A slip occurs when a person, while walking, has their foot move further than expected in some direction as a result of lack of grip between the shoe sole/heel and the floor surface. The commonest, severely injurious slip comes from a heel strike slip occurring on initial contact of the heel with the floor surface. When a person walks in a straight line the leading foot makes contact with the outside of the heel and as the walking continues the foot rolls forward onto the front of the f6ot, and also rotates over so that the weight transfers to the big toe side of the foot with the final break off from contact coming off the big toe. Exactly where the initial contact is made on the heel depends on the gait of the person and structural aspects of the foot and leg, for example, whether or not the person has pronation or supination.
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