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This method assessed relative stability by exploring various center of pressure radius thresholds during three trials of single\u2010leg stance. We observed significant interactions in threshold levels (<jats:italic>F<\/jats:italic>\u2009=\u20094.37, <jats:italic>p<\/jats:italic>\u2009=\u20090.04) and normalized relative stable times (<jats:italic>F<\/jats:italic>\u2009=\u20097.64, <jats:italic>p<\/jats:italic>\u2009=\u20090.01), particularly in the initial trials. Initially, the flatfoot group showed marked decreases in stable times at 10\u2009mm, 15\u2009mm, and 20\u2009mm thresholds, which expanded to 25\u2009mm and 30\u2009mm in subsequent trials. Despite a significant decrease in stability at the 30\u2009mm threshold in early trials, participants exhibited improved stability control as trials progressed. This enhancement likely reflects a combination of a learning effect and an increased understanding of the task requirements, underscoring the adaptability of postural control systems to the biomechanical challenges posed by flatfoot. The Time\u2010in\u2010Boundary method has proven to be an effective tool for clinicians to assess postural control, playing a vital role in developing customized rehabilitation strategies for individuals with flatfoot.<\/jats:p>","DOI":"10.1002\/jor.25987","type":"journal-article","created":{"date-parts":[[2024,10,4]],"date-time":"2024-10-04T11:35:47Z","timestamp":1728041747000},"page":"379-387","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Assessing postural stability in flatfoot using a time\u2010in\u2010boundary method during single\u2010leg standing"],"prefix":"10.1002","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8468-6761","authenticated-orcid":false,"given":"Paul S.","family":"Sung","sequence":"first","affiliation":[{"name":"Indiana Wesleyan University Marion Indiana 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