In this case, it is best to go to the orthopedic department of the hospital and have the doctor perform a physical examination to look at the specific area of the knee injury. If available, it is best to have an MRI of the knee for a clearer and more definitive examination. If the injury is purely to the skin and subcutaneous fatty fascia layer, bed rest can be taken to avoid activities, and oral anti-inflammatory and pain-relieving drugs can be taken to relieve the symptoms significantly. If there is a fracture of the patella and other locations, treatment by surgical incision and internal fixation is required. If there is a meniscal injury, it needs to be fixed in a cast for about one month and then removed. If there is a tender leg and interlocking joints, arthrofibroscopy, also known as minimally invasive surgery, should be performed to repair the meniscus. If there is a severe injury to the cruciate ligament, reconstruction of the cruciate ligament is required.