Secondary injuries of the medial collateral ligament are usually treated conservatively, while surgery is needed when symptoms are obvious or the injury affects joint movement. Secondary injury of the medial collateral ligament is usually treated conservatively, mainly through knee braking, resting, or wearing a knee brace. If the injury causes obvious knee pain and swelling symptoms, oral pain relief and swelling medication can be taken, such as oral acetaminophen or bisacodyl capsules for pain relief, oral sodium heptadecyl saponin to reduce swelling and other treatments. If the secondary injury of the medial collateral ligament affects the knee movement, such as medial laxity and knee instability, surgical treatment is needed according to the instability of the knee to avoid further ligament damage and cartilage damage caused by instability. Surgical procedures include medial collateral ligament repair and medial collateral ligament crumpling. Medial collateral ligament secondary injury medication needs to be used under the guidance of a doctor.