Squatting down and getting up with creaky knees may be caused by physiological reasons, such as physiological popping and laxity of joint ligaments, etc., and may also be caused by pathological factors such as meniscus injury of the knee, osteoarthritis of the knee, etc.. 1. Physiological causes (1) Physiological popping: If you repeat a movement or maintain a posture for a long time, a sudden change in posture will easily lead to friction between the articular cartilage and synovial membrane, which will result in a popping sound. (2) joint ligament laxity: some people’s knee joint ligaments are relatively loose, poor stability, in the joint activity amplitude is larger due to the joint surface between the wrong movement, it is easier to ringing, so there will be squatting down to get up the knee creaking performance. 2. Pathological causes (1) Knee meniscus injury: if the knee meniscus is damaged, the meniscus will be squeezed during the activity, so there will be a ringing sound, and usually there will be pain symptoms. (2) Osteoarthritis of the knee joint: If there is osteoarthritis of the knee joint, when you are moving around, due to the friction between the articular cartilage and the lower bone, a rattling sound will occur, and usually there is also pain. Squatting down to get up the knee creaking if accompanied by other abnormal symptoms, it is recommended to actively go to the regular hospital for relevant examinations, to clarify the specific causes, and then according to the situation to deal with, so as not to delay the condition.