Third-degree meniscus injuries must be treated surgically. For severe types of meniscal injuries, clinically called 3rd degree meniscal injuries, often indicate that the meniscus has been damaged in form and structure, i.e., the meniscus is usually said to have broken down. For this kind of broken meniscus, in the past, only the broken meniscus can be cut off, but with the improvement of medical technology, and the current improvement and popularity of minimally invasive arthroscopic technology, more and more meniscus is saved by surgeons, called meniscal suture surgery, to suture the meniscus that can be sutured as much as possible to preserve the normal function of the meniscus, so patients with third-degree injury are recommended to be definitely treated surgically. The surgeon will make the best surgical plan according to the situation to preserve more of the meniscus and allow better function of the joint.