The rivets used for ACL reconstruction are usually not loosened because the patient will not be subjected to strenuous exercise after the surgery and the surgical site will be externally immobilized to avoid stretching of the tendons at the surgical site. 1. The rivets are tightly connected: the ACL reconstruction will connect the patient’s ruptured or torn ACL with rivets, and at the same time, the torn ligament will also be fixed on top of the tibia, so the rivets will not come off if the patient does not suffer from secondary injuries or undergoes strenuous exercise. 2. The external fixation of the patient’s surgical site will play a protective role for the surgical site: patients need to wear a professional brace or receive plaster external fixation after the Achilles ligament surgery, so the surgical site generally will not occur large displacement and tension, so the patient’s surgical site rivets usually will not come loose. It is recommended that the patient under the guidance of the doctor to standardize the rehabilitation training, to speed up the healing of the injury, and at the same time to avoid re-tearing of the surgical site.