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Related Experiment Video

Updated: Sep 10, 2025

A Fluorescent Intravital Imaging Approach to Study Load-Induced Calcium Signaling Dynamics in Mouse Osteocytes
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Non-physiological direction loading increases bone adaptive responses by enhancing lacunocanalicular fluid dynamics.

Yuan Wang1, Ruisen Fu1, Haisheng Yang1

  • 1Department of Biomedical Engineering, College of Chemistry and Life Science, Beijing University of Technology, Beijing 100124, China.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|August 22, 2025
PubMed
Summary

Bone adaptation is more sensitive to non-physiological loading directions, driven by enhanced fluid flow in the lacunocanalicular network (LCN), not strain magnitude. This finding explains error-driven bone remodeling.

Keywords:
bone adaptationfinite element modelingfluid flowlacunocanalicular networkmechanical loading

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Area of Science:

  • Biomechanical Engineering
  • Skeletal Biology
  • Mechanobiology

Background:

  • Bone adaptation is proposed to be "error-driven", with increased sensitivity to non-physiological loading.
  • The precise mechanisms underlying differential bone responses to physiological versus non-physiological loading remain unclear.

Purpose of the Study:

  • To investigate the hypothesis that non-physiological loading enhances osteogenesis via increased fluid flow within the lacunocanalicular network (LCN), irrespective of strain magnitude.
  • To elucidate the role of fluid dynamics within the LCN in bone mechanoadaptation.

Main Methods:

  • In vivo mouse tibia loading models (axial and transversal) under strain-matched conditions to assess bone formation.
  • Development of an in silico whole bone-LCN multiscale model to compute strains and fluid shear stresses.
  • Regression analyses to correlate bone mechanoresponses with fluid shear stress and strain.

Main Results:

  • Transversal loading induced a greater cortical bone response than axial loading, despite matched strain magnitudes.
  • The enhanced bone response to transversal loading was linked to increased lacunocanalicular fluid flow, not strain.
  • Strong correlations were observed between bone mechanoresponses and fluid shear stress, but not strain.

Conclusions:

  • Bone adaptation is more sensitive to loading direction than strain magnitude, supporting the "error-driven" model.
  • Enhanced fluid flow within the LCN is a key mechanism mediating bone adaptation to non-physiological loading.
  • The fluid dynamic microenvironment of the LCN plays a critical role in regulating bone mechanoadaptation.