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Licensed Unlicensed Requires Authentication Published by De Gruyter February 19, 2015

Quantitative biomechanical comparison of ankle fracture casting methods

  • Alastair Shipman , Joseph Alsousou , David J. Keene , Igor N. Dyson , Sarah E. Lamb , Keith M. Willett and Mark S. Thompson EMAIL logo


The incidence of ankle fractures is increasing rapidly due to the ageing demographic. In older patients with compromised distal circulation, conservative treatment of fractures may be indicated. High rates of malunion and complications due to skin fragility motivate the design of novel casting systems, but biomechanical stability requirements are poorly defined. This article presents the first quantitative study of ankle cast stability and hypothesises that a newly proposed close contact cast (CCC) system provides similar biomechanical stability to standard casts (SC). Two adult mannequin legs transected at the malleoli, one incorporating an inflatable model of tissue swelling, were stabilised with casts applied by an experienced surgeon. They were cyclically loaded in torsion, measuring applied rotation angle and resulting torque. CCC stiffness was equal to or greater than that of SC in two measures of ankle cast resistance to torsion. The effect of swelling reduction at the ankle site was significantly greater on CCC than on SC. The data support the hypothesis that CCC provides similar biomechanical stability to SC and therefore also the clinical use of CCC. They suggest that more frequent re-application of CCC is likely required to maintain stability following resolution of swelling at the injury site.

Corresponding author: Mark S. Thompson, Botnar Research Centre, Nuffield Orthopaedic Centre, Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Windmill Road, Oxford OX3 7LD, UK, Phone: +44 (0)1865 737845, Fax: +44 (0)1865 737, E-mail:


The authors gratefully acknowledge the support of the NIHR Oxford Biomedical Research Centre, Joint Action and the NIHR Oxford Musculoskeletal Biomedical Research Unit. These funders had no involvement in any aspect of the study.


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Received: 2014-7-16
Accepted: 2015-1-20
Published Online: 2015-2-19
Published in Print: 2015-6-1

©2015 by De Gruyter

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