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Updated: Oct 30, 2025

Movement Retraining using Real-time Feedback of Performance

Movement Retraining using Real-time Feedback of Performance

Published on: January 17, 2013

Validation of a portable marker-based motion analysis system.

Shaobai Wang¹, Xiaolong Zeng^2,3, Liang Huangfu¹

¹Department of Kinesiology, Shanghai University of Sport, Shanghai, China.

Journal of Orthopaedic Surgery and Research

|July 4, 2021

Summary

This summary is machine-generated.

The Opti_Knee system accurately tracks knee motion, showing strong correlation with biplanar fluoroscopy. This gait analysis tool is a promising option for clinical knee assessments.

Keywords:

Biplanar fluoroscopy Kinematics Knee Marker-based motion analysis

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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Last Updated: Oct 30, 2025

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Published on: January 17, 2013

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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Published on: August 30, 2016

Area of Science:

Biomechanics
Orthopedics
Motion Analysis

Background:

The Opti_Knee system is a marker-based motion capture technology for analyzing knee joint 6 degrees of freedom (6DOF) motion.
Previous validation studies for the Opti_Knee system's accuracy were not available.

Purpose of the Study:

To validate the accuracy of the Opti_Knee system.
To compare Opti_Knee system's knee motion tracking with biplanar fluoroscopy.

Main Methods:

Recorded 6DOF knee kinematics during flexion-extension and level walking using Opti_Knee.
Compared Opti_Knee data with biplanar fluoroscopy measurements.
Calculated root mean square error (RMSE) for translational and rotational accuracy.
Utilized Pearson correlation tests to assess kinematic trends.

Main Results:

Flexion-extension cycles showed average translational accuracy (RMSE) of 2.7-3.7 mm and rotational accuracy of 1.7-3.8°.
Gait cycles demonstrated RMSEs for angular kinematics between 1.4° and 3.2°, and translational kinematics between 3.2 mm and 4.2 mm.
Pearson correlation coefficients were high, ranging from 0.858 to 0.999 for translation and angles.

Conclusions:

The Opti_Knee gait system demonstrates acceptable accuracy and strong correlation compared to biplanar fluoroscopy.
Opti_Knee shows potential as a portable clinical tool for dynamic knee function assessments.