Knee rattling can be caused by physiological normal phenomena as well as by pathological factors, physiological factors such as popping or rattling do not have a substantial effect on the knee joint, while pathological factors already have a disease basis. Frequent rattling is abnormal, and too much rattling can cause more damage to the knee. Physiological rattling is in the knee joint activities, due to the position of the joint, ligament, meniscus movement and impact, friction, resulting in rattling, episodic, not accompanied by pain and dysfunction, generally physiological rattling or rattling. If the knee joint has a pathological basis, such as hyperplasia, hypertrophy, heterotopic ossification, inflammatory reaction of the soft tissues around the knee joint, hyperplasia, degeneration, deformation of the knee joint bone, meniscus damage, etc., it will cause a ringing sound accompanied by pain and dysfunction during activities, and this is often frequent, and the frequent ringing sound will surely exacerbate the pathological changes of the knee joint and lead to aggravation of the injury of the knee joint. The situation.