Amemiya Ayumi, Okonogi Rena, Yamakawa Hiroki, Susumu Kaori, Jitsuishi Tatsuya, Sugawara Hisayoshi, Tanaka Yuji L, Komiyama Masatoshi, Mori Taketoshi
Annu Int Conf IEEE Eng Med Biol Soc. 2017 Jul;2017:4487-4490. doi: 10.1109/EMBC.2017.8037853.
Callus is one of the main causes of diabetic foot ulcers. Therefore, preventing callus formation is very important. In a previous study, it was clarified that callus formation under the first metatarsal head (MTH) is associated with high shear stress time integral/pressure time integral (SPR-i). another study, it was clarified that rocker sole shoes are effective in reducing peak pressure under the first MTH. Therefore, we hypothesized that rocker sole shoes reduce SPR-i under the first MTH. This study aimed to clarify the effect of rocker sole shoes for external forces and leg motions in comparison with that of the normal sole shoes.
In-shoe external forces and leg motions were measured during walking wearing the normal sole shoes or the rocker sole shoes in healthy participants. As the external forces, the peak plantar pressure (PP), pressure time integral (PI), peak shear stress (PSS), and shear stress integral (SSI) of each gait cycle were calculated. Additionally, shear stress-pressure ratios (SPR) were calculated by dividing shear stress by pressure; concretely, peak values (SPR-p) and time integral values (SPR-i). As the leg motion, hip and knee joint motions were analyzed for the axis of flexion- extension. Three axes of ankle joint motion (inversion-eversion, plantar flexion-dorsiflexion, and adduction-abduction) were analyzed.
Six participants attended, and twelve feet were analyzed. When wearing the rocker sole shoes, the SPR-i under the first MTH was significantly smaller than when wearing the normal sole shoes. The SPR-i higher than 0.60 is associated with callus formation under the first MTH. In three of five feet with callus, SPR-i exceeded 0.60 in the normal sole shoes. The SPR-i of all three feet became smaller than 0.60 when wearing the rocker sole shoes. Although the knee (flexion-extension) and ankle (plantar flexion-dorsiflexion) joint motion became smaller when wearing the rocker sole shoes, there was no significant difference in walking speed. It is considered that propulsion was maintained by the push-off support provided by rocker sole shoes.
It was suggested that rocker sole shoes are effective preventing callus formation under the first MTH.
胼胝是糖尿病足溃疡的主要病因之一。因此，预防胼胝形成非常重要。在之前的一项研究中，已阐明第一跖骨头（MTH）下方的胼胝形成与高剪切应力时间积分/压力时间积分（SPR-i）相关。在另一项研究中，已阐明摇椅底鞋在降低第一跖骨头下方的峰值压力方面是有效的。因此，我们推测摇椅底鞋可降低第一跖骨头下方的SPR-i。本研究旨在阐明与普通底鞋相比，摇椅底鞋对外力和腿部运动的影响。
在健康参与者穿着普通底鞋或摇椅底鞋行走期间，测量鞋内的外力和腿部运动。作为外力，计算每个步态周期的足底峰值压力（PP）、压力时间积分（PI）、峰值剪切应力（PSS）和剪切应力积分（SSI）。此外，通过将剪切应力除以压力来计算剪切应力-压力比（SPR）；具体而言，包括峰值（SPR-p）和时间积分值（SPR-i）。作为腿部运动，分析髋关节和膝关节屈伸轴的运动。分析踝关节运动的三个轴（内翻-外翻、跖屈-背屈和内收-外展）。
六名参与者参加，共分析了十二只脚。穿着摇椅底鞋时，第一跖骨头下方的SPR-i显著小于穿着普通底鞋时。SPR-i高于0.60与第一跖骨头下方的胼胝形成相关。在五只有胼胝的脚中，有三只在穿着普通底鞋时SPR-i超过0.60。当穿着摇椅底鞋时，这三只脚的SPR-i均小于0.60。尽管穿着摇椅底鞋时膝关节（屈伸）和踝关节（跖屈-背屈）的运动变小，但步行速度没有显著差异。据认为，摇椅底鞋提供的蹬离支撑维持了推进力。
提示摇椅底鞋在预防第一跖骨头下方的胼胝形成方面是有效的。
