In vivo radius bone evaluation in their teens by two longitudinal wave propagation

• Published in: The Journal of the Acoustical Society of America Vol. 142; no. 4; pp. 2565 - 2566
• Main Authors: Matsukawa, Mami, Mano, Isao, Yoneda, Yutaro, Horii, Kaoru, Umemura, Shiori, Ozaki, Etsuko
• Format: Journal Article
• Language: English
• Published: 01-10-2017
• ISSN: 0001-4966; 1520-8524
• DOI: 10.1121/1.5014381

An ultrasonic bone measurement system, LD-100 (OYO electric),1 has been developed for the evaluation of the distal 5.5% site of the radius of the non-dominant hand. The system measures two longitudinal waves (fast and slow waves) which propagate in the inside cancellous bone and echo waves reflected from the interface between the cortical and cancellous bones. The properties of these waves can give us the information of cancellous bones. We can also estimate the cortical thickness from the echo waves. For the small radius of teenagers, we have improved the system using an annular type transducer to avoid the effects of guided waves in the cortical bone. The radius bones of 654 teenagers were measured. The cortical thicknesses of female students in their late teens were around 95 % of the young adult mean (YAM), where those of male students showed variation from 90 to 100%. The cancellous bone densities in their late teens were 82–94% (female) and 66–85% (male). The growth of cancellous bone was late, which was clearer in men. In addition, the total bone growth of men seemed slower than that of women. 1H. Sai, et al., Osteoporos Int. (2010) 21:1781.