Evaluation of a Powered Ankle-Foot Prosthetic System During Walking

Ferris, Abbie E.; Aldridge, Jennifer M.; Rábago, Christopher A.; Wilken, Jason M.

doi:10.1016/j.apmr.2012.06.009

Cited by 108 publications

(120 citation statements)

References 29 publications

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“…Joint kinematics at instance of minimum toe clearance, in degrees, presented as average ± standard deviation for level-only condition at selfselected velocity and as estimated marginal means ± standard error across both level and incline condition (at self-selected velocity). In general, the evidence supporting the use of microprocessor-controlled prosthetic feet for improving balance, function, and/or mobility of people with amputation is limited and has only recently begun to appear in the literature (e.g., references [25][26][27][28][29][30]). At present, there are few English-written studies of the ProprioFoot, and those that exist have focused on socket pressures [31], hip and knee kinematics and kinetics [32][33], gait economy [34][35], and related aspects of gait [36][37] but not on MTC.…”

Section: Discussionmentioning

confidence: 99%

Active dorsiflexing prostheses may reduce trip-related fall risk in people with transtibial amputation

et al. 2014

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Abstract-People with amputation are at increased risk of falling compared with age-matched, nondisabled individuals. This may partly reflect amputation-related changes to minimum toe clearance (MTC) that could increase the incidence of trips and fall risk. This study determined the contribution of an active dorsiflexing prosthesis to MTC. We hypothesized that regardless of speed or incline the active dorsiflexion qualities of the ProprioFoot would significantly increase MTC and decrease the likelihood of tripping. Eight people with transtibial amputation walked on a treadmill with their current foot at two grades and three velocities, then repeated the protocol after 4 wk of accommodation with the ProprioFoot. A mixed-model, repeated-measures analysis of variance was used to compare MTC. Curves representing the likelihood of tripping were derived from the MTC distributions and a multiple regression was used to determine the relative contributions of hip, knee, and ankle angles to MTC. Regardless of condition, MTC was approximately 70% larger with the ProprioFoot (p < 0.001) and the likelihood of tripping was reduced. Regression analysis revealed that MTC with the ProprioFoot was sensitive to all three angles, with sensitivity of hip and ankle being greater. Overall, the ProprioFoot may increase user safety by decreasing the likelihood of tripping and thus the pursuant likelihood of a fall.

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Section: Discussionmentioning

confidence: 99%

Active dorsiflexing prostheses may reduce trip-related fall risk in people with transtibial amputation

et al. 2014

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“…There are several examples in which servicemembers who participated in intensive rehabilitation programs and had access to regular prosthetic care demonstrated smaller deficits than previously reported. For example, they have performed similarly to their nondisabled counterparts in areas such as activity performance, gait biomechanics, and walking stability [34][35][36][37][38][39][40][41]. It is important to recognize that the similarities observed here and elsewhere, while encouraging, do not represent an absence of dysfunction or the full restoration of function in all people or across all aspects of life.…”

Section: Russell Esposito Et Al Metabolic Demand Of Walking In Amputeesmentioning

confidence: 99%

Does unilateral transtibial amputation lead to greater metabolic demand during walking?

et al. 2014

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Abstract-Previous literature reports greater metabolic demand of walking following transtibial amputation. However, most research focuses on relatively older, less active, and often dysvascular amputees. Servicemembers with traumatic amputation are typically young, fit, and highly active before and often following surgical amputation of their lower limb. This study compared the metabolic demand of walking in young, active individuals with traumatic unilateral transtibial amputation (TTA) and nondisabled controls. Heart rate (HR), rate of oxygen consumption, and rating of perceived exertion (RPE) were calculated as subjects walked at a self-selected velocity and at five standardized velocities based on leg length. The TTA group completed a Prosthetics Evaluation Questionnaire. Oxygen consumption (p = 0.89), net oxygen consumption (p = 0.32), and RPE (p = 0.14) did not differ between groups. Compared with controls, HR was greater in the TTA group and increased to a greater extent with velocity (p < 0.001). Overall, the TTA group rated their walking abilities as high (mean: 93% out of 100%). This is the first study to report equivalent metabolic demand between persons with amputation and controls walking at the same velocity. These results may reflect the physical fitness of the young servicemembers with traumatic amputations and may serve to guide outcome expectations in the future.

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“…Previous reports of joint kinetics during the swing phase of walking have shown small differences (~20%) between the intact and amputated limbs (Ferris et al, 2012;Powers et al, 1998). This study has shown that when the inertial properties of the limb are adjusted using the GENERAL model, the differences between the INTACT and GENERAL methods is nearly 50% during swing phase.…”

Section: Discussionmentioning

confidence: 60%

A general model for estimating lower extremity inertial properties of individuals with transtibial amputation

Ferris

Smith

Heise

et al. 2017

Journal of Biomechanics

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Evaluation of a Powered Ankle-Foot Prosthetic System During Walking

Cited by 108 publications

References 29 publications

Active dorsiflexing prostheses may reduce trip-related fall risk in people with transtibial amputation

Active dorsiflexing prostheses may reduce trip-related fall risk in people with transtibial amputation

Does unilateral transtibial amputation lead to greater metabolic demand during walking?

A general model for estimating lower extremity inertial properties of individuals with transtibial amputation

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