Net external energy of the biologic and prosthetic ankle during gait initiation

Hansen, Alvin H.; Miff, Steve C.; Childress, Dudley S.; Gard, Steven A.; Meier, Margrit R.

doi:10.1016/j.gaitpost.2009.08.237

Cited by 17 publications

(21 citation statements)

References 12 publications

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“…Many studies have been done on the biological human ankle and prosthesis replaced with this limb [2,4,6,7,9,10,14]. By plotting ankle angles versus ankle moment and analyzing them in healthy males, Frigo et al (1996) found that with an increase in walking velocity some of the loops narrowed and then changed from clockwise to counterclockwise.…”

Section: Introductionmentioning

confidence: 99%

“…However, to mimic the characteristics of the human ankle during walking at fast speeds, an augmented system would be essential [6]. Accordingly, Hansen et al (2010) in the other study, examined the net external energy of the biologic human ankle joint and of some lower limb prosthetic ankle-foot systems during gait initiation. The purpose of this study was to better understand the ankle's behavior during the acceleration phase of walking for using in the design of improved lower limb prostheses and orthoses.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this study was to better understand the ankle's behavior during the acceleration phase of walking for using in the design of improved lower limb prostheses and orthoses. They evaluated the net external energy at the ankle from some able-bodied subjects and some persons with unilateral transtibial amputations during gait initiation [7].…”

Section: Introductionmentioning

confidence: 99%

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Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Soltani¹,

Esteki

2015

ACM

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Many studies have been done on the biological human ankle and prosthesis replaced with this limb. Although some of these works targeted to design a prosthesis which mimics the behavior of biological ankle, additional system is required to support the elastic components; any of them have obviously introduced an active system in designing ankle prosthesis until now. In this study the power of the non-disabled human ankle joint was examined during the stance phase of walking in sagittal plane. The study aimed to better understand the ankle's dynamic behavior for designing foot prosthesis with active mechanism. Kinematic and Kinetic data of the lower limb were collected from 18 healthy, young subjects (i.e. 6 females and 13 males) walking over a speed range of slow, normal and fast (i.e. 0.86 to 1.80 m/s). The ankle moment versus angle curves were plotted and total, mean and maximum values of powers were calculated for each trial. The results indicated that the total, mean and maximum values of the power could increase as the walking speed increased. The main findings of this study were the total, mean and maximum values of the power as a function of the linear velocity of walking. These results showed that the speed of 1.06 m/s was a critical velocity, below which the system was negative, showing energy consumer system, and above it the system was positive, suggesting generated energy. With the intent to design a prosthesis mimicking a biologic foot, an augmented system which is able to adjust the power to the speed is necessary.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Soltani¹,

Esteki

2015

ACM

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“…Previous trials studying the added value of a microprocessor-controlled prosthetic knee in level walking also showed that participants did not use knee yielding function. 12,152 We did find differences between the leading prosthetic condition on one side and the leading intact leg condition and controls on the other side. During the APA phase, the decoupling of the CoM and CoP of both the leading prosthetic and trailing intact leg are reduced when compared to controls.…”

Section: Discussionmentioning

confidence: 66%

“…First of all, the majority of prosthetic ankles lack active ankle function, which is needed for the posterior translation of the centre of pressure (CoP). 146,152 This impairs the mechanism by which propulsive forces are usually generated during gait initiation: through a posterior shift of the CoP the centre of mass (CoM) starts moving forwards due to the force of gravity. 153 In addition, ear- Because microprocessor-controlled adaptive prosthetic knees should increase stance stability and allow early stance flexion, they could be of added value during gait initiation.…”

Section: Introductionmentioning

confidence: 99%

Adapting to change : influence if a microprocessor-controlled prosthetic knee on gait adaptations

Prinsen¹

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Intention detection of gait initiation using EMG and kinematic data

et al. 2013

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Gait initiation in transfemoral amputees (TFA) is different from non-amputees. This is mainly caused by the lack of stability and push-off from the prosthetic leg. Adding control and artificial push-off to the prosthesis may therefore be beneficial to TFA. In this study the feasibility of real-time intention detection of gait initiation was determined by mimicking the TFA situation in non-amputees. EMG and inertial sensor data was measured in 10 non-amputees. Only data available in TFA was used to determine if gait initiation can be predicted in time to control a transfemoral prosthesis to generate push-off and stability. Toe-off and heel-strike of the leading limb are important parameters to be detected, to control a prosthesis and to time push-off. The results show that toe-off and heel-strike of the leading limb can be detected using EMG and kinematic data in non-amputees 130-260 ms in advance. This leaves enough time to control a prosthesis. Based on these results we hypothesize that similar results can be found in TFA, allowing for adequate control of a prosthesis during gait initiation.

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Net external energy of the biologic and prosthetic ankle during gait initiation

Cited by 17 publications

References 12 publications

Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Adapting to change : influence if a microprocessor-controlled prosthetic knee on gait adaptations

Intention detection of gait initiation using EMG and kinematic data

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