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Int. J. Mol. Sci. 2018, 19(2), 413; https://doi.org/10.3390/ijms19020413

Comparison of Compressive Stress-Relaxation Behavior in Osteoarthritic (ICRS Graded) Human Articular Cartilage

1
Department of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
2
Departments of Mechanical Engineering/Biomedical Engineering/Mathematics, University of Connecticut, Storrs, CT 06269, USA
3
Department of Clinical Pathology, University Hospital of Northern Norway, N-9038 Tromsø, Norway
4
Department of Orthopaedic Surgery, Trondheim University Hospital and Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Received: 5 November 2017 / Revised: 13 December 2017 / Accepted: 25 January 2018 / Published: 31 January 2018
(This article belongs to the Section Molecular Biophysics)
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Abstract

Osteoarthritis (OA) is a common joint disorder found mostly in elderly people. The role of mechanical behavior in the progression of OA is complex and remains unclear. The stress-relaxation behavior of human articular cartilage in clinically defined osteoarthritic stages may have importance in diagnosis and prognosis of OA. In this study we investigated differences in the biomechanical responses among human cartilage of ICRS grades I, II and III using polymer dynamics theory. We collected 24 explants of human articular cartilage (eight each of ICRS grade I, II and III) and acquired stress-relaxation data applying a continuous load on the articular surface of each cartilage explant for 1180 s. We observed a significant decrease in Young’s modulus, stress-relaxation time, and stretching exponent in advanced stages of OA (ICRS grade III). The stretch exponential model speculated that significant loss in hyaluronic acid polymer might be the reason for the loss of proteoglycan in advanced OA. This work encourages further biomechanical modelling of osteoarthritic cartilage utilizing these data as input parameters to enhance the fidelity of computational models aimed at revealing how mechanical behaviors play a role in pathogenesis of OA. View Full-Text
Keywords: stress-relaxation; polymer dynamics; biomechanical characterization; articular cartilage; osteoarthritis stress-relaxation; polymer dynamics; biomechanical characterization; articular cartilage; osteoarthritis
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Kumar, R.; Pierce, D.M.; Isaksen, V.; Davies, C.L.; Drogset, J.O.; Lilledahl, M.B. Comparison of Compressive Stress-Relaxation Behavior in Osteoarthritic (ICRS Graded) Human Articular Cartilage. Int. J. Mol. Sci. 2018, 19, 413.

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