Unstable meniscus injuries should be operated on as early as possible. If surgery is late there will be the following problems: 1. The tear will increase, resulting in more meniscus being removed in future surgeries, and the more meniscus removed, the greater the postoperative impact on the knee joint. The more meniscus is removed, the more post-operative impact it will have on the knee. 2. With an acute meniscus injury, there is an opportunity for suture repair, and the suture can still heal and will be similar to an uninjured meniscus. Postponing the surgery will make the suture opportunity lost. 3. Even if the meniscus is completely removed, it will cause less wear and tear to the joint than a torn meniscus in the joint. In order to prevent accelerated degeneration of the knee joint, early surgery should be performed. 4, Early surgery can resume all activities such as life, work, sports or normal training for athletes as soon as possible.