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1 Acta of Bioengineering and Biomechanics

1 2020

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Morphological characteristics of intrinsic foot muscles among flat foot and normal foot using ultrasonography

Sakamoto Kodai, Kudo Shintarou

Acta of Bioengineering and Biomechanics

2020

Vol. 22, no. 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. Methods: 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. Results: 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. Conclusions: 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.