ACL reconstruction is a minimally invasive procedure performed arthroscopically and carries a low risk of complications. The two most common serious complications are: infection and re-rupture. The international literature reports a 0.6% incidence of infection after ACL reconstruction. Patients should not be overly concerned if an infection develops after surgery, because if the infection is diagnosed and managed promptly, the function of the knee is not greatly affected. In other words, if the infection is treated promptly and appropriately, it will not have a detrimental effect on the outcome of the surgery. Re-rupture of the ligaments after surgery usually occurs in patients who have undergone rehabilitation too early. In addition, patients are generally advised to start physical activity 1-2 years after surgery, which may also lead to re-rupture of the ligament if started too early. If the ligament is re-ruptured, a further ACL reconstruction needs to be considered and a specialist needs to be consulted for the specific treatment. In addition to infection and ligament re-rupture, many patients are concerned about whether the substance holding the ligament in place needs to be removed. The material that usually fixes the ligament at the upper stop is a steel plate, which is very small, about a few millimeters, equivalent to 1/3-1/2 of the nail cap of one’s little finger. this plate is made of titanium alloy and is not harmful to the body, therefore, it is generally not recommended to remove it. The fixation material commonly used at the lower stop is absorbable and, therefore, does not need to be removed either. Some patients also need to add metal portal nails for reasons such as bone or tendon, and these portal nails basically do not need to be removed. If they are to be removed, it is recommended that they be removed 2-4 years after surgery. TIPS: When flying through security, titanium plates do not make a loud noise; absorbable materials also do not cause an impact; ordinary metal portal nails may make a sound when passing through security. Therefore, these patients need to bring a certificate of diagnosis from the hospital to go through the security check.