Assessing postural stability in flatfoot using a time-in-boundary method during single-leg standing.

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.