Viscoelasticity of Articular Cartilage: Analysing the Effect of Induced Stress and the Restraint of Bone in a Dynamic Environment

Overview

Journal J Mech Behav Biomed Mater

Publisher Elsevier

Specialty Biomedical Engineering

Date 2017 Aug 2

PMID 28763685

Citations 27

Authors

Bernard M Lawless

Hamid Sadeghi

Duncan K Temple

Hemeth Dhaliwal

Daniel M Espino

David W L Hukins

Affiliations

Soon will be listed here.

Abstract

The aim of this study was to determine the effect of the induced stress and restraint provided by the underlying bone on the frequency-dependent storage and loss stiffness (for bone restraint) or modulus (for induced stress) of articular cartilage, which characterise its viscoelasticity. Dynamic mechanical analysis has been used to determine the frequency-dependent viscoelastic properties of bovine femoral and humeral head articular cartilage. A sinusoidal load was applied to the specimens and out-of-phase displacement response was measured to determine the phase angle, the storage and loss stiffness or modulus. As induced stress increased, the storage modulus significantly increased (p < 0.05). The phase angle decreased significantly (p < 0.05) as the induced stress increased; reducing from 13.1° to 3.5°. The median storage stiffness ranged from 548N/mm to 707N/mm for cartilage tested on-bone and 544N/mm to 732N/mm for cartilage tested off-bone. On-bone articular cartilage loss stiffness was frequency independent (p > 0.05); however, off-bone, articular cartilage loss stiffness demonstrated a logarithmic frequency-dependency (p < 0.05). In conclusion, the frequency-dependent trends of storage and loss moduli of articular cartilage are dependent on the induced stress, while the restraint provided by the underlying bone removes the frequency-dependency of the loss stiffness.

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