Third degree meniscus injury, you can consider doing strictly conservative treatment first, but expectations should not be too high, because the injury pain is more serious, conservative treatment is difficult to achieve results, and eventually most of them may need surgery. During conservative treatment, it is necessary to strictly avoid weight bearing on the affected limb to avoid re-injury to the meniscus, microwave physiotherapy, blood circulation and blood stasis medication, and nutritional medication such as sodium vitreous acid injection within the joint cavity. After 4-6 weeks of strict conservative treatment with no effect, knee arthroscopy can be considered. With minimally invasive knee arthroscopy, the meniscus can be repaired first. If the injury is more severe and there is no way to repair it, meniscectomy can be performed. If the injury is more severe, the meniscus can only be removed eventually.