It is important to collect basic data for which evaluates bone fracture healing on the living body. Evaluation of healing using pseudo-bone fracture model was examined by impact testing. The specimen was excited by an impulse hammer. Both the excitation signal of the impulse hammer and the response signal of the accelerometer were transmitted to FFT (Fast Fourier Transform) analyzer. The natural frequency was obtained by transfer function of the ratio of excitation and response signal. In this study, a pig's femur was substituted for a human bone and the natural frequency was measured. Furthermore, the states of bone fracture or bone fracture healing were imitated by using a pig's femur which cut deeply from the end or cut deeply from the outside diameter. This study examined how the specimen's natural frequency varied depending on the defects of pig femur. As a result, it was clarified the possibility that could evaluate bone fracture healing by measuring the natural frequency of bone.
