Biomechanical features of level walking by transtibial amputees wearing prosthetic feet with and without adaptive ankles

Ko, Chang-Yong; Kim, Solbi; Kim, Jong Kwon; Chang, Yun Hee; Cho, Hyunseok; Kim, Shin-Ki; Ryu, Jeicheong; Mun, Mingyon

doi:10.1007/s12206-016-0550-6

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…These ankles adjust their resistance (damping) during certain portions of the gait cycle with the goal of adapting to different terrain. But, the hydraulic resistance can have adverse effects because adjusting resistance also affects the amount of power dissipated through ankle motion [18], [19]. The Össur Proprio Foot [20] uses another strategy, actively adapting ankle angle using robotic control.…”

Section: Introductionmentioning

confidence: 99%

Design and Validation of a Semi-Active Variable Stiffness Foot Prosthesis

Glanzer

Adamczyk

2018

IEEE Trans. Neural Syst. Rehabil. Eng.

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This paper presents the design and validation of a novel lower-limb prosthesis called the Variable-Stiffness Foot (VSF), designed to vary its forefoot stiffness in response to user activity. The VSF is designed as a semi-active device that adjusts its stiffness once per stride during swing phases, in order to minimize size, mass and power consumption. The forefoot keel is designed as an overhung composite beam, whose stiffness is varied by moving a support fulcrum to change the length of the overhang. Stiffness modulation is programmed in response to gait characteristics detected through foot trajectory reconstruction based on an embedded inertial sensor. The prototype VSF has mass of only 649 g including the battery, and build height of 87 mm. Mechanical testing demonstrated a forefoot stiffness range of 10–32 N/mm for the prototype, a threefold range of stiffness variation. The stiffness range can be altered by changing the keel material or geometry. Actuation testing showed that the VSF can make a full-scale stiffness adjustment within three strides, and tracks moderate speed-driven variations within one swing phase. Human subjects testing demonstrated greater energy storage and return with lower stiffness settings. This capability may be useful for modulating prosthesis energy return to better mimic human ankle function. Subjective feedback indicated clear perception by subjects of contrasts among the stiffness settings, including interpretation of scenarios for which different settings may be beneficial. Future applications of the VSF include adapting stiffness to optimize stairs, ramps, turns, and standing.

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Section: Introductionmentioning

confidence: 99%

Design and Validation of a Semi-Active Variable Stiffness Foot Prosthesis

Glanzer

Adamczyk

2018

IEEE Trans. Neural Syst. Rehabil. Eng.

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“…ESAR and PFAA hydraulic prostheses have been studied and compared when used by the UTTA population while people walked on level ground [5], [7]- [10]. However, very few studies have investigated the effect of prostheses on other than level ground surfaces.…”

Section: Introductionmentioning

confidence: 99%

Spatio temporal parameters and symmetry in subjects ascending and descending a ramp, using three different prosthetic feet

et al. 2020

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This study aimed at evaluating spatiotemporal parameters (STP) and symmetry index (SI), commonly used for evaluating amputee gait for routine clinical use, in individuals with unilateral transtibial amputations wearing energy storage and return (ESAR) feet with fixed ankles, prosthetic feet with adaptive ankles (PFAA) and prosthetic feet with microcontrolled adaptive ankles (PFAA-MC) in ramp ascent and descent. Thirteen individuals with transtibial amputations walked up and down a ramp. The STPs were measured in the amputated and intact legs and the relationship between them was quantified using the SI. The results showed that the use of PFAA-MC decreases walking speed in ramp descent (P ≤ 0.018). However, this was the only parameter that showed a significant change. Hence, the differences in the amputees' gait pattern when using the above-mentioned prostheses may not be reflected by STP and their SI.

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Passive Prosthetic Ankle and Foot with Glass Fiber Reinforced Plastic: Biomechanical Design, Simulation, and Optimization

Dao

Chau

2019

Biomaterials in Orthopaedics and Bone Regeneration

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Biomechanical features of level walking by transtibial amputees wearing prosthetic feet with and without adaptive ankles

Cited by 13 publications

References 22 publications

Design and Validation of a Semi-Active Variable Stiffness Foot Prosthesis

Design and Validation of a Semi-Active Variable Stiffness Foot Prosthesis

Spatio temporal parameters and symmetry in subjects ascending and descending a ramp, using three different prosthetic feet

Passive Prosthetic Ankle and Foot with Glass Fiber Reinforced Plastic: Biomechanical Design, Simulation, and Optimization

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