Han S, Medige J, Faran K, Feng Z, Ziv I
Department of Orthopaedic Surgery, SUNY at Buffalo, USA.
Med Eng Phys. 1997 Dec;19(8):742-7. doi: 10.1016/s1350-4533(97)00028-3.
The ability of quantitative ultrasound to predict the mechanical properties of trabecular bone under different strain rates was investigated. Ultrasound velocity (UV) and broadband attenuation (BUA) were measured for 60 specimens of human trabecular bone. Samples were divided into two equal groups and loaded in compression at the strain rates of 0.0004 and 0.08 s-1. The ultimate strength, elastic modulus, and energy absorption capacity were determined for each specimen. Specimens tested at 0.08 s-1 had a mean value of strength 63% higher than the specimens tested at 0.0004 s-1. The elastic modulus and energy absorption capacity were 82% and 42% higher, respectively, for the higher strain rate. UV and BUA were significantly associated with most mechanical properties at both strain rates. All mechanical properties were also correlated strongly with a linear combination of UV and BUA for both the low and high loading rates. The use of ultrasound parameters may provide good clinical means for assessing the resistance of trabecular bone to both low and high energy trauma.
研究了定量超声预测不同应变率下松质骨力学性能的能力。对60个人类松质骨标本测量了超声速度（UV）和宽带衰减（BUA）。样本被分成两组，分别以0.0004和0.08 s-1的应变率进行压缩加载。测定每个标本的极限强度、弹性模量和能量吸收能力。在0.08 s-1下测试的标本强度平均值比在0.0004 s-1下测试的标本高63%。对于较高的应变率，弹性模量和能量吸收能力分别高出82%和42%。在两种应变率下，UV和BUA与大多数力学性能均显著相关。对于低加载率和高加载率，所有力学性能也都与UV和BUA的线性组合密切相关。超声参数的应用可为评估松质骨对低能量和高能量创伤的抵抗力提供良好的临床手段。
