NUMERICAL SIMULATIONS OF CHANGE IN TRABECULAR STRUCTURE DUE TO BONE REMODELING UNDER ULTRASOUND PROPAGATION

被引:3
作者
Hosokawa, Atsushi [1 ]
机构
[1] Akashi Natl Coll Technol, Dept Elect & Comp Engn, Akashi, Hyogo 6748501, Japan
基金
日本学术振兴会;
关键词
Bone remodeling; cancellous bone; trabecular structure; ultrasound; FDTD method; BOVINE CANCELLOUS BONE; UNIFORM STRESS STATE; TIME-DOMAIN METHOD; WAVE-PROPAGATION; QUANTITATIVE ULTRASOUND; IN-VITRO; CORTICAL BONE; MODEL; MICROSTRUCTURE; ATTENUATION;
D O I
10.1142/S0219519413500036
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Bone remodeling is defined as the coupling of bone formation and resorption on the bone surface. Numerical simulations of the remodeling in cancellous bone were performed to reproduce the change in the trabecular structure. Assuming that the formation/resorption in cancellous bone could be generated on the trabecular surface, where the local stress under the mechanical load was larger/smaller than the averaged stress on the surrounding surface, voxel trabecular elements in a numerical model of bovine cancellous bone were added/removed. An ultrasound continuous wave in the frequency range 0.1 - 1.0 MHz was applied as the mechanical load, and then, the local stress was analyzed using a finite-difference time-domain (FDTD) method. Using the remodeling simulations, both changes in the trabecular structure could be reproduced with decreasing and increasing porosity. In changes, the trabecular elements and the pore spaces became strongly oriented in the direction of ultrasound propagation. In addition, the remodeling simulations indicated that both bone formation and resorption lessened as the frequency increased.
引用
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页数:14
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