The third degree injury of posterior horn of meniscus is possible to return to normal through standardized treatment. Posterior horn of meniscus third degree injury is a more serious injury, generally difficult to self-healing, conservative treatment is ineffective. Surgical treatment is recommended, such as partial meniscectomy, meniscal suture, etc., to maintain the function of the meniscus and joints. The most appropriate treatment plan is chosen according to the specific tear. The meniscus usually returns to normal in about three months after surgery. If there is particularly severe damage to the meniscus, or if the prognosis of the surgery is poor or secondary injury occurs, the outcome of the meniscus treatment may be affected. If there is a third-degree damage to the posterior horn of the meniscus, it is recommended to consult a doctor in time and improve the relevant examinations under the guidance of the doctor, so as to avoid delaying the best treatment period.