The posterior horn of the meniscus is only about one-third of the way to the outer side. If the middle or inner layer is injured, it is not easy to heal; however, if only the outer layer is injured, it is possible to heal. The blood supply to the meniscus is only present in the outer third of the meniscus. Usually, a tear of the posterior horn of the meniscus involves the inner, middle, and outer portions of the meniscus. Due to the poor blood supply and healing ability of the middle and inner layers, it is usually difficult to heal on its own because the stability of the meniscus can only be restored by scarring the fibrous connections. However, if the tear in the posterior horn of the meniscus only involves the outer third of the outer meniscus, it is possible to heal due to the better blood supply here. It is recommended that patients with posterior meniscus horn tears should seek timely medical attention and actively cooperate with their doctors for examination and treatment, so as to make a good recovery.