Characterization of bovine cartilage by fiber Bragg grating-based stress relaxation measurements

V. Baier; G. Marchi; P. Foehr; R. Burgkart; J. Roths

doi:10.1117/12.2263453

23 April 2017 Characterization of bovine cartilage by fiber Bragg grating-based stress relaxation measurements

V. Baier, G. Marchi, P. Foehr, R. Burgkart, J. Roths

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103230G (2017) https://doi.org/10.1117/12.2263453
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

A fiber-based device for testing mechanical properties of cartilage is presented within this study. The measurement principle is based on stepwise indentation into the tissue and observing of corresponding relaxation of the stress. The indenter tip is constituted of a cleaved optical fiber that includes a fiber Bragg grating which is used as the force sensor. Stress relaxation measurements at 25 different positions on a healthy bovine cartilage sample were performed to assess the behavior of healthy cartilage. For each indentation step a good agreement was found with a viscoelastic model that included two time constants. The model parameters showed low variability and a clear dependence with indentation depth. The parameters can be used as reference values for discriminating healthy and degenerated cartilage.

Citation Download Citation

V. Baier, G. Marchi, P. Foehr, R. Burgkart, and J. Roths "Characterization of bovine cartilage by fiber Bragg grating-based stress relaxation measurements", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230G (23 April 2017); https://doi.org/10.1117/12.2263453

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