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This study investigates EMG response latency in transtibial prosthesis users and control groups following support-surface perturbations in pitch plane. Findings reveal delayed muscular responses in prosthesis users, raising concerns about fall risk.
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Bilateral electromyogram response latency following platform perturbation in unilateral transtibial prosthesis users: Influence of weight distribution and limb position David Rusaw, PhD; Kerstin Hagberg, PhD; Lee Nolan, PhD; Nerrolyn Ramstrand, PhD
Aim • Compare electromyogram (EMG) response latencies of unilateral transtibial prosthesis users and control group following sudden support-surface rotations in pitch plane. • Relevance • Appropriate muscular response after external perturbation is essential in preventing falls. • Transtibial prosthesis users lack foot-ankle complex and associated sensorimotor structures, but how this affects lower-limb response to external surface perturbations is unknown.
Method • Perturbations were elicited in various weight-bearing and limb-perturbed conditions.
Results • Transtibial prosthesis users had delayed responses of multiple lower-limb muscles following perturbation. • Both in intact and residual limbs. • Weight-bearing did not influence response latency in residual limb, but did in intact limb. • Which limb received perturbation was found to influence muscular response. • Intact limb had significantly delayed response when perturbation was received only on prosthetic side.
Conclusion • Delayed EMG responses in transtibial prosthesis users may place them at increased risk of falling when subjected to external balance threat.
