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Background and Aim: According to clinical observation, foot hyperpronation is very prevalent and may cause malalignment of the lower extremity in which can lead to structural and functional deficits in standing and walking. The aim of this study was to investigate of  foot hyperpronation effect on spine alignment in standing position.

Material and Method: Thirty-five healthy male ranging 18 - 30 years old were participated in this study. Evaluation was performed with two examiner in four standing positions (on the floor, on the wedges angled at 10, 15 and 20 degrees) using motion analysis system (zebris) and each one of measurement methods repeated three times. SPSS version 17.0 and paired t- test and repeated measures were used for statistical analysis.

Results: Significant difference was seen between all modes in sacral angle, pelvic inclination, lumbar lordosis and thoracic kyphosis variables (except between the first and second mode. Finally, with increasing wedge angle, a positive correlation obtained  for the examiners and all variables.

 Conclusions: The results of this study showed with increasing bilateral foot pronation, sacral angle, pelvic inclination, lumbar lordosis and thoracic kyphosis were increased. In fact, each one of them considered a compensatory phenomenon.