Not infrequently, Orthopaedic surgeons notice that fever following childrens femur fractures does not coincide with the laboratory findings. The authors agree that knowledge of the frequency, time of onset, duration, and magnitude would be helpful in accessing the significance of fever in the postinjury period. The authors reviewed 65 childrens femur fractures without infection under the 15 years old from March 1984 to December 1989 and following observations were made.