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Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing
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Indentation across interfaces between stiff and compliant tissues.

Oliver E Armitage1, Michelle L Oyen1

  • 1Cambridge University Engineering Dept, The Nanoscience Centre, 11 JJ Thomson Avenue, Cambridge CB3 0FF, UK.

Acta Biomaterialia
|January 8, 2017
PubMed
Summary

Instrumented indentation can accurately measure mechanical properties at tissue interfaces, crucial for understanding orthopedic injuries and guiding tissue engineering. Guidelines are provided for optimal indenter size to ensure accurate characterization of heterogeneous materials.

Keywords:
Elastic modulusEnthesisFinite elementNanoindentation

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Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Orthopedic Research

Background:

  • Orthopedic injuries frequently occur at interfaces between tissues with vastly different mechanical properties, such as bone-tendon, bone-ligament, and bone-cartilage.
  • These multi-tissue interfaces are critical for load transfer, and their failure contributes to a high incidence of orthopedic injuries.
  • Current limitations in surgical repair and regeneration strategies highlight the need for better characterization of these natural structures.

Purpose of the Study:

  • To evaluate the accuracy of instrumented indentation in characterizing the mechanical properties of biological tissues and engineered scaffolds at interfaces with significant material property variations.
  • To develop guidelines for using instrumented indentation to accurately assess modulus variations across dissimilar tissue interfaces.

Main Methods:

  • Utilized finite element simulations to model indentation across interfaces between materials with orders of magnitude differences in mechanical properties.
  • Employed reference samples and experimental validation to assess the accuracy of indentation measurements.
  • Determined the relationship between indenter size and the accuracy of modulus measurement in heterogeneous materials.

Main Results:

  • Finite element simulations accurately predicted discrepancies between measured and true modulus functions across interfaces.
  • Instrumented indentation can accurately characterize elastic modulus variations across tissue interfaces.
  • For accurate assessment of heterogeneous tissues, indenter size should be less than 10% of the modulus variation length scale.

Conclusions:

  • Instrumented indentation is a valuable tool for characterizing mechanical properties at complex tissue interfaces.
  • Understanding these mechanical properties is essential for advancing tissue engineering and developing effective treatments for orthopedic injuries.
  • Guidelines are provided to optimize the use of instrumented indentation for accurate material property assessment at interfaces.