Study of Knee Joints with Spectral Analysis

This research focuses on the explanation of the knee dynamics using the technique of spectral analysis. To understand the knee dynamics, a force plate, a stethoscope and an electromyography (EMG) are used which collects the data from the knee while performing different exercises at different rates. The data obtained is the measurement of the ground reaction force and torque from the feet, vibration of the knee joint, and electrical activity of the leg muscles. Thus obtained data is then used for analysis mainly using the idea of Fourier spectrum and transfer function. By observing the peak of the activity frequency, harmonics at the multiples of the activity frequency, and analyzing the transfer functions of the force and EMG signals in addition to acoustic signals, the knee dynamics can be understood. The analysis also allows for the detection of knee problems such as arthritis, injury, etc. to also be done. In future, we are planning to add accelerometer and goniometer for a better understanding of the knee dynamics.