Fever after patella fracture surgery may be caused by postoperative hematoma absorption, internal fixation stimulation and other physiological factors, but also can not be excluded from the surgical site of infection, or secondary osteomyelitis, etc., to find out the cause of the disease and carry out treatment. Most of the patella fracture surgeries adopt incision and internal fixation, there may be a small amount of blood accumulation after the patella fracture surgery, and the process of hematoma resorption at the fracture site will cause fever. In addition, the need to implant internal fixation in the treatment of fracture, and the local blood circulation accelerated, will also cause the fracture site fever, this is a physiological phenomenon, appropriate treatment or temporary observation, will be gradually relieved. If the surgical site of patella fracture has persistent fever, accompanied by local redness, swelling and pain, or abnormal secretion, it may be a local infection or osteomyelitis, etc., and may be accompanied by generalized fever, and the symptoms are often more serious. This situation requires prompt treatment. After the occurrence of fever in the surgical site of patella fracture, we should actively exclude physiological factors, and timely treatment under the guidance of specialized doctors.