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OpenTrials
Active, Not Recruiting

NCT Number: NCT06544824

Accuracy Comparison: Optoelectronic Motion Capture and Markerless System

The purpose of this study was to assess the Openpose reliability to measure kinematics and spatiotemporal gait parameters and to evaluate the minimum technical requirements. This analysis used video and optoelectronic motion capture simultaneously recorded. We assessed more of 20 subject with different motor gait impairments

Active, Not Recruiting

This study is active but is not currently recruiting participants.

Key information

Conditions

Children, Adult Mental Disorders Motor Disorders

Age range

4 year–65 year

Sex eligibility

All sexes

Study type

Observational

Primary location

IRCCS E. Medea

Bosisio Parini, Italy, 22037

About this study

Marker-based Optical motion tracking is the gold standard in gait analysis, but today, markerless solutions are growing rapidly. Treatment of physical impairments could improve if supported with reliable motion capture. Moreover, the use of markerless technology offers numerous advantages for working with pediatric populations under various conditions. In this paper, we assess the Openpose reliability to measure kinematics and spatiotemporal gait parameters and to evaluate the minimum technical requirements., in a population of children with and without gait impairments. Validating markerless methods can open the way for new motion capture techniques and enhance the accessibility of kinematic measurements and improve the treatment of physical impairments.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age over 4 years;
  • Ability to walk independently without walking aids and/or orthoses.

Exclusion criteria

  • Inability to walk independently and safely for short distances without walking aids and/or orthoses.

Treatment and study plan

Measure gait spatiotemporal parameters and kinematics from optoelectronic system

Other

The raw data acquired from motion capture system were processed with Smart Analyzer software (BTS Bioengineering, Milano, Italy). First, the 3D data were filtered and interpolated in case of missing data for short time. Then spatial-temporal parameters (cycle duration, cadence, gait speed, stance phase, swing phase, double-support phase, stride length and step width) and conventional kinematic parameters of traditional Davis marker-set protocols were computed.

Measure gait spatiotemporal parameters and kinematics from markerless system

Other

The two videos were elaborated using OpenPose that returns a set of 25 2D keypoints coordinates for body pose estimation for each video. Key-points were located in relevant body landmarks and it were used to determine the 2D Cartesian coordinates on the sagittal plane and on the frontal plane. The data calculated with routines were filtered and interpolated in case of missing data. With respect to kinematic parameters, the segment and joint angles were measured from the estimated feature points of each joint. Spatiotemporal gait parameters were calculated using successive heel strike and toe-off events.

Quantify tip toe step during gait from kinematic

Other

The kinematic features calculated are used to identify and count the number of tip toe steps during gait or standing

Primary outcomes

  1. Absolute Error

    Time frame: Through study completion, an average of 1 year

    Absolute errors were calculated for the kinematics parameters and for each spatiotemporal variable by taking the absolute value after subtracting the values obtained using pose estimation methods from the value measured using markerbased motion capture

  2. intraclass correlation coefficients

    Time frame: Through study completion, an average of 1 year

    To confirm whether the data obtained by OpenPose agreed with the data from the optoelectronic system, investigators calculated the ICCs (two-way mixed effects model, absolute agreement, average measurements) between the spatiotemporal and kinematic data from both systems. The ICC values were interpreted as follows: poor agreement for ICC < 0.5, moderate agreement for values between 0.5 and 0.75, good agreement for values between 0.75 and 0.9, and excellent agreement for values greater than 0.90.

  3. cross-correlation coefficients

    Time frame: Through study completion, an average of 1 year

    The cross-correlation coefficients (CCC) between both systems were used to evaluate the similarity of angles during the gait cycle. The CCC values were interpreted as follows: weak or no coupling for values between -0.3 and 0.3, moderate coupling for values between 0.3 and 0.7 or -0.7 and -0.3, and strong coupling for values greater than 0.7 or less than -0.7.

Sponsors and collaborators

Lead sponsor

IRCCS Eugenio Medea

Other

Registry information

Official study title

Accuracy of Markerless Motion Analysis in Comparison With Optoelectronic Motion Capture System

Acronym: OPR

Important dates

Study start
2024
Primary completion
2026
Study completion
2026
First posted
Aug 9, 2024
Registry last updated
Feb 27, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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