Spatial Variations in Achilles Tendon Shear Wave Speed Using a Cost-Effective Method of Accelerometers

Muhammad Salman, Conghui Ge, Clint Morris
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Abstract

Currently there are no cost-effective ways to quantitatively measure the in-vivo mechanical properties of the Achilles tendon. Stiffness can be used as a measure of tone and mechanical integrity of both muscles and tendons. Stiffness of the Achilles tendon (AT) can be quantified by the speed of shear wave propagation. The speed of propagation can then be used to find the instantaneous shear modulus. Currently there are other methods such as Ultrasound (US) imaging and Magnetic Resonance Imaging (MRI) which are used clinically to determine the variations in stiffness of the AT. However, these methods require complex signal processing and experienced technicians. Moreover, US imaging technique is limited in measuring high shear wave speed values which are greater than 17 m/s. In this research, one-dimensional accelerometers were used to measure acceleration through the AT. Then a cross-correlation signal processing technique was used to convert acceleration to the velocity of shear wave propagation across the AT. This method could potentially evaluate the mechanical properties of both normal and damaged tendons. This process has proven to be a cost-effective and simple way to assess the stiffness of the AT. The modulus of elasticity (E) was found using the following relation: E = 3ρV2.
利用高效的加速度计方法研究跟腱横波速度的空间变化
目前还没有经济有效的方法来定量测量跟腱的体内力学性能。刚度可以用来衡量肌肉和肌腱的张力和机械完整性。跟腱的刚度可以通过横波的传播速度来量化。然后可以用传播速度来求瞬时剪切模量。目前还有其他方法,如超声(US)成像和磁共振成像(MRI),用于临床确定AT的刚度变化。然而,这些方法需要复杂的信号处理和经验丰富的技术人员。此外,US成像技术在测量大于17 m/s的高横波速度值时受到限制。在本研究中,使用一维加速度计通过AT测量加速度。然后利用互相关信号处理技术将加速度转换为横波在AT上的传播速度。这种方法可以潜在地评估正常和受损肌腱的力学性能。这一过程已被证明是一种经济、简单的评估AT刚度的方法。弹性模量(E)由以下关系式求得:E = 3ρV2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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