Wearable Motion Capture System Evaluation for Biomechanical Studies for Hip Joints

Area of Science:

• Biomechanics
• Human Motion Analysis
• Wearable Technology

Background:

• Clinical motion capture (MOCAP) systems are essential for joint load determination but are expensive and require significant infrastructure.
• There is a growing demand for more accessible and cost-effective MOCAP technologies in biomechanics research and clinical applications.

Purpose of the Study:

• To evaluate the compatibility and accuracy of a novel markerless wearable MOCAP system with biomechanical modeling software.
• To compare the performance of the wearable MOCAP system against a medical-grade optoelectronic MOCAP system for hip joint range of motion (ROM) analysis.

Main Methods:

• In vitro and in vivo experiments were conducted to quantify hip joint ROM, specifically abduction/adduction, flexion/extension, and internal/external rotation.
• Data were collected simultaneously from 14 healthy volunteers using both the novel wearable system and a gold-standard optoelectronic MOCAP system.
• Root-mean-square error (RMSE) and Bland-Altman plots were used to assess the agreement between the two systems.

Main Results:

• The in vitro RMSE for hip abduction/adduction was comparable between the wearable system (0.11 deg) and the optoelectronic system (0.09 deg).
• In vivo Bland-Altman analysis indicated that the data from the wearable system are comparable to the optoelectronic system.
• The biomechanical simulation software demonstrated compatibility for offline simulations with the wearable system's data.

Conclusions:

• The novel markerless wearable MOCAP system is a viable and accurate alternative to traditional systems for biomechanical analysis.
• The system's compatibility with simulation software allows for kinetic simulations, expanding its utility in the field of biomechanics.
• This wearable technology presents a promising, more accessible solution for human motion capture and analysis.