OBJECTIVE: To investigate the effects of ultrasound treatment on the healing of hip bone fractures using frequencies of 0.5 MHz and 1.5 MHz with constant intensity (30 mW/cm METHODS: For the ex vivo experiments, acoustic attenuations of 0.5 MHz and 1.5 MHz ultrasound were measured and compared using different thicknesses of human cadaver and porcine tissues in a hydrophone system. For the in vivo experiments, 20 hip-fractured rabbits were divided into four groups, namely: control, 1.5 MHz with unchangeable intensity (positive control), 0.5 MHz with changeable intensity, and 1.5 MHz with changeable intensity. For the 0.5 and 1.5 MHz groups with changeable intensity, a constant intensity of 30 mW/cm RESULTS: The effective intensity measured using a hydrophone was substantially reduced to 6.16 mW/cm CONCLUSION: The results suggest a LIPUS frequency of 0.5 MHz together with the consistent intensity of 30 mW/cm