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This article is part of the supplement: 3rd Congress of the International Foot and Ankle Biomechanics Community

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Correlates of calf cramp in children with Charcot-Marie-Tooth disease

Fiona E Blyton12*, Monique M Ryan3, Robert A Ouvrier14 and Joshua Burns14

Author Affiliations

1 Discipline of Paediatrics and Child Health, The University of Sydney, Westmead, NSW, 2145, Australia

2 Podiatry Program, The University of Newcastle, Ourimbah, 2258, Australia

3 Neurosciences Department, Royal Children’s Hospital, Parkville, 3052, Victoria

4 Institute for Neuroscience and Muscle Research, The Children’s Hospital at Westmead, Sydney, NSW, 2145, Australia

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Journal of Foot and Ankle Research 2012, 5(Suppl 1):O16  doi:10.1186/1757-1146-5-S1-O16

The electronic version of this article is the complete one and can be found online at:

Published:10 April 2012

© 2012 Blyton et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Leg muscle cramps have been identified as the strongest independent predictor of worse quality of life in Australian children with Charcot-Marie-Tooth disease Type 1A (CMT1A) [1]. There is no accepted treatment for cramp in children with CMT and the cause of cramp is not well understood. Potential therapeutic targets should be carefully identified to direct clinical trials of interventions.

Materials and methods

81 children aged 2-16 years with CMT1A were recruited nationally through the Australasian Paediatric Charcot-Marie-Tooth Disease Registry [2]. Body size and measures of strength, ankle range, foot posture, balance, agility, endurance, gait and neurophysiology were assessed at The Children's Hospital at Westmead (Sydney) and Royal Children's Hospital (Melbourne). Data analysis included Pearson product moment and Spearman rank correlation coefficients for normally and non-normally distributed continuous data respectively, and Fischer's exact test for dichotomous data. Logistic regression analyses were performed to identify independent predictors of calf cramp.


Of the 81 children, 26 (32%) reported calf cramp and one child each reported toe, quadriceps or arm cramp. Calf cramp was associated (p < 0.05) with older age; presence of hand tremor; stronger foot inversion, eversion, dorsiflexion and plantarflexion; and better performance in long jump and 9-hole peg tests. Logistic regression analysis revealed only increasing age (OR 1.32; 95% CI: 1.11 to 1.58; p = 0.002) and presence of hand tremor (OR 3.81; 95% CI: 1.18 to 12.56; p = 0.028) as independent predictors of calf cramp.


Calf cramps are common in children with CMT1A and worsen with age. This study revealed a previously unrecognised link between cramp and hand tremor in children with CMT1A. Further investigation of proposed mechanisms and risk factors common to both cramp and tremor will contribute to our understanding of these common complications of CMT1A.


  1. Burns J, et al.: Determinants of reduced health related quality of life in pediatric inherited neuropathies.

    Neurology 2010, 75:726-731. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  2. Burns J, et al.: Establishment of the Australasian paediatric Charcot-Marie-Tooth disease registry.

    Neuromuscular Disord 2007, 17:349-350. Publisher Full Text OpenURL