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Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing
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Automatic characterization of soft tissues material properties during mechanical tests.

Bernardo Innocenti1, Jean-Charles Larrieu1, Pierre Lambert1

  • 1BEAMS Department, Université Libre de Bruxelles, Bruxelles, Belgium.

Muscles, Ligaments and Tendons Journal
|May 4, 2018
PubMed
Summary

A new contactless, automatic protocol accurately determines soft tissue properties like Young's modulus. This validated method ensures reliable material characterization for ligaments and tendons.

Keywords:
contactlessligamentspoisson’s ratiotendonsyoung’s modulus

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Area of Science:

  • Biomechanics
  • Materials Science
  • Biomedical Engineering

Background:

  • Estimating viscoelastic properties of soft tissues (ligaments, tendons) is challenging due to procedural limitations.
  • Existing methods often lack accuracy and automation for comprehensive material behavior analysis.

Purpose of the Study:

  • To develop and validate a contactless, automatic protocol for determining soft tissue material properties.
  • To enable accurate characterization of non-linear viscoelastic behavior in biological tissues.

Main Methods:

  • A uniaxial tensile test was performed on soft tissue specimens with markers.
  • An automated, camera-based system tracked marker displacement to calculate true stress/strain curves.
  • Young's modulus and Poisson's ratio were computed for specific regions of interest.

Main Results:

  • The protocol demonstrated high repeatability and accuracy, with a maximum 3.7% error for Young's modulus on synthetic materials.
  • The procedure proved reliable and operator-independent.
  • Successful application to pig Achilles and human patellar tendons validated its efficacy for biological tissues.

Conclusions:

  • An automated, accurate protocol for soft tissue material property determination has been successfully developed and validated.
  • This approach offers a robust method for the mechanical characterization of diverse biological soft tissues.
  • The contactless procedure enhances reliability and applicability in soft tissue research.