In most cases, a broken ligament in the lower extremity can be restored to normal, provided that the injury is treated properly and early. The ligaments of the lower extremity are very important for the stability of the joints in the lower extremity and for the muscle strength of the lower extremity. The lower extremity is responsible for the uprightness and walking of the human body, and once the ligaments of the lower extremity are ruptured, they need to be treated promptly to restore the function of the lower extremity and to avoid residual effects as much as possible. There are many treatments available for this type of injury, and the technology is very mature, and the prognosis for the majority of patients is very good. There are often severe injuries that can leave a legacy of decreased motion. Injuries to the Achilles tendon or cruciate ligament may result in a degree of decreased athletic ability that can ensure a normal life for the patient afterwards. Patients suffering from such injuries should actively cooperate with their doctors to do relevant and proper treatment early.