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Related Experiment Video

Updated: Nov 11, 2025

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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Quantitative Evaluation of Ankle Instability Using a Capacitance-Type Strain Sensor.

Atsushi Teramoto1, Kousuke Iba1, Yasutaka Murahashi1

  • 1Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan.

Foot & Ankle International
|March 27, 2021
PubMed
Summary
This summary is machine-generated.

This study developed a noninvasive capacitance-type sensor to quantitatively measure ankle instability. The sensor demonstrated high reproducibility and strong correlation with radiography, offering a safe, simple, and accurate method for assessing anterior drawer laxity.

Keywords:
ankle instabilityanterior drawer testanterior talofibular ligamentcalcaneofibular ligamentcapacitance-type strain sensorquantitative evaluation

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Area of Science:

  • Biomechanics
  • Medical Device Technology
  • Orthopedics

Background:

  • Manual assessment of ankle instability lacks quantitative precision.
  • Capacitance-type sensors offer a method for noninvasive distance measurement.
  • A novel device utilizing capacitance sensors was developed for ankle instability assessment.

Purpose of the Study:

  • To quantitatively evaluate ankle instability using a noninvasive capacitance-type sensor.
  • To assess the reliability and accuracy of the sensor compared to established methods.
  • To demonstrate the utility of the sensor for clinical application in diagnosing ankle instability.

Main Methods:

  • Experiments were conducted on embalmed cadaver ankles with sequential ligament transections (ATFL, CFL).
  • A capacitance-type sensor was integrated into a brace to measure anterior drawer distance during manual testing.
  • Clinical validation involved fitting the sensor brace to patients with a history of ankle sprain and comparing measurements to radiographic images.

Main Results:

  • Cadaver studies showed significant increases in anterior drawer distance with ligament transection (P < .001).
  • High intra- (ICC 0.862-0.939) and inter-investigator (ICC 0.815) reliability was observed.
  • In patients, sensor measurements strongly correlated with radiographic measurements (r=0.843), with minimal differences in mean distances.

Conclusions:

  • Capacitance-type sensors provide a quantitative, reproducible method for assessing anterior drawer laxity in ankle instability.
  • The developed sensor system demonstrates strong agreement with stress radiography, suggesting clinical utility.
  • This noninvasive technology offers a safe, simple, and accurate approach to evaluating ankle instability.