A comminuted knee fracture is usually curable. The kneecap, also known as the patella, is located in front of the knee joint. Knee comminuted fracture refers to the bone broken into three or more pieces, the cause of the disease is mostly direct or indirect violence injury, mostly in the old and frail people. Patients mainly show pain in the injured area, hematoma, ecchymosis or bleeding around the fracture, and limitation of movement of the affected limb. Most comminuted knee fractures require surgical treatment to maximize the recovery of knee function. Because the fracture end of a comminuted fracture will be displaced to some extent, surgery is required for reduction and internal fixation. Patients can choose wires for tension band fixation, patellar ring suture, wire or steel nail fixation and other methods for internal fixation. After surgery, patients should carry out gradual functional exercises under the guidance of the doctor to strengthen the leg muscles and do more leg massage, as well as to improve the range of motion of the knee and reduce stiffness. Normal activities can be resumed in about 2 to 3 months, and the internal fixation can be removed after one year when the fracture has healed well. It is recommended that patients with comminuted knee fracture should go to the hospital in time for follow-up treatment under the guidance of the doctor.