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.