The patella is larger than before after patellofemoral surgery may be caused by fracture healing, subsiding edema, muscle atrophy and so on. 1. Fracture healing: patellar surgery is usually often applied with patellar fracture osteotomy and internal fixation, and the broken patella is fixed with Kirschner’s pin or patellar claw. In the process of fracture healing, there will be new bone crust and blood vessel formation around the broken end, through the knee X-ray you can see a fuzzy white shadow along the patella around the broken end, which is a normal performance in the process of fracture healing. 2. Edema subside, muscle atrophy: after patella injury, there will be edema around the patella, and it takes a period of time for the edema to subside after surgery; in addition, patients need to brake for a period of time after surgery, and there may be muscle atrophy around the knee, and it will also feel that the patella is bigger than before after surgery. There may be other reasons why the patella is bigger than before, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.