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Mechanical properties of calvarial bones in a mouse model for craniosynostosis

Moazen, Mehran; Peskett, Emma; Babbs, Christian; Pauws, Erwin; Fagan, Michael J.

Authors

Mehran Moazen

Emma Peskett

Christian Babbs

Erwin Pauws



Contributors

Nathan Jeffery
Editor

Abstract

The mammalian cranial vault largely consists of five flat bones that are joined together along their edges by soft fibrous tissues called sutures. Premature closure of the cranial sutures, craniosynostosis, can lead to serious clinical pathology unless there is surgical intervention. Research into the genetic basis of the disease has led to the development of various animal models that display this condition, e.g. mutant type Fgfr2C342Y/+ mice which display early fusion of the coronal suture (joining the parietal and frontal bones). However, whether the biomechanical properties of the mutant and wild type bones are affected has not been investigated before. Therefore, nanoindentation was used to compare the elastic modulus of cranial bone and sutures in wild type (WT) and Fgfr2C342Y/+mutant type (MT) mice during their postnatal development. Further, the variations in properties with indentation position and plane were assessed. No difference was observed in the elastic modulus of parietal bone between the WT and MT mice at postnatal (P) day 10 and 20. However, the modulus of frontal bone in the MT group was lower than the WT group at both P10 (1.39±0.30 vs. 5.32±0.68 GPa; p<0.05) and P20 (5.57±0.33 vs. 7.14±0.79 GPa; p<0.05). A wide range of values was measured along the coronal sutures for both the WT and MT samples, with no significant difference between the two groups. Findings of this study suggest that the inherent mechanical properties of the frontal bone in the mutant mice were different to the wild type mice from the same genetic background. These differences may reflect variations in the degree of biomechanical adaptation during skull growth, which could have implications for the surgical management of craniosynostosis patients.

Journal Article Type Article
Publication Date May 12, 2015
Journal PLoS ONE
Print ISSN 1932-6203
Electronic ISSN 1932-6203
Publisher Public Library of Science
Peer Reviewed Peer Reviewed
Volume 10
Issue 5
Article Number ARTN e0125757
Pages e0125757
Institution Citation Moazen, M., Peskett, E., Babbs, C., Pauws, E., & Fagan, M. J. (2015). Mechanical properties of calvarial bones in a mouse model for craniosynostosis. PloS one, 10(5), e0125757. https://doi.org/10.1371/journal.pone.0125757
DOI https://doi.org/10.1371/journal.pone.0125757
Keywords Craniosynostosis; Mice; Calvarial bones
Publisher URL http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0125757

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Copyright Statement
© 2015 Moazen et al. 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 author and source are credited.





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