Theoretically, meniscal tears less than 3 MM can be treated without surgery. Conservative treatment can also improve clinical symptoms: 1. Acute phase: after acute injury there is usually pain and mild swelling, if there is no strangulation, you can use cotton splints to fix for 2-3 weeks, take non-steroidal anti-inflammatory drugs, strengthen the quadriceps strength training. If symptoms are not present, conservative treatment and rehabilitation can be continued and training competition can be gradually resumed. If swelling and pain occur repeatedly or if symptoms of strangulation still exist after the injury, arthroscopic surgery is generally considered. 2, chronic phase: old injury if the symptoms are not obvious can be training competition, but if engaged in sports need to do more twisting movements, should consider early surgery to avoid aggravating the injury, or even cause serious wear and tear of the cartilage. Typical symptoms should be early surgery.