I am often asked by patients if they need surgery for meniscus damage. Is it possible without surgery? Do I need surgery for a moderate meniscus injury? Do you need surgery for a 2nd degree meniscus injury? Here, I make a summary of what meniscus injury requires surgery. First, meniscus injury, the need for surgical treatment of the situation, the most important thing is the patient’s symptoms. In general, if the meniscus injury, the following three conditions, it is recommended that surgery as soon as possible: 1, the knee joint interlocked or Canton. For example, walking or running suddenly found the knee joint stuck, can not straighten or bend down, this situation, is the knee joint interlocked, it is recommended arthroscopic surgery treatment. 2, the knee joint hit soft leg. For example, going up and down the stairs or walking, often sudden knee weakness, feeling a soft knee, although a moment will recover. However, when this occurs, arthroscopic surgery is also recommended. 3. Painful popping of the knee joint. For example, when walking, going up and down stairs, or squatting or flexing the knee, the knee joint pops with significant pain, and the pain disappears after an angle. This condition also requires arthroscopic surgery. In this case, it should be distinguished from physiologic rattling, which is only rattling and not painful. Secondly, whether or not a meniscal injury requires surgery depends on the physical signs, that is, the physical examination by the doctor. There are many physical examinations of the knee, for meniscal injury, the most important is the following 2 examinations: 1, knee pain consultation, the doctor’s physical examination, for physical examination, the most important, I think, is the pressure pain of the knee joint. If the pressure pain in the medial and lateral joint lines of the knee is obvious, excluding ligament damage and osteoarthritis, then it means that the meniscal damage is more obvious. 2. McSign: It is also a physical examination by the doctor. However, many acute injuries, the patient is unable to make this examination due to obvious pain. Third, auxiliary examination, the most important auxiliary examination is the MRI of the knee, but the MRI is always just a reference, the most important thing is to combine with the symptoms and signs. Combined with the auxiliary examinations, the indications for arthroscopic surgery are as follows: 1. For acute injuries, physical examination with obvious or mild symptoms and MRI showing 3rd degree signal, arthroscopic surgery is recommended as soon as possible. 2, for acute injury, physical examination has obvious symptoms or mild symptoms, magnetic resonance shows 1-2 degree signal, it is recommended to first conservative treatment, can wear a brace for more than one month, after one month to start appropriate weight-bearing activities, restrict activities for three months, three months to avoid sports. If the patient recovers after three months, surgery is not necessary. If the symptoms persist after three months, arthroscopic surgery may be performed. 3.For pain caused by no obvious cause or chronic strain, there are obvious or mild symptoms on physical examination, and MRI shows 3rd degree signal, which is consistent with physical examination. Arthroscopic surgery can be performed as soon as possible. Magnetic resonance shows 1-2 degree signal, and the symptoms last for more than 3 months, arthroscopic surgery is feasible. 4. For no symptoms or discomfort, no symptoms on physical examination, and MRI showing signals of random degrees, all should be treated conservatively. Symptoms and signs are always the first priority. Rest and braking should be done, and exercise should be avoided for three months.