Figure 1From: Cardan angle rotation sequence effects on first-metatarsophalangeal joint kinematics: implications for measuring hallux valgus deformity The hallux behaves as the fulcrum point of gait propulsion. Lines on the floor depict the foot-progression angle which averages 10° from the midsagittal line. The line on the foot estimates the normal pattern of center-of-pressure (COP) which shifts towards the hallux during the final stages of gait.Back to article page