Untreated, cracks can penetrate the inner hoof wall to the living corium and travel up to the coronet 4 5 6 CORONET OUTER WALL INNER WALL PEDAL BONE NAVICULAR BONE DIGITAL CUSHION DEEP FLEXOR TENDON FROG SOLE Page 42 • HORSES & PEOPLE • Phone: 07 5467 9796 • firstname.lastname@example.org “ Horses and People Magazine June 2011 issue The underlying cause of sand cracks is simple mechanical failure; the inability of the outer hoof wall to expand sideways under pressure. Put simply, the ground surface of the equine hoof is not meant to be flat and there are in fact two areas that must be non weightbearing.
Firstly, the outer wall acts as armor plating and is hard to the point of being brittle.
It is not designed to carry weight.
The hoof wall consists of two distinct parts – the outer wall which grows downwards from the corium inside the coronary band and the inner wall which grows both outwards and downwards from the corium surrounding the pedal bone.
The inner wall is more malleable and much better suited to the task of weightbearing.
Photo 6 shows a clear distinction between the dark colored outer wall and the vividly white inner wall (Photo 6).
Secondly, a functionally correct hoof has a consistent height of wall above the plane of sole which simply reflects the contour of the pedal bone within.
The sole plane dips downwards as it enters the quarters and the ground surface of the hoof wall needs to reflect this.
The hoof wall in the quarters should not be weightbearing.
Any hoof that is weightbearing through the outer wall or quarters has incorrect weightbearing and is prone to sand crack development.
Mechanical stress is magnified if a hoof is flared or run out at the toe, especially with a club foot as shown in photo 7. ” 7
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