Knee sprains are very common in daily life and sports, accounting for more than half of all joint surgery visits, including ACL injuries, meniscal injuries and articular cartilage injuries. ACL rupture is a very serious knee sports injury. Once mishandled and delayed, it is highly disabling and leads to knee instability, secondary meniscal injury and articular cartilage degeneration. Therefore, there is a great need for timely knee cruciate ligament reconstruction. Most people will feel that ACL injuries are far away from them, thinking that they will not be as strenuous as the alien Rolaldo and Evergrande’s foreign aid Alan. Unbeknownst to me, non-contact injuries also include minor movements such as 30° of knee flexion, internal thigh rotation, and external calf rotation, which can also lead to ACL rupture. I had a patient who was a 16 year old 200 pound chubby girl. She described standing on a bus and braking sharply with her knee slightly flexed, which resulted in a ruptured ACL. The surgery went well and she recovered very well. More positively, she has also lost weight to 120 pounds in the past 1-2 years. I almost didn’t recognize her at the recent 6 month follow up visit. In my joint specialist clinic, I often encounter a very large number of patients with knee sprains. Some of them come to us promptly when they are injured and receive regular and effective treatment. We also provide hands-on rehabilitative training so that the patient can return to normal exercise and life as soon as possible. Some people will suffer from a fracture and think it is not necessary. The result is that the injury is not relieved, but the best time for treatment is missed. I will often cite NBA players Jeremy Lin had a torn meniscus, the Chinese Super League Evergrande Alan ruptured anterior cruciate ligament. Once they were injured, they all immediately received formal and timely consultation and treatment. Therefore, scientific, timely and effective assessment of knee sprains is necessary. Our knee joint is not only composed of bones, but also important structures such as the cruciate ligament, collateral ligament, meniscus, articular cartilage, synovium, and joint capsule. Early meniscal injuries can occur without severe pain symptoms and can be characterized by pain during activity or walking up and down stairs, joint popping, and joint interlocking. With a cruciate ligament injury, the patient can hear a muffled sound at the time of injury, and the knee joint swells rapidly and is painful. However, I also often find that some patients have slow swelling of the knee joint. After 1-2 weeks of rest, the swelling and pain can slowly resolve. But don’t think it’s healed. Because of the problems with joint stability, it often appears that the joint is unstable when hitting the weak leg, not daring to run or stop sharply, not being able to do running, and going up and down stairs quickly. I have many patients who have had ACL injuries for years before coming in. They come to my clinic because of long-term joint instability, secondary to meniscal tears and joint interlock, and they can’t fully straighten their knees anymore. So every time I tell people that long-term failure to obtain joint stability reconstruction will lead to serious secondary problems such as articular cartilage damage, degeneration, meniscal damage, osteophytes, and joint free body formation. Therefore, we, the doctors of joint surgery and sports medicine, really appeal to all of our friends: in the face of knee injuries, you should go to a specialist in time to clarify the structure and nature of the injury and get early and effective diagnosis and treatment. Early icing and limited movement of the knee joint is essential. In the later stage, functional exercises of the joint need to be actively rehabilitated under the patient guidance of a physician.