ACL reconstruction surgery is a minimally invasive procedure performed under arthroscopy. The procedure is complex and can be divided into the following five steps: The first step is arthroscopic exploration. A small incision is made in the patient’s skin and an arthroscope is inserted through the incision into the joint. The tip of the arthroscope is equipped with a lens that shows the inside of the joint on a monitor. The ACL reconstruction procedure involves looking at the ligament damage and whether there is any combined meniscal or cartilage damage. In the second step, the tendon is taken. An incision of about 2-3 centimeters is made in the leg, and through this small incision, the patient’s own N-cord tendon is removed and placed on a special table for processing; step 3, the bone tract is created. Through the arthroscope, the tibial and femoral bone channels are created at the upper and lower ends of the ACL, which is commonly referred to as a tunnel drilled into the joint between the ligament and the bone for the graft. Fifth, fixation. The transposed N-tendon is fixed at the upper and lower stops, allowing it to re-connect the “thigh bone” to the “calf bone”. When the fixation is complete, the wound is closed and the patient is returned to the ward in a brace splint. ACL reconstruction surgery under arthroscopy is less invasive and usually takes 2-3 hours, or 1 hour for an experienced surgeon, and only requires 2-3 days of post-operative hospitalization. Therefore, it is not considered a major surgery. In addition, the procedure does not require general anesthesia, only lower back anesthesia or epidural anesthesia, and the patient is awake during the operation, and even some bold patients can see the intraoperative situation through the monitor. So, with ACL reconstruction surgery, can patients return to their pre-injury condition? In fact, a complete return to pre-injury status is not possible. For example, if the patient’s athletic ability was 100 points before the injury and 50-60 points after the injury, then the patient may be able to reach 80 points after the surgery, which is sufficient for the average person to participate in recreational sports; even some patients (such as athletes, etc.) have very good post-operative rehabilitation and can fully recover to 90-95 points, so even if they participate in competitive sports, it is not too much of a problem.