In clinical practice, if a patient has medial knee tendon pain, it means that the medial collateral ligament of the knee joint has been injured by direct or indirect external force, which will cause pain to the patient. If the injury to the medial collateral ligament of the knee is mild, the patient can be treated conservatively by immobilizing the knee in the straight position and applying topical gold ointment or topical furosemide ointment to the medial side of the knee for pain relief. Infrared therapy, medium frequency electrotherapy, or oral medication for bruises can be administered, such as Danshen tablets, Daxuodan and Bone Injury Spirit. If there is a complete rupture of the medial collateral ligament of the knee joint, which affects the normal movement of the knee joint and loosens the knee joint. In the treatment, we have to take surgical treatment, under epidural anesthesia for incision and exploration, and do repair of the medial collateral ligament at the same time.