Posterior horn tear of medial meniscus with second degree injury can be treated conservatively or surgically. 1. Conservative treatment: Usually, the second-degree injury of posterior horn tear of medial meniscus can be treated conservatively, pay attention to the protection of meniscus, avoid trauma, acute injury can be iced, take non-steroidal drugs, such as diclofenac sodium for anti-inflammatory pain, but also can be appropriate pressure bandage. 2. Surgical treatment: if the patient after conservative treatment is ineffective, the symptoms did not improve, can be surgical treatment, usually through the arthroscope for meniscus repair, can also achieve good results. Medial meniscus posterior horn tear and second-degree injury should be timely consultation, by the doctor to choose the appropriate treatment, to actively cooperate with the doctor for treatment, regular review, the patient usually pay attention to develop good habits, pay attention to meniscus protection.