There is no so-called best treatment for posterior horn of meniscus third degree injury, clinically it can take physical therapy, drug therapy and surgical treatment, etc. The treatment plan is judged according to the specific conditions of meniscus injury. 1. Physical therapy: It is recommended to use physical methods such as ultra-short wave and intermediate frequency electricity to promote tissue recovery and improve blood circulation. Usually, you can wear a brace to immobilize the knee joint to avoid aggravation of the injury. 2. Medication: It is recommended to use anti-inflammatory and analgesic drugs, such as celecoxib and ibuprofen, to reduce joint pain; and to use cartilage-nourishing drugs, such as glucosamine sulfate and glucosamine hydrochloride, to promote meniscus recovery. The drugs should be used according to the doctor’s prescription. 3. Surgery: It is difficult to recover from third degree meniscus injury on its own. It is recommended to carry out surgery according to the patient’s condition, such as meniscectomy, meniscus suture, etc., to restore the integrity of the posterior horn of the meniscus and to avoid secondary damage to the articular cartilage and other tissues. In daily life, patients with third degree meniscus injury should pay attention to avoiding the use of the knee joint as much as possible. If there is a third degree injury of posterior horn of meniscus, it is recommended to consult a doctor in time, under the guidance of the doctor, according to the examination results of personalized and standardized treatment.