Abstract
The purpose of this study was to clarify the manner in which foot pronation affected lateral dynamic stability during turns and the specific factors involved. Based on the results of a navicular drop test, 14 healthy subjects and 28 limbs were divided into two groups: standard and pronation. The task motions were spin and step turns from linear walking. The extrapolated center of mass (Xcom) from the outer edge of the base of support, the center of pressure (COP), center of mass velocity, and the amount of change in the angle of ankle adduction and abduction were calculated. Results suggested that the lateral Xcom was located more outside in the pronation group than the standard group, which showed the instability. With the step turn, the pronation group exhibited greater stability with the lateral Xcom located inside as compared with the standard group. The COP position in the foot on the support side was deviated to the hallux side of the pronation group in both the spin and step turns.
https://ror.org/03jqeq923 
