Centroid position estimating method for observational analysis

Area of Science:

• Biomechanics
• Kinesiology
• Clinical Observation Methods

Background:

• Accurate assessment of the center of mass (COM) is crucial in biomechanics and clinical settings.
• Traditional methods for COM determination can be complex and require specialized equipment.
• Developing a visually-based clinical method could simplify COM assessment.

Purpose of the Study:

• To develop a practical clinical observation method for evaluating the human body's center of mass.
• To simplify COM estimation by dividing the body into upper and lower mass segments.
• To identify optimal landmark combinations for macroscopic COM assessment.

Main Methods:

• Twenty healthy males performed various movements (bending, squatting, walking).
• Three-dimensional coordinates were analyzed using a conventional model.
• Virtual markers defined upper and lower body masses; their midpoints calculated COM, compared against a conventional model, with the lowest error combination identified.

Main Results:

• The optimal combination for estimating COM involved the Th8 vertebra and the midpoint between hip and knee centers.
• This method achieved an average error magnitude of approximately 30mm.
• The identified method was deemed clinically beneficial for macroscopic evaluation.

Conclusions:

• A simplified clinical method for estimating the center of mass is feasible using specific anatomical landmarks.
• The proposed method offers a practical approach for macroscopic COM assessment in clinical settings.
• The observed error margin is acceptable for clinical utility.