Strain rate dependency of bovine trabecular bone under impact loading at sideways fall velocity

Journal of Biomechanics
W Enns-BrayB Helgason

Abstract

There is currently a knowledge gap in scientific literature concerning the strain rate dependent properties of trabecular bone at intermediate strain rates. Meanwhile, strain rates between 10 and 200/s have been observed in previous dynamic finite element models of the proximal femur loaded at realistic sideways fall speeds. This study aimed to quantify the effect of strain rate (ε̇) on modulus of elasticity (E), ultimate stress (σu), failure energy (Uf), and minimum stress (σm) of trabecular bone in order to improve the biofidelity of material properties used in dynamic simulations of sideways fall loading on the hip. Cylindrical cores of trabecular bone (D = 8 mm, Lgauge = 16 mm, n = 34) from bovine proximal tibiae and distal femurs were scanned in µCT (10 µm), quantifying apparent density (ρapp) and degree of anisotropy (DA), and subsequently impacted within a miniature drop tower. Force of impact was measured using a piezoelectric load cell (400 kHz), while displacement during compression was measured from high speed video (50,000 frames/s). Four groups, with similar density distributions, were loaded at different impact velocities (0.84, 1.33, 1.75, and 2.16 m/s) with constant kinetic energy (0.4 J) by adjusting the impact...Continue Reading

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Citations

Feb 25, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Fatemeh JazinizadehCheryl E Quenneville
Mar 31, 2019·Acta Biomaterialia·Xuedong ZhaiWeinong W Chen
Jul 27, 2021·Biomechanics and Modeling in Mechanobiology·Zhenzi LiLin Cai

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