After a knee ligament rupture, there is a noticeable loosening of the joint and unstable walking. After a cruciate ligament rupture, the lower leg feels thrown forward when walking, due to the loss of the normal pulling action of the ligament. If the lateral collateral ligament is damaged, it may cause the knee joint to be inward or abducted when walking, which requires surgical treatment. After the initial healing, the joint will be flexed and extended, and functional exercises will be performed to restore normalcy. If surgery is not performed, the knee joint will become loose and unstable, leading to joint degeneration, wear and tear of the cartilage in the joint, and the gradual formation of more osteophytes and calcifications, leading to narrowing of the joint space and more severe symptoms of pain and unfavorable movement.