The meniscus of the knee is like the rubber cushion in the lid of a water glass, it has the function of cushioning and fixing the knee joint to some extent. It is a triangular-shaped piece of brittle tissue that can be damaged just by walking, and the damage is followed by pain, ranging from stabbing pain in mild cases to soreness and swelling and poor movement of the knee joint. Once a meniscal injury is diagnosed or considered, it is best to treat it as early as possible, including knee immobilization and minimally invasive arthroscopic surgery to examine and repair it. However, many people don’t notice it at first, so most people come in with old injuries, and most of them have to have the damaged meniscus removed. There are natural sequelae to the removal, including relative instability of the joint, but these vary from person to person and depending on the activity. However, within one week after the surgery, it is necessary to nurse the wound, so within 1 week or before the wound is healed, rest is the main focus, and the knee joint activities are based on daily life, not too much unnecessary activity, after 2 weeks, it is basically normal, but there will still be joint swelling and discomfort, which is normal. It is better not to re-traumatize, otherwise it is more likely to be damaged.