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Related Experiment Video

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Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research
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A multiscale study of morphological changes in tendons following repeated cyclic loading.

Anas K Al Makhzoomi1, Thomas B Kirk2, Garry T Allison3

  • 1School of Allied Health, Faculty of Health Science, Curtin University, Perth, Western Australia, Australia.

Journal of Biomechanics
|October 11, 2021
PubMed
Summary

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Repeated loading significantly impairs Achilles tendon mechanical function and structure. This study reveals how cellular changes and D-periodicity lengthening correlate with tendon damage, offering insights into pathology mechanisms.

Area of Science:

  • Biomechanics
  • Cell Biology
  • Tendon Research

Background:

  • Tendon injuries are common, affecting mechanical function and cellular structure.
  • Understanding the multiscale response of tendons to load is crucial for injury prevention and treatment.

Purpose of the Study:

  • To concurrently assess the mechanical and morphological changes in rabbit Achilles tendons under fatigue loading.
  • To investigate the relationship between cellular changes, structural alterations, and mechanical decline.

Main Methods:

  • Utilized mechanical testing and confocal arthroscopy (CA) on white New Zealand rabbit Achilles tendons.
  • Applied prolonged cyclic and static loading at varying strain levels (3%, 6%, 9%) for up to four hours.
  • Assessed macroscale properties including tenocyte morphology, fiber anisotropy, waviness, and mechanical profiles.
Keywords:
Atomic force microscopyConcurrent nanostructural, macrostructural and mechanical assessmentConfocal arthroscopyForce transmission in tendonsTendon structure-function relationships

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Main Results:

  • Increased strain and loading cycles significantly reduced mechanical function (p < 0.05).
  • Repeated loading led to loss of mechanical and structural resilience at the macroscale (p < 0.05).
  • Lengthening of D-periodicity strongly correlated with mechanical decline and tenocyte shape loss.

Conclusions:

  • This study provides the first concurrent assessment of form and function in tendons under strain-mediated loading.
  • Identified multiscale properties contributing to tendon pathology mechanisms.
  • Highlights the link between cellular morphology, structural changes, and functional impairment in tendons.