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Fluid-solid coupling numerical simulation of entire rat caudal vertebrae under dynamic loading.

Sen Zhao1, Yan Gao2, Ailing Yang1

  • 1Biomechanics Lab, Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing, China.

Computer Methods in Biomechanics and Biomedical Engineering
|January 17, 2024
PubMed
Summary

Bone trabeculae grow directionally with applied force. Higher fluid shear stress (FSS) in specific bone regions enhances mechanical stimulation, offering insights into treating bone diseases like osteoporosis.

Keywords:
Vertebral bonefluid-solid couplingosteocytestrabecular bonewall FSS

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Area of Science:

  • Biomedical Engineering
  • Mechanobiology
  • Skeletal Biology

Background:

  • Trabecular bone remodeling is crucial for skeletal health, involving osteocytes, osteoblasts, and osteoclasts.
  • Imbalances in bone remodeling lead to diseases such as osteosclerosis, osteoporosis, and osteonecrosis.
  • Understanding mechanotransduction in bone cells is key for treating bone pathologies.

Purpose of the Study:

  • To investigate fluid flow and osteocyte mechanical response in vertebral trabecular bone under physiological loading.
  • To analyze the relationship between fluid shear stress (FSS) distribution and mechanical stimulation of osteocytes.
  • To explore potential therapeutic strategies for bone diseases based on the bone cell mechanical microenvironment.

Main Methods:

  • Developed a fluid-solid coupling model of rat tail vertebrae using micro-CT imaging.
  • Simulated tensile loading experiments to analyze bone marrow flow characteristics.
  • Quantified osteocyte mechanical responses and fluid shear stress (FSS) distribution within the trabecular bone structure.

Main Results:

  • Identified a U-shaped distribution of wall fluid shear stress (FSS) along the longitudinal axis of trabecular bone.
  • Demonstrated that regions with higher FSS exhibit greater mechanical stimulation on osteocytes.
  • Revealed a positive correlation between the mechanical microenvironment and bone cell activity.

Conclusions:

  • The mechanical microenvironment significantly influences osteocyte behavior and bone remodeling.
  • Fluid shear stress (FSS) distribution is a critical factor in bone mechanotransduction.
  • Findings provide a basis for developing novel therapeutic strategies for bone-related diseases.