The measurement of in vivo joint angles during a squat using a single camera markerless motion capture system as compared to a marker based system

Anne Schmitz, Mao Ye, Grant Boggess, Robert Shapiro, Ruigang Yang, Brian Noehren

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

However, the ability of a single markerless camera system to quantify clinically relevant, lower extremity joint angles has not been studied in vivo. Therefore, the goal of this study was to compare in vivo joint angles calculated using a marker-based motion capture system and a Microsoft Kinect during a squat. Fifteen individuals participated in the study: 8 male, 7 female, height 1.702±0.089m, mass 67.9±10.4kg, age 24±4 years, BMI 23.4±2.2kg/m2. Marker trajectories and Kinect depth map data of the leg were collected while each subject performed a slow squat motion. Custom code was used to export virtual marker trajectories for the Kinect data. Each set of marker trajectories was utilized to calculate Cardan knee and hip angles. The patterns of motion were similar between systems with average absolute differences of <5 deg. Peak joint angles showed high between-trial reliability with ICC>0.9 for both systems. The peak angles calculated by the marker-based and Kinect systems were largely correlated (r>0.55). These results suggest the data from the Kinect can be post processed in way that it may be a feasible markerless motion capture system that can be used in the clinic.

Original languageEnglish
Pages (from-to)694-698
Number of pages5
JournalGait and Posture
Volume41
Issue number2
DOIs
StatePublished - 2015

Bibliographical note

Funding Information:
This work was funded by the Division of Information and Intelligent Systems of the National Science Foundation , grant 1231545 .

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

  • Hip and knee angles
  • Kinect
  • Markerless motion capture
  • Squat

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

Fingerprint

Dive into the research topics of 'The measurement of in vivo joint angles during a squat using a single camera markerless motion capture system as compared to a marker based system'. Together they form a unique fingerprint.

Cite this