Makuch Anna M, Skalski Konstanty R, Pawlikowski Marek
Institute of Precision Mechanics, Warsaw, Poland.
Institute of Mechanics and Printing, Warsaw University of Technology, Poland.
Acta Bioeng Biomech. 2017;19(2):79-91.
The goal of the study was to determine the influence of DSI test conditions, i.e., loading/unloading rates, hold time, and the value of the maximum loading force on selected mechanical properties of trabecular bone tissue.
The test samples were resected from a femoral head of a patient qualified for a hip replacement surgery. During the DSI tests hardness (HV, HM, HIT) and elastic modulus (EIT) of trabecular bone tissue were measured using the Micro Hardness Tester (MHT, CSEM).
The analysis of the results of measurements and the calculations of total energy, i.e., elastic and inelastic (Wtotal, Welastic, Winelastic) and those of hardness and elasticity made it possible to assess the impact of the process parameters (loading velocity, force and hold time) on mechanical properties of bone structures at a microscopic level.
The coefficient k dependent on the EIT/HIT ratio and on the stored energy (ΔW = Wtotal - Welastic) is a measure of the material reaction to the loading and the deformation of tissue.
本研究的目的是确定动态压痕试验（DSI）条件，即加载/卸载速率、保持时间以及最大加载力的值对松质骨组织选定力学性能的影响。
测试样本取自一名符合髋关节置换手术条件患者的股骨头。在DSI测试过程中，使用显微硬度测试仪（MHT，CSEM）测量松质骨组织的硬度（HV、HM、HIT）和弹性模量（EIT）。
对测量结果以及总能量（即弹性和非弹性能量，Wtotal、Welastic、Winelastic）的计算分析，以及对硬度和弹性的分析，使得在微观层面评估工艺参数（加载速度、力和保持时间）对骨结构力学性能的影响成为可能。
取决于EIT/HIT比值和储存能量（ΔW = Wtotal - Welastic）的系数k是材料对组织加载和变形反应的一种度量。
