Due to anatomical and biomechanical similarities to human shoulder, kangaroo was chosen as a model to study shoulder cartilage. Comprehensive enzymatic degradation and indentation tests were applied on kangaroo shoulder cartilage to study mechanisms underlying its strain-rate-dependent mechanical behavior. We report that superficial collagen plays a more significant role than proteoglycans in facilitating strain-rate-dependent behavior of the kangaroo shoulder cartilage. By comparing the mechanical properties of degraded and normal cartilages, it was noted that proteoglycan and collagen degradation significantly compromised strain-rate-dependent mechanical behavior of the cartilage. Superficial collagen contributed equally to the tissue behavior at all strain-rates. This is different to the studies reported on knee cartilage and confirms the importance of superficial collagen on shoulder cartilage mechanical behavior. A porohyperelastic numerical model also indicated that collagen disruption would lead to faster damage of the shoulder cartilage than when proteoglycans are depleted.
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Physical mechanisms underlying the strain-rate-dependent mechanical behavior of kangaroo shoulder cartilage
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7 September 2015
Research Article|
September 08 2015
Physical mechanisms underlying the strain-rate-dependent mechanical behavior of kangaroo shoulder cartilage
Namal Thibbotuwawa;
Namal Thibbotuwawa
1School of Chemistry, Physics and Mechanical Engineering,
Queensland University of Technology (QUT)
, 2 George Street, Brisbane, Queensland 4000, Australia
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Adekunle Oloyede;
Adekunle Oloyede
1School of Chemistry, Physics and Mechanical Engineering,
Queensland University of Technology (QUT)
, 2 George Street, Brisbane, Queensland 4000, Australia
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Tong Li;
Tong Li
1School of Chemistry, Physics and Mechanical Engineering,
Queensland University of Technology (QUT)
, 2 George Street, Brisbane, Queensland 4000, Australia
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Sanjleena Singh;
Sanjleena Singh
2Central Analytical Research Facility,
Queensland University of Technology (QUT)
, 2 George Street, Brisbane, Queensland 4000, Australia
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Wijitha Senadeera;
Wijitha Senadeera
1School of Chemistry, Physics and Mechanical Engineering,
Queensland University of Technology (QUT)
, 2 George Street, Brisbane, Queensland 4000, Australia
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YuanTong Gu
YuanTong Gu
a)
1School of Chemistry, Physics and Mechanical Engineering,
Queensland University of Technology (QUT)
, 2 George Street, Brisbane, Queensland 4000, Australia
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Appl. Phys. Lett. 107, 103701 (2015)
Article history
Received:
May 15 2015
Accepted:
August 11 2015
Citation
Namal Thibbotuwawa, Adekunle Oloyede, Tong Li, Sanjleena Singh, Wijitha Senadeera, YuanTong Gu; Physical mechanisms underlying the strain-rate-dependent mechanical behavior of kangaroo shoulder cartilage. Appl. Phys. Lett. 7 September 2015; 107 (10): 103701. https://doi.org/10.1063/1.4929498
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