The effect of thoracic lateral deviation on gait parameters in blindfolded gait

[Purpose] To investigate the influence of thoracic lateral deviation on gait trajectory during blindfolded gait in able-bodied participants. [Participants and Methods] Twenty-three healthy adult males were classified into left, excessive left, and right groups based on thoracic lateral deviation while standing. Gait speed, progression angle, and pelvic and thoracic rotation angles were measured under full vision and no vision conditions using three-dimensional motion analysis. The effect size was calculated for each group. [Results] Thirteen participants were classified into the left group, nine into the excessive left group, and one into the right group. The patient in the right group was excluded from the study. Both remaining groups showed significantly smaller progression angles during no-vision gait, indicating leftward gait deviation. The pelvic and thoracic rotation angles were significantly smaller during no-vision gait only in the excessive left group. Effect sizes were larger in the excessive left group than in the left group. [Conclusion] Participants with excessive left thoracic deviation exhibited significant leftward gait deviation and increased leftward pelvic and thoracic rotations during blindfolded gait. Left thoracic deviation may influence structural asymmetry and sensory input, and is related to gait trajectory during blindfolded gait. These findings provide insights into the potential causes of gait asymmetry in able-bodied participants.