Effect of feet hyperpronation on pelvic alignment in a standing position

Hyperpronation may cause malalignment of the lower extremity, frequently leading to structural and functional deficits both in standing and walking. Our aim was to study the effect of induced foot hyperpronation on pelvic and lower limb alignment while standing. Thirty-five healthy subjects were requested to remain in a natural standing position for 20 s in four different modes: feet flat on the floor, and on wedges angled at 108 ,1 58 and 208, designed to induce hyperpronation. Sequencing was random, repeated three times and captured by eight computerizedcameras usingtheVICON 1 three-dimensional motionanalysis system.Wefoundthat standingonthewedgesatvariousangles, inducedhyperpronation,with 41%to90%of thechangesattributabletotheintervention.Inaddition, astatisticallysignificantincrease (paired t-test) in internal shank rotation (p < 0.0001), internal hip rotation (p < 0.0001) and anterior pelvic tilt (p < 0.0001) was identified. A strong correlation was found between segmental alignment in every two consecutive modes at all levels (r = 0.612‐0.985; p < 0.0001). These findings suggest that alignment of the lower extremity up to the pelvic girdle, can be altered, due to forces acting on the foot. Interaction between thefoot and pelvis occursin a kinematic chainreaction manner. Although this study waslimited tohealthy subjects, clinicians should be aware that when addressing pelvis and lower back dysfunction, foot alignment should be examined as a contributing factor. # 2006 Elsevier B.V. All rights reserved.