There is some controversy about when to do surgery after ACL rupture, but the overall principle is basically accepted by most scholars, and the general principles and precautions are as follows: I. Simple ACL rupture (that is, ACL rupture patients who do not combine other ligaments such as collateral ligaments and serious meniscal injuries): 1. It is recommended to wait for the acute trauma period to pass, that is, the swelling and pain basically disappears, and the joint range of motion is basically normal before surgery, the post-operative rehabilitation will be easier, and there will be no significant impact on the surgical effect, this time is usually 2-4 weeks after the injury, sometimes longer, then you can operate, as long as you do not play sports, daily life will not have too much impact, and delaying for a period of time will not have too much impact on the surgical effect. The delay will not have a great impact on the result of the surgery. If the injury is not the first time, the reaction of the joint will be much smaller, and the degree of limitation of joint movement and swelling may not be significant, and the principle is that the surgery can be performed after the basic recovery of joint function. Second, the anterior cruciate ligament rupture combined with medial collateral ligament rupture (the principle of lateral collateral ligament is similar) The treatment of this part of the patient is the most controversial, mainly based on the medial collateral ligament injury to determine. 1, if the rupture is more complete and serious, surgery is best performed within 2 weeks, because after 2 weeks due to tissue mechanization degeneration, the medial collateral ligament may not have the opportunity to operate, and the conservative effect of severe medial collateral ligament rupture may be discounted, so for this part of the patient will need to operate in the acute period after the injury, but the postoperative rehabilitation process may be relatively difficult, need to be mentally prepared, it is best to have 2, if the medial collateral ligament injury is not serious, the chances of conservative self-healing are great, then you can first brace straight leg fixation for 4-6 weeks, and then start joint mobility exercises after the medial collateral ligament is completely healed, and then the joint mobility is basically normal and the swelling and pain basically disappears, then you can operate, and then just simply rebuild the anterior cruciate ligament can be done. If a clear meniscus injury with a chance of suture can be determined on the preoperative MRI, relatively early surgery will help to improve the chance of meniscus healing, but unlike the medial collateral ligament, which is strictly operated within 2 weeks, only the amount of exercise and activity should be properly controlled before surgery to prevent further meniscus damage. The above principles are only general guidelines, and the specifics vary. After all, it is not easy to accurately determine the extent of the injury to individuals sometimes, and even doctors’ judgments are biased, so it is still advisable to visit a specialist promptly after a serious joint sprain to assess the injury. But we do not need to be too nervous and alarmed after learning that we have torn the anterior cruciate ligament, because the real need for surgery is still a minority, most cases can still wait until the joint reaction disappears before surgery, the intensity of activities in daily life is difficult to cause new damage in the short term, as long as you do not play sports first, and properly strengthen the muscle strength exercises before surgery, then delayed surgery for a period of time on the final Please relax and go about your life, work and study normally, and be well prepared mentally and physically, so that the post-operative effect can basically reach a more ideal level.