Validity and reliability of Kinect skeleton for measuring shoulder joint angles: a feasibility study.

Area of Science:

• Rehabilitation technology
• Biomechanics
• Medical imaging

Background:

• Virtual rehabilitation leverages technology for remote patient care.
• Accurate measurement of joint angles is crucial for effective rehabilitation.
• The Microsoft Kinect offers a potential low-cost solution for motion capture.

Purpose of the Study:

• To evaluate the reliability and validity of the Microsoft Kinect for measuring shoulder joint angles.
• To assess the Kinect's suitability for virtual rehabilitation applications.

Main Methods:

• A feasibility study involving 10 healthy adults.
• Comparison of Kinect measurements against a 3D motion analysis system and a clinical goniometer.
• Assessment of shoulder joint angles in static poses from frontal and sagittal views.

Main Results:

• The Kinect demonstrated high test-retest reliability (ICC 0.76-0.98) for shoulder angle measurements from the frontal view.
• However, the 95% limits of agreement exceeded ±5° compared to standard methods across all poses and views, indicating potential accuracy issues.

Conclusions:

• The Microsoft Kinect shows good reliability for shoulder angle measurement.
• Significant accuracy limitations exist, necessitating caution before widespread adoption in virtual rehabilitation.
• Further research is needed to understand and mitigate precision and accuracy deficits for clinical applications.