Abstract:Objective To explore the plantar pressure of limb laterality and different positions of ankle joint. Methods 23 healthy subjects were recruited to perform walking trails. Each subject was tested for plantar pressure in ankle neutral position, ankle inversion and ankle eversion through simple custom-designed walkways and plantar pressure plate. The evaluation indexes were peak pressure, contact area, contact time percentage, M/L (ratio of sum of medial plantar peak pressure to sum of lateral peak pressure), A/P (ratio of sum of toe peak pressure to heel peak pressure). Results (1)The peak pressure of the first metatarsus bone in the dominant foot was significantly larger than that in the non-dominant foot, the peak pressure of the fifth metatarsus bone was significantly smaller than that on the non-dominant foot.. The M/L of dominant side was significantly larger than that of the non-dominant side. (2)Except for peak pressures of mid-foot and the first toe, there were significant differences in other regions among the three ankle positions. The percentage of contact time in each area during inversion was greater than neutral position, and the percentage of contact time of plantar regions during eversion were longer than those of neutral position except the second toe. The M/L of inversion, neutral and eversion position were 1.24±0.46, 1.06±0.26, 0.88±0.25. The M/L of dominant foot was greater than the non-dominant foot; the A/P in the inversion and eversion conditions were greater than that in the neutral positions. Conclusions The stability of the dominant foot was better than that of the non-dominant foot. The standing stability was decreased during inversion and eversion. During inversion, the body shifted inward and forward to maintain stability. During eversion, the center of gravity shifted outward and forward.