, Vol. 50, no 4, p. 531-544Article in journal (Refereed)
    Abstract [en]

    Appropriate muscular response following an external perturbation is essential inpreventing falls. Transtibial prosthesis users lack a foot-ankle complex and associatedsensorimotor structures on the side with a prosthesis. Its effect on rapid responses ofthe lower-extremity to external surface perturbations is unknown. The aim of thepresent study was to compare electromyographic (EMG) response latencies of otherwisehealthy unilateral transtibial prosthesis users (n=23, mean age 48 years [standarddeviation 14]) and a matched control group (n=23, mean age 48 years [standard deviation13]) following sudden support surface rotations in the pitch plane (toes-up and toesdown).Perturbations were elicited in various weight-bearing and limb-perturbedconditions. The results indicated that transtibial prosthesis users have delayed responsesof multiple muscles of the lower-extremity following perturbation, both in the intact limband the residual limb. Weight-bearing had no influence on the response latency in theresidual limb, but did on the intact limb. Which limb received the perturbation wasfound to influence the muscular response, with the intact limb showing a significantlydelayed 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 thatuse a transtibial prosthesis.

  • 2.
    Rusaw, David
    et al.
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation. Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
    Hagberg, Kerstin
    Institute for Clinical Sciences, Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
    Nolan, Lee
    Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
    Ramstrand, Nerrolyn
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation. Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
    Can vibratory feedback be used to improve postural stability in persons with transtibial limb loss?2012In: Journal of rehabilitation research and development, ISSN 0748-7711, E-ISSN 1938-1352, Vol. 49, no 8, p. 1239-1254Article in journal (Refereed)
    Abstract [en]

    The use of vibration as a feedback modality to convey motion of the body has been shown to improve measures of postural stability in some groups of patients. Because individuals using transtibial prostheses lack sensation distal to the amputation, vibratory feedback could possibly be used to improve their postural stability. The current investigation provided transtibial prosthesis users (n = 24, mean age 48 yr) with vibratory feedback proportional to the signal received from force transducers located under the prosthetic foot. Postural stability was evaluated by measuring center of pressure (CoP) movement, limits of stability, and rhythmic weight shift while participants stood on a force platform capable of rotations in the pitch plane (toes up/toes down). The results showed that the vibratory feedback increased the mediolateral displacement amplitude of CoP in standing balance and reduced the response time to rapid voluntary movements of the center of gravity. The results suggest that the use of vibratory feedback in an experimental setting leads to improvements in fast open-loop mechanisms of postural control in transtibial prosthesis users.

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