After the injury of medial collateral ligament of knee joint, if there is no early and active treatment, there may be the following sequelae: 1, pain in knee joint, due to the medial collateral ligament is not timely treatment, resulting in the ligament is not completely repaired, it can lead to pain in medial knee joint injury. 2, instability of knee joint, due to the loss of continuity of the knee joint, it can lead to the inward instability of the knee joint, and in the case of the knee joint externality Joint movement is significantly limited, and joint instability can occur.3. If surgery is performed for a medial collateral ligament injury of the knee, postoperative infections may occur after surgery, leading to delayed wound healing and limited joint movement.4. There can also be neurological complications, such as an injury to the saphenous nerve, which can lead to pain at the medial aspect of the injury after surgery. There can also be thrombosis of the lower limbs, which can lead to long-term swelling of the lower limbs.