Pes Planus Plantaris (Flat Foot) Decreases Postural Stability of Basketball Student-athletes through Ground Reaction Force Vector (vGRF)

Purpose: The main objective of this study is to determine the pes planus plantaris condition can contribute to the disturbance of postural stability on basketball athlete's in static and dynamics activities. Methods: This cross-sectional quantitative analytical retrospective study on 47 subjects of basketball student-athletes were identified the foot arch index by footprint extensive area, and AMTI Force flat-form (force plate) were determined their postural stability. Subjects were conducted in three activities (static, dynamic vertical jump, and dynamic loading response) for GRF resultant force vectors towards the vertical plane of body mass (W). Results: Analytical result obtained 80.9% of subjects had pes planus plantaris. It shows no significant differences in pes planus plantaris incidence in both sexes subject (p>0.005), however, there are differences in athlete’s exercise period aspect. Athlete students who have practiced strictly more than 4 years experienced over 50% for pes planus plantaris, furthermore, long period exercise were believed stimulating pes planus. The average value of GRF forces vectors of pes planus plantaris subjects on three different basketball movements shows a significant correlation to postural stability. Conclusions: Pes planus plantaris affected almost basketball athlete regarding the length and intensity of exercise performed. The condition significantly contribute to postural stability disturbance on a static condition, dynamic vertical jump, and dynamic vertical jump loading response.