The severity of a lateral meniscus injury is related to the degree of meniscus damage. Generally, injuries within the second degree are considered mild, while third degree injuries are more serious. Meniscus injury can be caused by trauma, if it is one degree, two degrees of injury, is a mild injury, can be through rest, joint plaster support, brace fixed treatment, most cases can recover. If it is a third-degree injury, it is more serious and more difficult to recover on its own, and can be treated by arthroscopic meniscus suture. Meniscus injury can also be caused by joint degeneration such as osteoarthritis, rheumatoid arthritis and other diseases. If the injury is mild and the pain is mild, symptoms can be improved by wearing a knee brace to reduce activity. If the third degree of injury may cause more obvious pain in the joints affecting daily life, conservative can choose to rest, hot compresses, massage and physical therapy, but also oral anti-inflammatory drugs anti-inflammatory pain, such as nimesulide, diclofenac sodium and so on. For severe pain can also be treated by arthroscopic meniscus trimming and molding. If symptoms of meniscus injury occur, it is recommended that patients go to the hospital to identify the cause and receive regular treatment.