In the case of meniscus injury to the posterior horn of the inner and outer sides of the meniscus, if the injury is only minor, the symptoms can be eliminated, but if it is a wide range of injuries, it is relatively difficult to recover. If the injury to the posterior horn of the meniscus is only minor and there is no large free body, it can be treated conservatively such as immobilization and braking; or the meniscus can be sutured through surgery and bed rest can be paid attention to, so that the meniscus will recover gradually. However, if there is extensive damage to the inner and outer posterior corners of the meniscus and a large number of free fragments exist in the joint cavity, the meniscus usually cannot be preserved and needs to be surgically removed, which is usually not easy to recover. The meniscus is a cartilaginous structure within the knee joint that serves to cushion intra-articular stress, stabilize the joint, and protect the cartilage. If damage occurs, patients can follow the doctor’s instructions to check the extent of meniscus damage through MRI. It is recommended that patients with injuries to the posterior horn of the inner and outer sides of the meniscus should seek medical attention in a timely manner and under the guidance of the doctor for targeted treatment to avoid delaying the condition and causing adverse consequences.