Comparison of Lower Extremity Biomechanics and Postural Stability in Individuals With Pes Planus

The goal of this observational study is to examine the relationship between plantar flexor endurance and postural and tibial sway in adults (≥18 years) with pes planus (flatfoot). The main questions it aims to answer are: Is there a correlation between plantar flexor endurance, postural sway and tibial sway during single-leg stance? Participants will: Perform a heel rise test to assess plantar flexor endurance Stand on one leg while wearing a motion sensor to measure postural and tibial sway Complete the tests under both eyes-open and eyes-closed conditions