Partial tear of the medial collateral ligament is mainly caused by trauma, which can usually be treated by general treatment, plaster external fixation, medication and surgery. 1. General treatment: partial tear of medial collateral ligament belongs to second-degree tear, early need to limit the knee joint activities, within 72 hours of injury, you can apply ice to the affected area. 2. Plaster external fixation: plaster casts can be used in front of and behind the knee joint for fixation. Functional exercises such as leg lifting and ankle pumping can be used in the later stage. 3. Medication: anti-inflammatory and analgesic drugs such as Celecoxib and Meloxicam can be used. 4. Surgery: When the symptoms are severe or conservative treatment is ineffective, surgery may need to be considered. The above medications should be used under doctor’s supervision. When the medial collateral ligament is partially torn, it is recommended to seek prompt medical attention to avoid delay.