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Robotic Ankle Assessment Post-Stroke: Reliability, Comparison to Therapists, and Benchmark Dataset Development.

Christopher A Johnson1, Andria J Farrens2, Piyashi Biswas3

  • 1Rancho Los Amigos National Rehabilitation Center, Rancho Research Institute, Downey, CA 90242, USA.

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|October 29, 2025
PubMed
Summary
This summary is machine-generated.

Sensorized robotic platforms offer reliable and objective ankle assessments, providing more detailed data than traditional methods for stroke rehabilitation research. These tools enhance motor function evaluation and personalized treatment strategies.

Keywords:
ankle motor functionrobotic assessmenttest–retest reliability

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Area of Science:

  • Rehabilitation Engineering
  • Biomechanics
  • Neurorehabilitation

Background:

  • Clinical outcome measures in rehabilitation research can be too coarse to detect subtle intervention effects.
  • Sensorized robotic platforms show promise for improving motor function evaluation, but their reliability against expert therapists needs clarification.

Purpose of the Study:

  • To assess the test-retest reliability of a robotic device for measuring ankle active and passive range of motion (AROM, PROM) and maximum voluntary contraction (MVC).
  • To compare robotic assessments with traditional therapist evaluations (goniometer, MMT) in post-stroke individuals and unimpaired adults.
  • To evaluate the potential of robotic platforms for providing more granular and objective motor function data.

Main Methods:

  • A robotic device was used to measure ankle AROM, PROM, and MVC in 34 chronic hemiparetic post-stroke individuals and 62 unimpaired adults (young and older).
  • Test-retest reliability was assessed over two days for both the robot and experienced therapists.
  • Robotic measurements were compared with therapist assessments using correlation and difference analyses.

Main Results:

  • High test-retest reliability (ICC > 0.86) was observed for both robotic and therapist-based AROM and MVC measures across all participant groups.
  • Robotic AROM and PROM measurements showed strong correlations with therapist assessments (r > 0.60) but were significantly larger.
  • Robotic MVC measurements provided greater detail than the therapist's manual muscle testing (MMT), revealing a wider range of torque values.

Conclusions:

  • Sensorized robotic platforms demonstrate high reliability and strong agreement with therapist assessments for ankle motor function evaluation.
  • Robotic devices offer enhanced granularity, particularly for MVC, which can improve the tracking of motor recovery and inform tailored rehabilitation strategies.
  • These findings support the clinical utility of robotic platforms as objective tools to augment traditional assessments in rehabilitation research.