Patient: I injured my right knee in sports 6 years ago, at that time it was swollen and painful and I didn’t dare to bend it, it got better after 3 months, and I was able to play sports without any problem, and I participated in sports games many times. I just can’t do strenuous change of direction movement. Yesterday, I had an MRI at the Weifang Medical College Hospital and the doctor said that the ACL is torn, so please tell me how to treat it now. I am afraid that the effect after surgery will not be as good as now. No treatment has been done. I would like to ask how to treat to my case? Is it possible without surgery? If surgery, is it better to go to my own ligament or artificial ligament? Doctor: The artificial ligament is not advocated for old losses, because the benefit of the artificial ligament is that it is repaired at the time of fresh injury, preserving the ruptured ligament stump, which allows the ruptured ligament to grow in adhesion to the artificial ligament, with both the toughness of the artificial ligament and the preservation of the ligament’s own proprioceptors, with ideal functional recovery. With old injuries, the ligament stump has been absorbed, so there is no advantage to using the artificial ligament again, but instead the disadvantages of the artificial ligament are exposed. If ligament reconstruction is not done, the knee joint is unstable and there is more chance of causing knee degeneration in the future, forcing total knee replacement surgery.