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The elastic modulus of foot soft tissues and its association with gait biomechanics still remain unclear. For this study, we recruited 20 young individuals with flatfoot and 22 age-matched individuals with normal foot arches. The elastic modulus of foot soft tissues (posterior tibial tendon, flexor digitorum brevis, plantar fascia, heel fat pad) was obtained via ultrasound elastography. Gait data were acquired using an optical motion capture system. The association between elastic modulus and gait data was analyzed via correlation analysis. The elastic modulus of the plantar fascia (PF) in individuals with flatfoot was higher than that in individuals with normal foot arches. There was no significant difference in the elastic modulus of the posterior tibial tendon (PTT), the flexor digitorum brevis (FDB), or the heel fat pad (HFD), or the thickness of the PF, PTT, FDB, and HFD. Individuals with flatfoot showed greater motion of the hip and pelvis in the coronal plane, longer double-support phase time, and greater maximum hip adduction moment during walking. The elastic modulus of the PF in individuals with flatfoot was positively correlated with the maximum hip extension angle (r = 0.352, p = 0.033) and the maximum hip adduction moment (r = 0.429, p = 0.039). The plantar fascia is an important plantar structure in flatfoot. The alteration of the plantar fascia\u2019s elastic modulus is likely a significant contributing factor to gait abnormalities in people with flatfoot. More attention should be given to the plantar fascia in the young population with flatfoot.<\/jats:p>","DOI":"10.3390\/bioengineering11070728","type":"journal-article","created":{"date-parts":[[2024,7,18]],"date-time":"2024-07-18T10:39:26Z","timestamp":1721299166000},"page":"728","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Association between Elastic Modulus of Foot Soft Tissues and Gait Characteristics in Young Individuals with Flatfoot"],"prefix":"10.3390","volume":"11","author":[{"given":"Xin","family":"Jiao","sequence":"first","affiliation":[{"name":"Shanghai Key Laboratory of Orthopedic Implant, Department of Orthopedic Surgery, Shanghai Ninth People\u2019s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China"},{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianyi","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongjin","family":"Li","sequence":"additional","affiliation":[{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Binbin","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-6375-0681","authenticated-orcid":false,"given":"Mirabel Ewura Esi","family":"Acquah","sequence":"additional","affiliation":[{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zengguang","family":"Wang","sequence":"additional","affiliation":[{"name":"Shanghai Key Laboratory of Orthopedic Implant, Department of Orthopedic Surgery, Shanghai Ninth People\u2019s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China"},{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qianqian","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Ultrasound, Shanghai Ninth People\u2019s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7263-4983","authenticated-orcid":false,"given":"Yaokai","family":"Gan","sequence":"additional","affiliation":[{"name":"Shanghai Key Laboratory of Orthopedic Implant, Department of Orthopedic Surgery, Shanghai Ninth People\u2019s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongyun","family":"Gu","sequence":"additional","affiliation":[{"name":"Shanghai Key Laboratory of Orthopedic Implant, Department of Orthopedic Surgery, Shanghai Ninth People\u2019s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China"},{"name":"School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China"},{"name":"Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai 200030, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,18]]},"reference":[{"key":"ref_1","first-page":"AC17","article-title":"Prevalence of Flexible Flat Foot in Adults: A Cross-Sectional Study","volume":"11","author":"Aenumulapalli","year":"2017","journal-title":"J. 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