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Cartilage labelling for mechanical testing in T-peel configuration

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Abstract

Purpose

The purpose of this study was to find a suitable method of labelling cartilage samples for the measurement of distraction distances in biomechanical testing.

Methods

Samples of bovine cartilage were labelled using five different methods: hydroquinone and silver nitrate (AgNO3), potassium permanganate (KMnO4) with sodium thiosulphate (Na2S2O3), India ink, heat, and laser energy. After the labelling, we analysed the cartilage samples with regard to cytotoxity by histochemical staining with ethidiumbromide homodimer (EthD-1) and calcein AM. Furthermore, we tested cartilages labelled with India ink and heat in a T-peel test configuration to analyse possible changes in the mechanical behaviour between marked and unlabelled samples.

Results

Only the labelling methods with Indian ink or a heated needle showed acceptable results in the cytotoxity test with regard to labelling persistence, accuracy, and the influence on consistency and viability of the chondrocytes. In the biomechanical T-peel configuration, heat-labelled samples collapsed significantly earlier than unlabelled samples.

Conclusion

Labelling bovine cartilage samples with Indian ink in biomechanical testing is a reliable, accurate, inexpensive, and easy-to-perform method. This labelling method influenced neither the biomechanical behaviour nor the viability of the tissue compared to untreated bovine cartilage.

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Acknowledgement

We would like to thank Richard Kujat and Sandra Rohde in the experimental laboratory of the trauma unit of the Medical Centre of the University of Regensburg for their kind support. We are grateful to the University Medical Centre Regensburg for their financial support within the ReForM-C grant as well as to the DFG for their financial support for publication.

The linguistic assistance of Ms Monika Schoell is gratefully acknowledged. We state no conflict of interest.

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Correspondence to Carsten Englert.

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Pfeifer, C., Müller, M., Prantl, L. et al. Cartilage labelling for mechanical testing in T-peel configuration. International Orthopaedics (SICOT) 36, 1493–1499 (2012). https://doi.org/10.1007/s00264-011-1468-3

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  • DOI: https://doi.org/10.1007/s00264-011-1468-3

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