[The effects of frequency of mechanical vibration on experimental fracture healing]

Mechanical vibration was performed with 5 different frequencies after radius fracture of 76 rabbits. The vibration effects were evaluate by means of X-ray film and bio-mechanical and pathological examinations. Our results suggests: (1) Vibration promotes the fracture healing in rabbits regardless of the frequency. Both bone strength and speed of fracture healing are better than those of the controls. (2) Bone strength is elevated by 20% approximately 30% by the best stimulation of stress. (3) The best frequencies are 25Hz and 50Hz, second best, 12.5 and 100Hz and then, 200Hz.