Physical mechanisms underlying the strain-rate-dependent mechanical behavior of kangaroo shoulder cartilage
Thibbotuwawa, Namal, Oloyede, Adekunle, Li, Tong, Singh, Sanjleena, Senadeera, Wijitha, & Gu, YuanTong (2015) Physical mechanisms underlying the strain-rate-dependent mechanical behavior of kangaroo shoulder cartilage. Applied Physics Letters, 107(10), pp. 103701-1.
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 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 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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