Human plantar fascial dimensions and shear wave velocity change in vivo as a function of ankle and metatarsophalangeal joint positions
Human plantar fascial dimensions and shear wave velocity change in vivo as a function of ankle and metatarsophalangeal joint positions
复制标题
人体足底筋膜尺寸和体内剪切波速度随踝关节和跖趾关节位置的变化
DOI：
10.1152/japplphysiol.00485.2020
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发表时间：
2021
影响因子：
3.3
通讯作者：
Kawakami Yasuo
中科院分区：
文献类型：
--
作者：
Shiotani Hiroto;Maruyama Nana;Kurumisawa Keisuke;Yamagishi Takaki;Kawakami Yasuo
足底筋膜 (PF) 是足弓弹性的主要贡献者，根据踝关节和跖趾 (MTP) 关节的位置，可能会经历松弛、拉紧和拉伸状态。由于 PF 在尺寸和刚度方面具有近远部位差异，因此对施加张力的响应也可能是部位特定的。此外，PF 在拉伸超过松弛长度时有助于支撑足弓，但从未在体内进行过定量评估。本研究使用磁共振和超声剪切成像技术，研究了踝关节和 MTP 关节位置对从近端到远端三个不同部位的 PF 长度、局部厚度和剪切波速度 (SWV) 的影响。在被动踝关节背屈期间，当踝关节通过 10°-0° 踝关节跖屈定位时，在近端部位观察到 SWV 上升（松弛长度的指示），PF 长度增加最多 3mm (+1.5%)。另一方面，当MTP关节背屈40°且踝关节跖屈30°–20°时，远端部位的SWV增加，并且在此位置，PF延长达4mm（+2.3%）。除了松弛长度之外，SWV 在所有测量部位都向最大背屈角呈曲线增加，而 PF 则延长至 9 毫米 (+7.6%)，而其厚度没有可测量的变化。这项研究提供了证据，证明足底筋膜尺寸和 SWV 根据踝关节和 MTP 关节位置以特定部位的方式变化，这可以使人体运动过程中足弓的弹性多样化。新的和值得注意的通过结合矢状磁共振和超声剪切成像技术检查了足底筋膜尺寸和 SWV 的关节角度依赖性和部位特异性。我们发现 PF SWV 的特定位置变化与关节角度位置有关，即 PF 松弛度和弹性在踝关节和 MTP 角度的不同组合中发生变化。我们的研究结果表明，PF 可以在人类双足运动的整个站立阶段弹性支撑足弓。
The plantar fascia (PF), a primary contributor of the foot arch elasticity, may experience slack, taut, and stretched states depending on the ankle and metatarsophalangeal (MTP) joint positions. Since PF has proximodistal site difference in its dimensions and stiffness, the response to applied tension can also be site specific. Furthermore, PF can contribute to supporting the foot arch while being stretched beyond the slack length, but it has never been quantitatively evaluated in vivo. This study investigated the effects of the ankle and MTP joint positions on PF length and localized thickness and shear wave velocity (SWV) at three different sites from its proximal to distal end using magnetic resonance and supersonic shear imaging techniques. During passive ankle dorsiflexion, rise of SWV, an indication of slack length, was observed at the proximal site when the ankle was positioned by 10°-0° ankle plantar flexion with up to 3 mm (+1.5%) increase in PF length. On the other hand, SWV increased at the distal site when MTP joint dorsiflexed 40° with the ankle 30°–20° plantar flexion, and in this position, PF was lengthened up to 4 mm (+2.3%). Beyond the slack length, SWV curvilinearly increased at all measurement sites toward the maximal dorsiflexion angle whereas PF lengthened up to 9 mm (+7.6%) without measurable changes in its thickness. This study provides evidence that the dimensions and SWV of PF change in a site-specific manner depending on the ankle and MTP joint positions, which can diversify foot arch elasticity during human locomotion.NEW & NOTEWORTHYJoint angle dependence and site specificity of the plantar fascial dimensions and SWV were examined by combining sagittal magnetic resonance and supersonic shear imaging techniques. We revealed that the site-specific changes in PF SWV were related to joint angle positions, i.e., PF slackness and elasticity changed in varying combinations of ankle and MTP angle. Our findings suggest that PF can elastically support the foot arch throughout the stance phase of human bipedal locomotion.