Relationship between Trunk Righting and One-sided Buttock Support in the Sitting Position Determined by Body Sway Analysis

Abstract

[Purpose] To investigate the diagnostic value of trunk righting using body sway analysis. [Subjects] Twenty-nine patients with hip or knee osteoarthritis were enrolled. [Methods] After evaluating trunk righting ability, body sway analysis was performed by placing one side of the buttocks on a sensor pad. The total length and area of body sway, locus length per unit area, and average speed were measured and compared between both sides. [Results] The side of the buttocks with superior trunk righting was associated with a smaller body sway area and a larger locus length per unit area. [Conclusion] The findings of the present study suggest that greater trunk righting indicates better postural stability.