Symptoms of second-degree posterior meniscus injury mainly include obvious pain, knee joint swelling, knee joint inflexibility and so on. 1. Obvious pain: the second degree injury of posterior meniscus horn will stimulate the small nerves, and at the same time, local inflammatory edema, bruising and swelling, thus producing obvious pain, when twisting the body in a half-flexed position, it will further squeeze the posterior meniscus horn, and the pain will be aggravated. 2. Knee swelling: second degree injury to the posterior horn of the meniscus leads to small blood vessel rupture and bleeding, the accumulation of blood in the local swelling will be formed, and if the local inflammatory edema is aggravated, swelling will also occur. 3. Inflexible knee activities: after the second degree injury of posterior horn of meniscus, most of them will feel obvious pain during activities, which will affect the normal activities of knee joint. In addition, the pain will cause the leg muscles to relax and be weak, so some people will experience walking weakness. Some other symptoms may occur with second degree posterior horn meniscus injury, and it is recommended to actively consult the hospital for the above symptoms, cooperate with the doctor’s treatment, and have regular review. Avoid doing strenuous knee exercises during treatment, and avoid standing or walking for a long time.