The foot is primarily affected by FHL. The rolling of the step on the outer edge of the foot alters stability and the pronation before propulsion dramatically increases the mechanical constraints on the hallux. Thus, depending on the case, we see deformations of the forefoot, the appearance of early osteoarthritis or interdigital nerve compression. But above all, the "cord" effect created by FHL under the sole of the foot is the main cause of the collapse of the medial arch due to inappropriate efforts on the midfoot, which in the long run leads to a flat foot in people at risk. We detail here the most frequent consequences due to FHL.