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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Design of a Biaxial Mechanical Loading Bioreactor for Tissue Engineering
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Osteocyte shape and mechanical loading.

René F M van Oers1, Hong Wang, Rommel G Bacabac

  • 1Department of Oral Cell Biology, ACTA - University of Amsterdam and VU University Amsterdam, MOVE Research Institute Amsterdam, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands, rfmvoers@gmail.com.

Current Osteoporosis Reports
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Summary

Osteocyte lacuna shape influences bone mechanosensation and may be affected by mechanical loading and collagen alignment. Understanding this relationship is crucial for bone health and pathology research.

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Area of Science:

  • Bone biology
  • Mechanobiology
  • Skeletal tissue engineering

Background:

  • Osteocytes are bone cells crucial for sensing mechanical forces.
  • The shape of osteocyte lacunae (cavities) varies significantly.
  • This variation may impact osteocyte function in bone mechanosensation.

Purpose of the Study:

  • To review how mechanical loading influences osteocyte lacuna shape.
  • To explore the relationship between osteocyte shape and mechanosensation.
  • To consider the role of lacunar morphology in bone pathology.

Main Methods:

  • Review of recent scientific literature on osteocyte morphology and mechanobiology.
  • Analysis of studies investigating osteocyte lacunae alignment to collagen fibers.
  • In vitro studies examining osteocyte mechanosensitivity based on cell shape.

Main Results:

  • Osteocyte lacunae align with collagen fibers, whose orientation is load-dependent.
  • In vitro, round osteocytes exhibit higher mechanosensitivity than flat ones.
  • Changes in lacunar shape are linked to bone diseases.

Conclusions:

  • Mechanical loading, via collagen alignment, may shape osteocyte lacunae.
  • Osteocyte shape is a potential factor in their mechanosensory role.
  • Investigating lacunar morphology is important for understanding bone pathology etiology.