Abstract
Vibration transmissions in the bones through the wrist joints of chain-saw operators were studied by a high-speed cineradiographic method. The results obtained were : 1) The amplitudes of the bone vibrations were clearly attenuated through the wrist joint, 2) The bones showed greater amplitudes than the forehandle, 3) The base of the ulnarstyloid process showed the greatest amplitudes in the distal forearm and 4) Frequencies of the bones might be within the resonant frequency of the hand. It was concluded that the high-speed cineradiographic method was the only useful technique to date for measuring bone vibrations. However, it is complicated and expensive.
