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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Shearing Stress01:18

Shearing Stress

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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
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Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Related Experiment Video

Updated: Mar 3, 2026

Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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Extensor indicis proprius tendon transfer using shear wave elastography.

J Lamouille1, C Müller1, S Aubry2

  • 1Service de chirurgie plastique et de la main, département de l'appareil locomoteur, centre hospitalier universitaire vaudois (CHUV), rue du Bugnon 46, 1011 Lausanne, Switzerland.

Hand Surgery & Rehabilitation
|May 4, 2017
PubMed
Summary
This summary is machine-generated.

Shear wave elastography (SWE) offers a new way to measure muscle stiffness during tendon transfers. This quantitative method may improve surgical precision by providing objective data on tissue tension.

Keywords:
ElastographyMécanismes musculosquelettiquesSkeletal muscle mechanicsTendon transferTransfert tendineuxWide-awake hand surgeryÉlastographie

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Musculoskeletal Imaging

Background:

  • Assessing optimal tension during tendon transfers is currently subjective and lacks precise quantification.
  • Existing methods rely on approximate measurements, potentially leading to suboptimal surgical outcomes.

Purpose of the Study:

  • To demonstrate the feasibility of quantitatively assessing muscular mechanical properties intraoperatively using shear wave elastography (SWE).
  • To evaluate the application of SWE during extensor indicis proprius (EIP) transfer for post-traumatic extensor pollicis longus rupture.

Main Methods:

  • Ultrasound elastography (SWE) was used to measure the elasticity modulus of the EIP muscle.
  • Measurements were taken at various stages: rest, active extension, active extension against resistance, post-section, and post-transfer.
  • Two cases of EIP transfer were analyzed to assess the distribution of elasticity modulus values.

Main Results:

  • Distinct shear wave velocity and elasticity modulus values were observed at different surgical stages.
  • The elasticity modulus varied significantly, decreasing from 565.1 kPa (active extension against resistance) to 15.3 kPa (post-tendon section).
  • Elasticity modulus values showed consistent distribution patterns across both patients.

Conclusions:

  • SWE provides quantitative data on muscle elasticity during tendon transfers, offering a potential improvement over subjective assessments.
  • This technique may enhance intraoperative adjustments by providing objective feedback on tissue tension and mechanical properties.
  • This study represents the first investigation into the therapeutic benefits of SWE in tendon transfer surgery.