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Measuring Achilles tendon mechanical properties: a reliable, noninvasive method.

Michael F Joseph1, Kurtis R Lillie, Daniel J Bergeron

  • 1Human Performance Laboratory, Physical Therapy Program, Department of Kinesiology, University of Connecticut, Storrs, Connecticut, USA.joseph@uconn.edu

Journal of Strength and Conditioning Research
|May 8, 2012
PubMed
Summary

This study presents a reliable method using ultrasound and dynamometry to measure Achilles tendon mechanical properties. The technique offers practical applications for assessing training and treating tendinopathy.

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Area of Science:

  • Biomechanics
  • Musculoskeletal Ultrasound
  • Tendon Mechanics

Background:

  • The Achilles tendon is crucial for locomotion.
  • Accurate measurement of its mechanical properties is vital for understanding injury and optimizing performance.
  • Existing methods may lack reliability or cost-effectiveness.

Purpose of the Study:

  • To introduce a cost-effective and highly reliable methodology for assessing Achilles tendon mechanical and material properties.
  • To validate the reliability of the proposed measurement technique.

Main Methods:

  • Subjects performed maximal isometric plantarflexion contractions using an isokinetic dynamometer.
  • Diagnostic ultrasound visualized a distal soleus tendon fascicle.
  • Force-elongation curves were generated from torque output and fascicle excursion to derive mechanical properties.

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Main Results:

  • The methodology demonstrated excellent intrasession and intersession reliability for both dynamometer and excursion measures (ICC > 0.93).
  • Mechanical and material properties of the Achilles tendon can be reliably derived.

Conclusions:

  • This synchronized ultrasound and dynamometry approach provides a reliable and cost-effective means to measure Achilles tendon properties.
  • The technique has significant potential for evaluating training adaptations and managing tendinopathy.