Trans-tibial amputee gait adaptations as a result of prosthetic inertial manipulation

Hillery, Siobhan C.; Wallace, Eric S.

doi:10.1080/096382800296647

Cited by 11 publications

(1 citation statement)

References 8 publications

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“…It is possible that preferred walking velocity might have been different among the load conditions. 33 As has been noted in the literature 34 walking speed influences many of the variables that were investigated in the current study. Thus, not controlling walking speed may influence the results of this study.…”

Section: Discussionmentioning

confidence: 68%

Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry

Smith

Martin²

2013

Journal of Applied Biomechanics

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Unilateral, transtibial amputees exhibit walking asymmetries and higher metabolic costs of walking than nonamputees walking at similar speeds. Using lightweight prostheses has previously been suggested as a contributing factor to walking asymmetries. The purpose was to investigate the effects of prosthesis mass and mass distribution on metabolic costs and walking asymmetries among six unilateral, transtibial amputees. Kinematic and temporal symmetry did not improve when mass was added at different locations on the limb. Stance and swing time asymmetries increased by 3.4% and 7.2%, respectively, with loads positioned distally on the limb. Maximum knee angular velocity asymmetries increased by 6% with mass added to the thigh, whereas maximum thigh angular velocity asymmetries increased by approximately 10% with mass positioned near the prosthetic ankle. Adding 100% of the estimated mass difference between intact and prosthetic legs to the ankle of the prosthesis increased energy costs of walking by 12%; adding the same mass to the prosthesis center of mass or thigh center of mass increased metabolic cost by approximately 7% and 5%, respectively. Unless other benefits are gained by increasing prosthesis mass, this should not be considered as a possible alternative to current lightweight prosthesis designs currently being prescribed to unilateral amputees.

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Section: Discussionmentioning

confidence: 68%

Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry

Smith

Martin²

2013

Journal of Applied Biomechanics

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Effect of speed on the energy cost of walking in unilateral traumatic lower limb amputees

Genin

Bastien

Franck³

et al. 2008

Eur J Appl Physiol

140

108

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In this work, the effect of walking speed on the energy expenditure in traumatic lower-limb amputees was studied. The oxygen consumption was measured in 10 transfemoral amputees, 9 transtibial amputees and 13 control subjects, while they stood and walked at different speeds from 0.3 m s(-1) to near their maximum sustainable speed. Standing energy expenditure rate was the same in lower-limb amputees and in control subjects (approximately 1.85 W kg(-1)). On the contrary, during walking, the net energy expenditure rate was 30-60% greater in transfemoral amputees and 0-15% greater in transtibial amputees than in control subjects. The maximal sustainable speed was about 1.2 m s(-1) in transfemoral amputees and 1.6 m s(-1) in transtibial amputees, whereas it was above 2 m s(-1) in control subjects. Among these three groups, the cost of transport versus speed presented a U-shaped curve; the minimum cost increased with the level of amputation, and the speed at which this minimum occurred decreased.

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