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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Assessing postural stability in flatfoot using a time-in-boundary method during single-leg standing.

Paul S Sung1, Dongchul Lee2

  • 1Indiana Wesleyan University, Marion, Indiana, USA.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|October 4, 2024
PubMed
Summary

Individuals with flatfoot experience poorer balance and stability. The Time-in-Boundary method revealed initial stability deficits in flatfoot, but participants improved with practice, showing postural control adaptability.

Keywords:
center of pressureflatfootpostural controlpostural stabilitysingle‐leg‐stance

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Area of Science:

  • Biomechanics
  • Human Motor Control
  • Orthopedics

Background:

  • Flatfoot, a common foot deformity, involves arch collapse, significantly affecting balance and stability.
  • Postural control is crucial for maintaining equilibrium, and deformities like flatfoot can impair this system.

Purpose of the Study:

  • To investigate postural adjustments and sway excursions in individuals with and without flatfoot.
  • To evaluate the efficacy of the Time-in-Boundary method in assessing postural control in this population.

Main Methods:

  • The Time-in-Boundary method was employed to assess relative stability.
  • Participants (with and without flatfoot) performed single-leg stances across various center of pressure radius thresholds.
  • Three trials were conducted to observe changes in stability over time.

Main Results:

  • Significant interactions were found in threshold levels and normalized relative stable times, particularly in initial trials.
  • The flatfoot group initially showed reduced stability across multiple thresholds (10-30mm).
  • Participants demonstrated improved stability control with successive trials, indicating adaptive learning.

Conclusions:

  • The Time-in-Boundary method is effective for assessing postural control in individuals with flatfoot.
  • Despite initial challenges, the postural control system demonstrates adaptability to the biomechanical demands of flatfoot.
  • Findings support the use of this method for developing tailored rehabilitation strategies.