Spatial variations in Achilles tendon shear wave speed.
Spatial variations in Achilles tendon shear wave speed.
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DOI：
10.1016/j.jbiomech.2014.05.008
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发表时间：
2014-08-22
影响因子：
2.4
通讯作者：
Thelen, Darryl G.
中科院分区：
文献类型：
--
作者：
DeWall, Ryan J.;Slane, Laura C.;Lee, Kenneth S.;Thelen, Darryl G.
关键词：
超音速剪切成像 (SSI) 是一种超声成像模式，可以通过测量剪切波传播速度（取决于组织弹性的特性）来深入了解组织力学。 SSI 之前曾被用来表征加载时发生的跟腱剪切波速度的增加，这种效应归因于组织的应变硬化行为。然而，人们对剪切波速度如何在空间上变化知之甚少，考虑到跟骨插入和腓肠肌肌腱交界处之间发生的解剖变化，这一点很重要。本研究的目的是研究三种不同踝关节姿势下，沿着跟腱内侧和外侧路径的剪切波速度的空间变化：静息踝关节角度（R，即中立）、跖屈（P；R − 15 度）和背屈（D；R + 15 度）。我们观察到十名健康年轻人的肌腱剪切波速度存在显着的空间和姿势变化。在静止位置，跟腱自由腱的剪切波速度平均为 12 ± 1.2 m/s，但在被动跖屈时降低至 7.2 ± 1.8 m/s。当脚踝处于被动背屈姿势（距 R +15 度）时，远端肌腱剪切波速度通常会达到系统的最大跟踪极限（16.3 m/s）。在固定姿势下，从游离肌腱到腓肠肌肌腱交界处，剪切波速度显着降低，内侧测得的速度略高于外侧。剪切波速度与肌腱的厚度和深度只有微弱的相关性，这表明远端到近端的变化可能反映了腱膜相对于游离肌腱的更大的顺应性。结果强调了在使用 SSI 进行跟腱生物力学和临床评估时考虑肢体姿势和传感器定位的重要性。
Supersonic shear imaging (SSI) is an ultrasound imaging modality that can provide insight into tissue mechanics by measuring shear wave propagation speed, a property that depends on tissue elasticity. SSI has previously been used to characterize the increase in Achilles tendon shear wave speed that occurs with loading, an effect attributable to the strain-stiffening behavior of the tissue. However, little is known about how shear wave speed varies spatially, which is important, given the anatomical variation that occurs between the calcaneus insertion and the gastrocnemius musculotendon junction. The purpose of this study was to investigate spatial variations in shear wave speed along medial and lateral paths of the Achilles tendon for three different ankle postures: resting ankle angle (R, i.e. neutral), plantarflexed (P; R − 15 deg), and dorsiflexed (D; R + 15 deg). We observed significant spatial and posture variations in tendon shear wave speed in ten healthy young adults. Shear wave speeds in the Achilles free tendon averaged 12 ± 1.2 m/s in a resting position, but decreased to 7.2 ± 1.8 m/s with passive plantarflexion. Distal tendon shear wave speeds often reached the maximum tracking limit (16.3 m/s) of the system when the ankle was in the passively dorsiflexed posture (+15 deg from R). At a fixed posture, shear wave speeds decreased significantly from the free tendon to the gastrocnemius musculotendon junction, with slightly higher speeds measured on the medial side than on the lateral side. Shear wave speeds were only weakly correlated with the thickness and depth of the tendon, suggesting that the distal-to-proximal variations may reflect greater compliance in the aponeurosis relative to the free tendon. The results highlight the importance of considering both limb posture and transducer positioning when using SSI for biomechanical and clinical assessments of the Achilles tendon.
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