Pulsatile dynamic stiffness of cartilage-like materials and use of agarose gels to validate mechanical methods and models

Scandiucci de Freitas, P. and Wirz, D. and Stolz, M. and Göpfert, B. and Friederich, N.-F. and Daniels, A. U.. (2006) Pulsatile dynamic stiffness of cartilage-like materials and use of agarose gels to validate mechanical methods and models. Journal of biomedical materials research. Part B, Applied biomaterials, Vol. 78, no. 2. pp. 347-357.

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Official URL: http://edoc.unibas.ch/dok/A5249160

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Stiffness is a fundamental indicator of the functional state of articular cartilage. Reported test modes include compressive incremental strain to determine the equilibrium modulus, and sinusoidal strain to determine the dynamic modulus and stress/strain loss angle. Here, initial development is described for a method recognizing that gait is pulsatile. Agarose gels have been used by others for validation or comparison of mechanical test methods and models for cartilage and proteoglycan aggregate. Accordingly, gels ranging from 0.5 to 20% agarose were prepared. Pulsatile stiffness in both indentation and unconfined compression were closely reproducible. Stiffness as a function of agarose concentration rose exponentially, as found using other methods. Indentation stiffness was higher than for unconfined compression and ranged from approximately 2.0 kPa for 0.5% gel to approximately 3,800 kPa for 20% gel. Pulsatile dynamic stiffness appears to be a useful method, although further development is needed. Agarose gel stiffness values obtained by other methods were reviewed for comparison. Unfortunately, reported values for a given agarose concentration ranged widely (e.g. fourfold) even when test methods were similar. Causes appear to include differences in molecular weight and gel preparation time-temperature regimens. Also, agarose is hygroscopic, leading to unintended variations in gel composition. Agarose gels are problematic materials for validation or comparison of cartilage mechanical test methods and models.
Faculties and Departments:03 Faculty of Medicine
UniBasel Contributors:Göpfert, Beat
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Interscience Publishers
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:09
Deposited On:22 Mar 2012 13:39

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