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Int J Sports Med 2021; 42(10): 945-949
DOI: 10.1055/a-1373-5734
Orthopedics & Biomechanics

No Association of Plantar Aponeurosis Stiffness with Medial Longitudinal Arch Stiffness

Hiroaki Noro 
1   Graduate School of Health and Sports Science, Juntendo University, Inzai, Japan
2   Institute of Health and Sport Science & Medicine, Juntendo University, Inzai, Japan
,
Naokazu Miyamoto 
1   Graduate School of Health and Sports Science, Juntendo University, Inzai, Japan
,
Naotoshi Mitsukawa
3   Faculty of Human Sciences, Toyo Gakuen University, Bunkyo-ku, Japan
,
Toshio Yanagiya
1   Graduate School of Health and Sports Science, Juntendo University, Inzai, Japan
2   Institute of Health and Sport Science & Medicine, Juntendo University, Inzai, Japan
› Author Affiliations Funding: This work was supported by the Joint Research Program of Juntendo University, Faculty of Health and Sports Science Grant number 1412418; and by JSPS KAKENHI Grant number JP19H04005.
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Abstract

Lower stiffness of the medial longitudinal arch is reportedly a risk factor for lower leg disorders. The plantar aponeurosis is considered essential to maintaining the medial longitudinal arch. It is therefore expected that medial longitudinal arch stiffness is influenced by plantar aponeurosis stiffness. However, this has not been experimentally demonstrated. We examined the relationship between the plantar aponeurosis stiffness and medial longitudinal arch stiffness in humans in vivo. Thirty young subjects participated in this study. The navicular height and shear wave velocity (an index of stiffness) of the plantar aponeurosis were measured in supine and single-leg standing positions, using B-mode ultrasonography and shear wave elastography, respectively. The medial longitudinal arch stiffness was calculated based on body weight, foot length, and the difference in navicular height between the supine and single-leg standing conditions (i. e., navicular drop). Shear wave velocity of the plantar aponeurosis in the supine and single-leg standing positions was not significantly correlated to medial longitudinal arch stiffness (spine: r=−0.14, P=0.45 standing: r=−0.16, P=0.41). The findings suggest that the medial longitudinal arch stiffness would be strongly influenced by the stiffness of foot structures other than the plantar aponeurosis.

Key words

plantar fasciitis - shear wave elastography - ultrasonography - plantar fascia


Publication History

Received: 01 June 2020

Accepted: 11 January 2021

Article published online:
23 February 2021

© 2021. Thieme. All rights reserved.

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