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Fig. 1. The orientation of the equine digit during foot on and foot off. The
accelerometer is mounted axially on the dorsal hoof wall with the sensitive
axis orientated disto-proximally. Critically, the foot acceleration vector
(indicated by the red arrows) is orientated along the sensitive axis of the
accelerometer at foot on (d) and at foot off (g). However, during roll over
(f), when the heel of the foot (the most rearward point of the ground-bearing
surface) has left the ground and the foot is rotating around the toe (the most
forward point of the ground-bearing surface), the vector is orientated
orthogonal to the sensitive axis.