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Development and validation of a robotic system for ankle joint testing.

Hadi El Daou1, James D Calder2, Joanna M Stephen2

  • 1Imperial College London, South Kensington Campus, London SW7 2AZ, UK.

Medical Engineering & Physics
|October 23, 2018
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Summary

A new robotic system accurately tests ankle joint mechanics, crucial for improving sports injury treatments and patient recovery after surgery. This technology enhances understanding of ankle laxity and motion.

Keywords:
AnkleBiomechanicsIn vitroOptical trackingRobotics

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Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Robotics

Background:

  • Ankle sprains are common sports injuries, impacting patient quality of life.
  • Improved understanding of ankle mechanics is vital for enhancing surgical treatments and patient outcomes.

Purpose of the Study:

  • To develop and validate a robotic system for precise ankle joint testing.
  • To simulate standardized clinical ankle laxity tests and analyze joint kinematics.

Main Methods:

  • An industrial robot equipped with a force/torque sensor and custom holders was utilized.
  • A specimen preparation protocol involving optical tracking for ankle specimen registration was implemented.
  • A registration technique calibrated the coordinate system for controlling joint degrees of freedom and simulating laxity tests.

Main Results:

  • The robotic system successfully simulated clinical ankle laxity tests at various flexion angles.
  • Optical tracking validated robot measurements, showing high interclass coefficients (0.991-0.999) for translations and rotations.
  • The system demonstrated high accuracy in measuring anterior-posterior translations, internal-external rotations, and inversion-eversion rotations.

Conclusions:

  • The developed robotic system provides a reliable and accurate method for ankle joint testing.
  • This technology can significantly contribute to a better understanding of ankle biomechanics.
  • Validated robotic testing enhances the potential for improved treatments and patient quality of life following ankle injuries.