Patients with patellar fractures who have undergone surgical treatment can, in general, perform appropriate passive flexion and extension of the knee area on the second day after surgery, which can also play a role in functional exercise, but for some comminuted fractures, after surgery, it is not suitable for premature exercise. The patellar fracture is a common injury that causes swelling and pain in the patellar area, as well as limiting the function of the knee joint, which means that the knee joint cannot bend and straighten on its own, and is accompanied by bruising in the knee joint area. The most appropriate treatment for patellar fractures is surgical internal fixation, so that the patella will recover very well and the recovery time will be shortened. If the patellar fracture is well fixed, the flexion and extension of the joint should be performed as soon as possible, which will help prevent the formation of hematoma and prevent adhesions of the joint and muscle atrophy. Therefore, postoperative flexion training is still crucial, but of course it should be done only when the patella fracture is properly treated and the condition is stable, if the injury is serious, especially if it is a comminuted fracture, attention should be paid to automatic recovery, and only after the condition is stable should the patella be considered for exercise, and when training, passive training can be done first, and then active training. The imaging examination, etc.