Meniscus injury is an extremely common behavioural injury in life, young people play basketball, soccer, high jump, these sports, if the body is not balanced slightly, resulting in an imbalance of the body’s center of gravity and fall will be meniscus injury, and is engaged in some heavy physical work workers, is also very easy to cause meniscus injury, so meniscus injury should be how to deal with it, this needs to be correctly It is important to treat this injury correctly, not to overstate the injury, and not to take it lightly. The knee joint is the largest joint in the human body, consisting of the lower end of the femur, the upper end of the tibia and the patella (kneecap) in front of the joint capsule; between the knee surfaces there are “spacers” made of fibrocartilage; these two “spacers” are crescent-shaped, one on each side, just like the kneecap. These two “spacers” are crescent-shaped, one on each side, like parentheses, and are fixed to the tibial plateau and to the joint capsule and surrounding tendons and ligaments, and can move slightly forward and backward or in and out with the movement of the knee; the crescent-shaped “spacers” are called menisci. The medial meniscus is thicker on the outer edge and thinner on the inner edge, with a “C” shape; the lateral meniscus is slightly smaller than the medial, but fuller, with an “O” shape; the meniscus has the function of absorbing shock, buffering pressure, enhancing knee stability, preventing knee injury, and delaying knee aging. The meniscus has the ability to absorb shock, cushion pressure, enhance knee stability, prevent knee injury, and delay knee aging. Meniscal injury symptoms: Most have a history of significant trauma. In the acute phase, there is significant pain, swelling, and fluid accumulation in the knee joint, as well as impaired joint flexion and extension. After the acute phase, the swelling and effusion may subside on their own, but there is still pain in the joint when moving, especially when going up and down stairs, going up and down slopes, squatting and standing, running and jumping, etc. In severe cases, limping or flexion and extension dysfunction may occur, and some patients have interlocking phenomena or popping when flexing and extending the knee. Examination of meniscal injuries X-ray radiography: The purpose of radiography is not to diagnose meniscal tears, but to exclude osteochondral free bodies, exfoliative osteochondritis and other knee disorders that may be similar to meniscal tears; MRI: It is by far the imaging tool with the highest positive sensitivity and accuracy in diagnosing meniscal injuries, cruciate ligament rupture, etc., with an accuracy rate of 98%; arthroscopy. Arthroscopic techniques have been recognized as the most ideal means of diagnosis and surgical management of meniscal injuries. However, arthroscopy should not be a routine means of examining meniscal tears. Only after the initial clinical diagnosis of a meniscal tear has been made, arthroscopy should be used to confirm the diagnosis and concurrently perform arthroscopic surgical management. Only then can its superiority be demonstrated. Treatment of meniscus injury 1, unlocking: when the patient has interlocking, should be unlocked by early manipulation, that is, using mild external rotation plus rotation of the knee joint, often can be unlocked, if the manipulation is ineffective, apply small weight skin traction or sock traction, when the muscle spasm is relieved, the pain decreases, a little activity of the affected knee, most can be unlocked by themselves. 2. Braking rehabilitation: For meniscus edge tears, apply a long-leg cast or knee immobilizer to fix the knee in extension for 4-6 weeks. During the fixation period, the patient is advised to do more quadriceps exercises to help the patient recover and promote the absorption of joint effusion. 3.Meniscal repair: It is suitable for those who have tears within 5mm of the meniscus surrounding the attachment, with the anterior and posterior angles intact, and most preferably for those who have acute marginal meniscal tears combined with anterior cruciate ligament rupture. The sutures are vertical decubitus, vertical layered, horizontal decubitus, knotted, etc. 4.Partial meniscectomy: It is applied to barrel stem rupture, longitudinal rupture or transverse rupture. Only the central part of the tear is removed, leaving a more stable surrounding meniscus sleeve or edge, which plays an obvious stabilizing role for the tibiofemoral joint. If the central part of the meniscus ruptures into the intercondylar fossa, the connection between the central part and the surrounding part in front is firstly severed transversely, then the front of the central part is clamped and pulled towards the intercondylar fossa, and the connection between the central part and the posterior corner of the meniscus is severed under direct vision. 5.Total meniscectomy: In view of the very important function of meniscus, try not to remove meniscus completely, because its effect after complete removal is often satisfactory in the early stage, and the satisfaction rate gradually decreases after several years due to degenerative joint disease, instability of knee joint and chronic bursitis. Complete meniscectomy is only indicated in cases of severe injury to the parenchyma of the meniscus that cannot be healed and whose fragmentation is severe enough to cause serious functional disorders of the knee.