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TWO-DIMENSIONAL VIDEO ANALYSIS IS COMPARABLE TO 3D MOTION CAPTURE IN LOWER EXTREMITY MOVEMENT ASSESSMENT
Stacy A Schurr1, Ashley N Marshall1, Jacob E Resch1
1Exercise and Sport Injury Laboratory, University of Virginia, Charlottesville, VA, USA.
International Journal of Sports Physical Therapy
|May 19, 2017
Summary
Two-dimensional (2D) video analysis offers a practical alternative to 3D motion capture for assessing lower extremity kinematics. This study found moderate to strong correlations in the sagittal plane, suggesting 2D analysis can pragmatically evaluate joint displacement and injury risk.
Area of Science:
- Biomechanics
- Movement Science
- Sports Medicine
Background:
- Three-dimensional (3D) motion capture is the gold standard for kinematic analysis.
- Two-dimensional (2D) video analysis presents a more accessible, cost-effective, and portable option for kinematic assessments, particularly in pre-participation screenings.
- Limited research has quantitatively compared lower extremity functional tasks between 2D and 3D analyses.
Purpose of the Study:
- To compare trunk and lower extremity kinematic measurements in the frontal and sagittal planes.
- To evaluate these measurements between concurrent 2D video camera and 3D motion capture analyses during a single-leg squat (SLS).
Main Methods:
- A descriptive laboratory study involving 26 healthy adults.
- Participants performed three single-leg squat trials on each limb.
- Kinematic data (joint displacement) of the trunk, hip, knee, and ankle were recorded simultaneously using 2D video cameras and a 3D motion capture system, compared to quiet standing.
Main Results:
- Moderate to strong correlations (r=0.51-0.93) were found between 2D and 3D measures in the sagittal plane for all joints.
- A poor correlation (r=0.308) was observed at the knee in the frontal plane.
- Bland-Altman analysis showed strong agreement in average mean differences for joint displacement in the sagittal plane and good agreement in the frontal plane between 2D and 3D methods.
Conclusions:
- 2D video analysis demonstrated moderate to strong relationships with 3D motion capture for sagittal plane kinematics.
- The observed average mean differences were comparable to the standard error of measurement for goniometry.
- 2D measurements offer a pragmatic approach for assessing gross sagittal plane joint displacement and potential lower extremity injury risk, despite limitations in precision and rotational capture.
