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Type: Journal article
Title: Dynamics of A2 finger pulley rupture
Author: Tan, M.
Fuss, F.
Niegl, G.
Citation: Journal of Mechanics in Medicine and Biology, 2007; 7(1):75-87
Publisher: World Scientific Publishing Co. Pte. Ltd.
Issue Date: 2007
ISSN: 0219-5194
Statement of
Ming A. Tan, Franz K. Fuss and Günther Niegl
Abstract: A mathematical model of the A2 pulley system will enable us to have a better understanding of the mechanics of the pulley-tendon system and provide us with insights of the pulley rupture mechanism. The A2 pulley was modeled based on parallel pulley fibers attached to a phalanx with a tendon passing them. Mechanical properties of the pulleys such as stiffness, strength and friction were included in the model. A convergence test was done to ensure the accuracy of the test. The model managed to show high loads on flexed finger may lead to pulley ruptures. Further studies on the rupture mechanism showed that pulley ruptures are self-propagating when a constant force is applied and the rate of rupture increases, as fewer intact fibers are present to support the load. The initial rate of propagation is much slower and this accelerates as more fibers are ruptured. This explains the common occurrence of partial pulley ruptures.
Keywords: A2 pulley; finger modelling; rupture mechanism; self-propagation
Description: Copyright © 2007 World Scientific Publishing Co.
RMID: 0020094388
DOI: 10.1142/S0219519407002157
Appears in Collections:Mechanical Engineering publications

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