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Annotated typical ground reaction force trace. P1 – initial contact, P2 – impact force peak, P3 – medial peak force, P4 – max posterior braking, P5 – max heel contact, P6 – midstance, P7 – max vertical thrust, P8 – max anterior propulsive, P9 – toe off, I1 – medial impulse, I2 – braking impulse, I3 – propulsive impulse. Fx = mediolateral force; Fy = anterior posterior force; Fz = vertical force.
