What is the principle of a 3D gait analysis instrument?

The principle of a 3D gait analysis instrument is mainly based on the following core technologies:

Motion capture technology
By using multiple infrared cameras or structured light sensors, the system tracks the three-dimensional spatial positions of markers (reflective spheres or active light-emitting markers) attached to the human body. The system captures the motion trajectories of these markers in real time and calculates the 3D motion angles and displacements of various joints.

Inertial Measurement Unit (IMU) technology
By using sensors such as accelerometers, gyroscopes, and magnetometers, the system measures the acceleration, angular velocity, and orientation of different body parts, achieving dynamic three-dimensional motion capture of the human body. This is especially suitable for mobile environments without external cameras.

Force measurement technology
By using force platforms or pressure sensors, the system measures the pressure distribution on the soles of the feet and the ground reaction force during walking or standing, providing data for gait dynamics analysis.

Surface electromyography (EMG) technology
By detecting the electrical activity signals of muscles on the skin surface, this technology reflects the contraction state and coordination of muscles and assists in analyzing the muscle control mechanism during gait.

Data fusion and analysis technology
By synchronously collecting and integrating the data from the above multi-source sensors, the system uses algorithms to calculate key parameters such as joint angles, gait cycle, step length, and force distribution, and generates three-dimensional models and dynamic visualizations to support clinical and sports analysis.

The 3D gait analysis instrument uses multiple sensor technologies in combination to capture human motion and force information. Through data processing, it comprehensively presents the spatial and dynamic characteristics of human gait.