Knee ligament laxity can lead to poor knee stability, and the clinical symptoms can be divided into the following according to the length of time it takes to develop: 1. In the early stages, the knee joint will only feel unstable when there is strenuous movement of the knee joint, and there is a sense of misalignment when doing certain movements. In the late stage, there will be obvious osteophytes and osteoarthritis in the knee joint, such as pain in the knee joint when going up and down the stairs, and even in severe cases, the knee joint gap disappears and there is no way to carry out daily life. So there is knee ligament injury should be treated early, to reach the late stage of pathological changes throughout the disease lesions are irreversible, can only do the knee joint surface replacement surgery to improve the symptoms.