New insights into the viscoelastic and failure mechanical properties of the elastic fiber network of the inter-lamellar matrix in the annulus fibrosus of the disc

Acta Biomaterialia
J Tavakoli, John J Costi

Abstract

The mechanical role of elastic fibers in the inter-lamellar matrix (ILM) is unknown; however, it has been suggested that they play a role in providing structural integrity to the annulus fibrosus (AF). Therefore, the aim of this study was to measure the viscoelastic and failure properties of the elastic fiber network in the ILM of ovine discs under both tension and shear directions of loading. Utilizing a technique, isolated elastic fibers within the ILM from ovine discs were stretched to 40% of their initial length at three strain rates of 0.1% s-1 (slow), 1% s-1 (medium) and 10% s-1 (fast), followed by a ramp test to failure at 10% s-1. A significant strain-rate dependent response was found, particularly at the fastest rate for phase angle and normalized stiffness (p < 0.001). The elastic fibers in the ILM demonstrated a significantly higher capability for energy absorption at slow compared to medium and fast strain rates (p < 0.001). These finding suggests that the elastic fiber network of the ILM exhibits nonlinear elastic behavior. When tested to failure, a significantly higher normalized failure force was found in tension compared to shear loading (p = 0.011), which is consistent with the orthotropic structure of elastic ...Continue Reading

Citations

Jul 16, 2020·International Journal of Molecular Sciences·Javad TavakoliJoanne L Tipper
Apr 12, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Shambo Bhattacharya, Devendra K Dubey
Nov 26, 2021·Journal of Biomechanical Engineering·Shambo Bhattacharya, Devendra K Dubey

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