Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
Department of Orthopedic Surgery, Nagasaki University, Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8501, Japan.
J Acoust Soc Am. 2022 Aug;152(2):890. doi: 10.1121/10.0012689.
For simple, safe, portable, and inexpensive evaluation suitable for leg bone diseases of racehorses in the field, an ultrasonic measurement technique was applied to evaluate wave velocities. A digital model of the third metacarpal bone with the bucked shin was fabricated using high-resolution peripheral quantitative computerized tomography data of a racehorse. This model was anisotropic and heterogeneous, and was constructed using the measured ultrasonic wave velocities in the bone. With this model, ultrasonic wave propagation along the bone axis was simulated using the elastic finite-difference time-domain method. We found two main waves with different propagation velocities. The fast-waves showed a wave velocity close to the longitudinal wave in the axial direction. However, the apparent velocities changed dramatically owing to bone surface irregularities (changes of the shape) in the area of bucked shin. The slow-waves showed a wave velocity close to the shear wave, which was unaffected by the bone surface irregularities. The simple comparison of different wave behaviors may be a suitable parameter for the initial in vivo screening of bucked shin in the legs of racehorses, which can be performed in the field.
为了在野外对赛马的腿部骨骼疾病进行简单、安全、便携且廉价的评估，应用超声测量技术来评估波速。使用赛马的高分辨率外周定量计算机断层扫描数据，制作了带有弯曲胫骨的第三掌骨的数字模型。该模型各向异性且不均匀，使用在骨中测量的超声波速度进行构建。使用该模型，通过弹性有限差分时域方法模拟了沿骨轴的超声波传播。我们发现了两个具有不同传播速度的主波。快波显示出接近轴向纵波的波速。然而，由于弯曲胫骨区域的骨表面不规则（形状变化），表观速度发生了剧烈变化。慢波显示出接近横波的波速，不受骨表面不规则的影响。不同波行为的简单比较可能是赛马腿部弯曲胫骨的初始体内筛选的合适参数，可以在野外进行。
