the short pastern bone 3 the long pastern bone 4 and the distal sesamoid or navicular bone 5 in addition to the deep digital flexor tendon 6 which stretches from the pedal bone 2 under the navicular bone 5 and upward to the upper rear portion of the horse 39 s leg also depicted is a tendon adhesion 7 a frequently alleged cause of podotrochlosis fig2 is a parasagittal view of hoof 1 from the dorsalis perspective showing the structural relationship of the foot bones 0031 fig3 is a schematic lateral view of a cross section taken along line 3 3 of fig1 again showing the relationship of the pedal bone 2 the short pastern bone 3 and the navicular bone 5 as well as the deep digital flexor tendon 6 as depicted in fig3 when weight is placed on the hoof 1 it creates pressure on tendon 6 which results in pressure p on both the navicular bone 5 and the short pastern bone 3 in addition movement of the deep digital flexor tendon 6 creates tension stress u21c4 t on the navicular bone 5 0032 fig4 depicts a typical sonar emitting shockwave emitting device 8 being aligned with hoof 1 wherein the u shaped underside is filled with sonar transmission enhancing agent 9 in order to ensure that the shockwaves will be focused on.