Concurrent and Angle-Trajectory Validity and Intra-Trial Reliability of a Novel Multi-View Image-Based Motion...

Area of Science:

• Biomechanics
• Sports Science
• Motion Analysis

Background:

• Lower extremity injuries are prevalent in sports.
• Accurate joint kinematics measurement is crucial for performance analysis and injury prevention.
• Existing marker-based systems have limitations in certain environments.

Purpose of the Study:

• To validate a novel marker-less, multi-view image-based motion analysis system.
• To assess concurrent validity, angle-trajectory validity, and intra-trial reliability.
• To evaluate the system's utility in lower extremity tasks.

Main Methods:

• Ten healthy young men performed lower extremity tasks (sitting, standing, squatting).
• Joint angles were measured using the novel marker-less system and a marker-based Vicon system.
• Intraclass correlation coefficient (ICC) analyses were performed.

Main Results:

• High concurrent validity for hip and knee flexion (ICC3, k = 0.747–0.936).
• Excellent angle-trajectory validity (ICC3, 1 = 0.859–0.998).
• Excellent intra-trial reliability (ICC3, 1 = 0.773–0.974).

Conclusions:

• The novel marker-less motion analysis system is accurate and reliable.
• It is suitable for measuring lower extremity joint kinematics.
• Potential applications include sports performance monitoring and rehabilitation.