It is not normal for a patella fracture to not reduce swelling in the knee after 80 days of rehab. The patient may have peripatellar soft tissue adhesion, local inflammatory reaction, and poor fracture healing. In the process of rehabilitation training activities, due to the stimulation of local tissues caused by inflammatory reaction, thus appearing the symptoms of knee swelling. Patients should pay attention to the correct method of rehabilitation training, step by step, the training intensity should not be too large. If the degree of patellar fracture is mild, the swelling will subside in about 6 weeks with conservative treatment. If the degree of fracture displacement is heavy and the postoperative functional exercise is not timely, the swelling will take longer to subside. The swelling of the knee after rehabilitation can be improved by medication, elevation of the affected limb, and treatment modalities such as post-exercise ice packs, pre-exercise heat packs, and wax therapy. If the swelling of the knee does not subside for a long time after the patient reduces the intensity of training, it is recommended that the patient consult a doctor in time, under the guidance of a professional doctor for treatment, do not blindly self-medication to avoid adverse consequences.