There are several possible mechanisms for bone ringing during the deep squat: first, some physiological popping. These are often found in the knee, hip, ankle, and small joints of the spine. The reason is that when squatting, such movements lead to pressure changes inside the above-mentioned joints, and when there is a sudden shift in pressure, there may be some ringing. However, this condition is physiological, so there is no local pain or restriction of movement after the noise. Second, there is a joint-related disease. For example, there may be osteoarthritis of the hip joint or damage to the meniscus, cartilage and ligaments of the knee joint. If you have these diseases, you may have a sound caused by the damage inside the joint when you do squats. Thirdly, the tendon slides, which causes the tendon to slide over the bony prominence or through the narrow tendon sheath, causing a string-like fluctuation and then a strange sound.