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Fatigue Test of Low-Cost Flexible-Shank Monolimb Trans-Tibial Prosthesis

Lee, Winson C.C. & Zhang, Ming (2006) Fatigue Test of Low-Cost Flexible-Shank Monolimb Trans-Tibial Prosthesis. Prosthetics and Orthotics International, 30(3), pp. 305-315.

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Abstract

Monolimb refers to a kind of trans-tibial prostheses with the socket and shank moulded into one piece of thermoplastic material. If properly designed, the shank of a monolimb can deflect which may compensate for the lost ankle plantarflexion and dorsiflexion to some extent. However, provision of shank flexibility is usually accompanied by reduced structural strength of the entire prosthesis. In our recent work using finite element analysis and the Taguchi method, the dimensions of the shank for the monolimb were derived which aimed at giving high shank flexibility and reasonable strength to resist static load. Yet, fatigue testing has not been performed. Fatigue failure may happen when a relatively low level of load is applied repeatedly. This study aimed to document the fatigue life of two flexible-shank monolimbs, by applying cyclic force of 800N at the forefoot region for 500,000 cycles. Results showed that the design of the foot bolt adaptor played an important role in the structural integrity of the monolimb. One monolimb completed the fatigue test of 500,000 cycles without visual material yield, but with 3.8 degrees change in dorsiflexion angle when the load was removed.

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3 citations in Scopus
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5 citations in Web of Science®

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ID Code: 3653
Item Type: Journal Article
Additional Information: The author-version of this article will be available 12-18 months after publication. For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: wc.lee@qut.edu.au
Keywords: adaptor design, fatigue test, monolimb, shank flexibility, trans, tibial prosthesis
DOI: 10.1080/03093640600864172
ISSN: 1746-1553
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Rehabilitation Engineering (090305)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 Taylor & Francis
Copyright Statement: First published in Prosthetics and Orthotics International 30(3):pp. 305-315.
Deposited On: 07 Mar 2006
Last Modified: 11 Aug 2011 04:37

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