Dynamic characterisation of Össur Flex-Run prosthetic feet for a more informed prescription

Noroozi, Siamak; Ong, Zhi Chao; Khoo, Shin Yee; Aslani, Navid; Sewell, Philip

doi:10.1177/0309364618789449

Cited by 10 publications

(10 citation statements)

References 24 publications

(31 reference statements)

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“…Mechanical tests showed that the system was durable enough to withstand maximum tibial acceleration (2 g) when walking over enough cycles to meet ISO 22657 requirements [53,54]. It was also tested for natural resonance frequencies based on ISO 7626-5:2019 while keeping in mind the natural frequencies of running and walking [55,[57][58][59]. The system did not have any resonance frequencies between 0.1 and 10 Hz which includes low frequency walking as well as running frequencies which average around 4.1 Hz [55].…”

Section: Discussionmentioning

confidence: 99%

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

et al. 2022

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Objective. Lower limb amputees suffer from a variety of functional deficits related to the absence of sensory communication between the central nervous system and the lost extremity. Indeed, they experience high risk of falls, asymmetric walking and balance, and low prosthesis embodiment, that significantly decrease their quality of life. Presently, there are no commercially available devices able to provide sensory feedback to leg amputees. Recently, some invasive solutions (i.e. requiring a surgery) have been proposed by different research groups, however a non-invasive effective alternative exploitable in everyday life is still missing. Approach. To address this need we developed and tested a lightweight, non-invasive, wearable technology (NeuroLegs) providing sensory (i.e. knee angle joint and tactile) feedback to the users through electro-cutaneous stimulation. A user-friendly GUI and mobile App have been developed to easily calibrate and control the system. Standard mechanical and electrical tests were performed to assess the safety and reliability of the technology. Main results. No mechanical failures, stable communication among system parts and a long-lasting battery (>23h) were demonstrated. The NeuroLegs system was then verified in terms of accuracy in measuring relevant gait parameters in healthy participants. A high temporal reliability was found when detecting stride features (important for the real-time configuration) with a correct match to the walking cadence, in all assessed walking conditions. The effectiveness of the NeuroLegs system at improving walking of three transfemoral amputees was then verified in movement laboratory tests. Increased temporal gait symmetry and augmented confidence were found. Stepping outside from the lab, Neurolegs was successfully exploited by a transfemoral amputee in CYBATHLON Global Edition 2020 in several challenging situations related to daily-living activities. Significance. Our results demonstrate that the NeuroLegs system provides the user with useful sensory information that can be successfully exploited in different walking conditions of daily life.

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Section: Discussionmentioning

confidence: 99%

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

et al. 2022

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“…Many studies involve modelling the behaviour of the blade to better represent the experimental results. They use parametric modelling 13,14 , finite element modelling 15 , or biomechanical models 16 . The simplest modelling for RSPs is the same as the one used for modelling the leg during the running or walking stance phase: namely the spring-mass model 17,18 .…”

Section: Figure 1 (A)mentioning

confidence: 99%

Mechanical interaction between the ground and a tibial prosthesis: a new characterisation protocol

Doyen

Szmytka

Semblat

2022

Preprint

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The study of Running Specific Prostheses (RSPs) is often limited to the blade. The setup developed and presented here is a simple experiment based on a testing machine and a camera that assesses two indicators relevant to coaches and athletes in the field of athletics: secant stiffness and energy dissipation. The influence of four parameters on global prosthesis behaviour was assessed: the load line adjustment, the prosthesis-ground angle, the sole type and the flooring type. The load line adjustment and the flooring type have little to no influence on their behaviour. The prosthesis-ground angle impacts the stiffness: an increase in angle brings a significant decrease in stiffness. The influence of the type of sole is harder to use for athletics since the practice of sport imposes the use of spikes. The camera images allow assessing the local behaviour of the sole, thus enabling to follow its strain through the compression process.

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“…Loads and frequencies change between running and ambulation, and therefore when categorized for running, such a foot would not be optimal for everyday ambulation. 7 PHYSICAL THERAPY EVALUATION Initial evaluation by a physical therapist specializing in running medicine revealed hip extension strength deficits bilaterally, with the involved right leg exhibiting 4-/5 strength and sound left limb with 4/5 strength. Hip abduction muscle strength was 4/5 bilaterally.…”

Section: Prosthesis Designmentioning

confidence: 99%

Strategies for Gait Retraining in a Collegiate Runner with Transfemoral Amputation: A Case Report

Santer

MacDonald

Rizzone

et al. 2021

International Journal of Sports Physical Therapy

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BackgroundMore than fifty percent of people with limb amputations participate in sports or physical activity following amputation. Athletes with limb amputations may face additional challenges including phantom limb pain (PLP), psychological barriers, prosthetic complications, and gait abnormalities. Prevalence of PLP in the general amputee population is estimated to be as high as 85%. Despite the high prevalence of PLP, there is little research regarding the use of gait training as a treatment for PLP among both the general amputee population and athletes. Case DescriptionA 20-year old female collegiate track and field athlete presented with phantom knee pain brought on with running. The athlete demonstrated deficits in core and hip strength as well as decreased single leg stability bilaterally. Running gait analysis revealed circumduction with the prosthesis for limb advancement and increased vaulting with push off on the sound (uninvolved) limb. Gait retraining strategies were implemented to address video analysis findings and create a more efficient running gait and address phantom limb pain symptoms. OutcomesRehabilitation and gait retraining strategies were effective in improving several clinical and functional outcomes in this case. Significant improvements were noted in PLP, running gait mechanics, and the patient's psychological and functional status as measured with a standardized outcome tool, the Patient-Reported Outcomes Measurement Information System ® (PROMIS ® ). DiscussionRunning gait training following amputation could be a crucial component of rehabilitation for athletes in an attempt to lessen pain while running, especially in those experiencing phantom limb pain (PLP). Utilization of a multidisciplinary team in the gait retraining process is recommended. There is a need for further research to determine the effects of running gait retraining for management of PLP in athletes with amputation.

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Dynamic characterisation of Össur Flex-Run prosthetic feet for a more informed prescription

Cited by 10 publications

References 24 publications

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

Mechanical interaction between the ground and a tibial prosthesis: a new characterisation protocol

Strategies for Gait Retraining in a Collegiate Runner with Transfemoral Amputation: A Case Report

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