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Related Experiment Video

Updated: Apr 4, 2026

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity
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Robotic axial lower leg testing: repeatability and reproducibility.

Thomas Branch1, Shaun Stinton2, Maya Sternberg3

  • 1University Orthopedics, Decatur, GA, USA.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|September 12, 2015
PubMed
Summary

A robotic testing device demonstrated high reliability for measuring lower leg laxity during simulated dial tests, showing consistent results within and across multiple days. This technology offers objective data for improved knee injury diagnosis and treatment.

Keywords:
Knee laxityManual examinationReliabilityRobotic testingRotational laxity

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Area of Science:

  • Biomechanics
  • Orthopedic testing
  • Robotics in medicine

Background:

  • Assessing lower leg laxity is crucial for diagnosing knee injuries.
  • Current methods may lack objective and repeatable measurements.
  • Robotic systems offer potential for precise and consistent biomechanical analysis.

Purpose of the Study:

  • To evaluate the test-retest reliability and multi-day repeatability of a robotic device for measuring lower leg laxity.
  • To assess the device's performance during a simulated dial test.

Main Methods:

  • Ten healthy subjects underwent testing over four days using a robotic lower leg testing system.
  • The device applied controlled external and internal rotation to a torque threshold of 5.65 Nm.
  • Load-deformation curves were analyzed using intraclass correlation coefficients (ICC) for various rotational parameters.

Main Results:

  • Average-measure ICC scores exceeded 0.95 across most of the load-deformation curve.
  • ICC scores for maximum internal and external rotation were high (0.87-0.99).
  • Reliability was confirmed for multiple measurements within and across days.

Conclusions:

  • The robotic testing device exhibits excellent reliability for rotational laxity testing.
  • Findings support the clinical use of this device for objective knee laxity assessment.
  • Objective data from this device can enhance diagnostic accuracy and treatment effectiveness for knee injuries.