Most of the comminuted fracture of the left patella is caused by direct violence, which can be treated by holding the knee circle fixation method, revision method, patella grasping device fixation method and so on. 1. Holding the knee circle fixation method: you can use the lead wire to make a circle slightly larger than the patella, with the outside of the lead wire wrapped gauze bandage, and tied with 4 cloth tape, the length of the posterior lateral plate from the middle of the thigh to the middle of the calf, reset the external ointment to reduce swelling, and hold the knee circle for fixation, usually in about 4 weeks. 2. Repair method: the patient lies down, under aseptic operation, the hematoma between the joint cavity and fracture breaks is aspirated, and then injected with lidocaine solution for local anesthesia, and the patient pinches and squeezes the distal end of one hand with the thumb and the middle finger first to push it upward, and then fix it. The thumb and middle finger of the other hand squeeze the inner and outer corners of the upper edge of the proximal end and push downward, so that the proximal end of the fracture is aligned to the distal end. 3. Patella grasper fixation method: this method is suitable for closed patella fracture with separation and displacement, under aseptic operation, after anesthesia, the blood inside the knee will be pumped out, and then the double hooks with wide pitch of patella grasper will be grasped at the anterior edge of the upper pole of the patella, and the double hooks with narrow pitch will be grasped at the anterior edge of the lower pole of the patella, and then the pressurized screws can be tightened, and then the fracture can be repositioned on its own. It is recommended that patients go to regular hospitals, under the diagnosis of the doctor, according to the patient’s specific condition performance, to take targeted treatment, before the fracture is not healed, do not over bend the knee.