Sakamoto Kodai, Kudo Shintarou
Graduate School of Health Sciences, Morinomiya University of Medical Sciences.
Inclusive Medical Science Research Institute, Morinomiya University of Medical Sciences.
Acta Bioeng Biomech. 2020;22(4):161-166.
The purpose of this study was to compare the morphology of the intrinsic foot muscle between typical foot and flat foot with the use ultrasound.
Thirty-seven healthy participants were recruited in this study. Foot types were classified using the Foot posture index 6-item version. A total of 43 flat feet and 31 typical feet were examined. Using B-mode ultrasound imaging, the morphology of the abductor hallucis, oblique head of adductor hallucis, abductor digiti minimi, and flexor digitorum brevis muscles were measured. Morphology of all muscles measured was normalized by body height. The independent Student's t-test was used to examine the differences in the thickness and the cross-sectional area (CSA) of the intrinsic foot muscle among the two groups.
The thickness of abductor hallucis was significantly larger in flat foot group. The thickness and CSA of abductor digiti minimi and the thickness of oblique head of adductor hallucis were significantly smaller in flat foot group.
Our results showed hypertrophied adductor hallucis, atrophied abductor digiti minimi, and atrophied oblique head of the adductor hallucis in individuals with flat feet, suggesting a possible tendency to hypertrophy in muscles that are located in a medial position and a possible tendency to atrophy in muscles that are located in a lateral position in flat feet.
本研究旨在利用超声比较扁平足与正常足的足部固有肌形态。
本研究招募了37名健康参与者。采用足部姿势指数6项版本对足型进行分类。共检查了43只扁平足和31只正常足。使用B型超声成像测量拇展肌、拇收肌斜头、小趾展肌和趾短屈肌的形态。所测量的所有肌肉的形态均按身高进行标准化。采用独立样本t检验来检验两组之间足部固有肌厚度和横截面积（CSA）的差异。
扁平足组拇展肌厚度显著更大。扁平足组小趾展肌的厚度和CSA以及拇收肌斜头的厚度显著更小。
我们的结果显示，扁平足个体存在拇收肌肥大、小趾展肌萎缩以及拇收肌斜头萎缩的情况，提示扁平足中位于内侧位置的肌肉可能有肥大倾向，而位于外侧位置的肌肉可能有萎缩倾向。
