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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
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Related Experiment Video

Updated: Jul 3, 2026

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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In vivo strain measurements in the human buttock during sitting using MR-based digital volume correlation.

Stefano Zappalá1, Bethany E Keenan2, David Marshall3

  • 1School of Computer Science and Informatics, Cardiff University, Cardiff, UK; Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, UK.

Journal of Biomechanics
|January 5, 2024
PubMed
Summary

This study quantifies buttock soft tissue deformation under pressure using 3D MRI scans and digital volume correlation (DVC). Results reveal significant tissue sliding and strain, crucial for understanding pressure ulcer prevention.

Keywords:
Deep tissue injuryDigital volume correlationPressure ulcersSoft tissuesStrain analysis

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Tissue Engineering

Background:

  • Pressure ulcer prevention requires understanding soft tissue response to compressive loads.
  • Detailed knowledge of buttock deformation is essential for developing effective management systems.

Purpose of the Study:

  • To quantify progressive soft tissue deformation in the buttock using 3D measurements.
  • To provide a public dataset of soft tissue displacements for further research.

Main Methods:

  • Utilized Magnetic Resonance (MR) scans of 10 healthy subjects in a semi-recumbent position.
  • Employed digital volume correlation (DVC) to measure 3D soft tissue displacements.
  • Optimized global and deformable registration methods, validating against simulated data.

Main Results:

  • Quantified gluteus maximus sliding away from the ischial tuberosity (average 13.74 mm), highlighting the ischial bursa's role.
  • Identified peak shear strain in subcutaneous fat near the muscle interface, exceeding known damage thresholds.
  • Demonstrated complex soft tissue deformation patterns under sitting loads.

Conclusions:

  • Soft tissue deformation in the buttock is complex and requires further investigation.
  • Factors like tissue geometry, load duration/extent, posture, and properties influence deformation.
  • The findings are critical for advancing pressure ulcer prevention and management strategies.