Thigh root ringing during leg extension is often caused by a tear in the glenoid labrum of the hip. A tear in the glenoid labrum of the hip can be caused by trauma, but the most common cause is thigh root ringing due to impingement syndrome, which is the popping of the glenoid labrum at the root of the thigh, due to congenital developmental abnormalities, such as thick development of the femoral neck, or significant developmental abnormalities of the acetabulum. In addition, it can also be seen in the elderly when the degeneration of the acetabulum bone spur, and the femoral neck after the impact can lead to the tearing of the glenoid lip, and the thigh root ringing and pain when extending the leg, and can be accompanied by the obvious restriction of hip joint movement when extending the leg. In this case, an X-ray of the hip joint and an MRI of the hip joint should be examined for diagnosis. If the condition is serious, surgery is also required.