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PLoS One. 2016 Nov 18;11(11):e0166532. doi: 10.1371/journal.pone.0166532. eCollection 2016.

Accuracy and Reliability of the Kinect Version 2 for Clinical Measurement of Motor Function.

Author information

1
Motognosis UG (haftungsbeschränkt), Berlin, Germany.
2
Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany.
3
NeuroCure Clinical Research Center and Clinical and Experimental Multiple Sclerosis Research Center, Charité - Universitätsmedizin Berlin, Berlin, Germany.
4
Department of Neurology, Charité - Universitätsmedizin Berlin, Berlin, Germany.
5
Experimental and Clinical Research Center, Max Delbrück Center for Molecular Medicine and Charité - Universitätsmedizin Berlin, Berlin, Germany.

Abstract

BACKGROUND:

The introduction of low cost optical 3D motion tracking sensors provides new options for effective quantification of motor dysfunction.

OBJECTIVE:

The present study aimed to evaluate the Kinect V2 sensor against a gold standard motion capture system with respect to accuracy of tracked landmark movements and accuracy and repeatability of derived clinical parameters.

METHODS:

Nineteen healthy subjects were concurrently recorded with a Kinect V2 sensor and an optical motion tracking system (Vicon). Six different movement tasks were recorded with 3D full-body kinematics from both systems. Tasks included walking in different conditions, balance and adaptive postural control. After temporal and spatial alignment, agreement of movements signals was described by Pearson's correlation coefficient and signal to noise ratios per dimension. From these movement signals, 45 clinical parameters were calculated, including ranges of motions, torso sway, movement velocities and cadence. Accuracy of parameters was described as absolute agreement, consistency agreement and limits of agreement. Intra-session reliability of 3 to 5 measurement repetitions was described as repeatability coefficient and standard error of measurement for each system.

RESULTS:

Accuracy of Kinect V2 landmark movements was moderate to excellent and depended on movement dimension, landmark location and performed task. Signal to noise ratio provided information about Kinect V2 landmark stability and indicated larger noise behaviour in feet and ankles. Most of the derived clinical parameters showed good to excellent absolute agreement (30 parameters showed ICC(3,1) > 0.7) and consistency (38 parameters showed r > 0.7) between both systems.

CONCLUSION:

Given that this system is low-cost, portable and does not require any sensors to be attached to the body, it could provide numerous advantages when compared to established marker- or wearable sensor based system. The Kinect V2 has the potential to be used as a reliable and valid clinical measurement tool.

PMID:
27861541
PMCID:
PMC5115766
DOI:
10.1371/journal.pone.0166532
[Indexed for MEDLINE]
Free PMC Article

Conflict of interest statement

Authors SMM and AUB hold stocks of Motognosis UG. Motognosis UG filed for patent (DE201410013828) using Kinect technology in postural control. Authors TSH, FP and JV report nothing to disclose. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

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