Abstract
Direct and indirect methods have been used in the past [L. Nokes, W. J. Czyz, Mintow, I. Mackie, J. A. Fairclough, and J. Williams, J. Bio. Med. Eng. 6, 45–48 (1984)] for the determination of natural frequency of bone. Most of them are cumbersome and costly. A simple and quick experimental technique based on the stress wave propagation through bone is developed. An acoustic vibrator as a source of stress wave is used to send the stress wave through bone specimen under test, in this case, an in vitro sample, and a microphone pickup is used to receive the acoustic signal at the other end of the bone, which, in turn, gives an electrical output to be measured on a calibrated electrical detecting system. The natural frequency of bone is determined for an optimum output with respect to different stress wave frequencies. A comparative study of normal and fractured bone is made to diagnose the size of the fracture and its rate of healing.
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