Dynamic characterisation of Össur Flex-Run Prosthetic feet.

Noroozi, S., Ong, Z.C., Khoo, M., Aslani, N. and Sewell, P., 2017. Dynamic characterisation of Össur Flex-Run Prosthetic feet. Prosthetics and Orthotics International. (In Press)

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Background: The current method of prescribing composite Energy Storing and 6 Returning (ESR) feet is subjective and is based only on the amputee’s static body 7 weight/mass. 8 Objectives: The aim is to investigate their unique design features through identifying 9 and analysing their dynamic characteristics, utilising modal analysis, to determine 10 their mode shapes, natural damping and natural frequencies. Full understanding of 11 the dynamic characteristics can inform on how to tune a foot to match an amputee’s 12 gait and body condition. 13 Methods: This paper presents the modal analysis results of the full range of Össur 14 Flex-Run running feet that are commercially available (1LO-9LO). 15 Results: It is shown that both the undamped natural frequency and stiffness increase 16 linearly from the lowest to highest stiffness category of foot. The effect of over-load 17 and under-loading on natural frequencies is also presented. The damping factor for 18 each foot has been experimentally determined and it was found to be ranging 19 between 1.5-2.0%. An analysis of the mode shapes also showed a unique design 20 feature of these feet that is hypothesised to enhance their performance. 21 Conclusions: A better understanding of the feet dynamic characteristics can help to 22 tune the feet to the user’s requirements. 23 (194 words)

Item Type:Article
Uncontrolled Keywords:biomechanics of prosthetic/orthotic devices < biomechanics, Testing of ; damping, mode shape, natural frequency, prosthesis
Group:Faculty of Science & Technology
ID Code:29966
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:13 Nov 2017 14:39
Last Modified:13 Nov 2017 14:39


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