In rare cases the coffin bone may be involved in the injury and a small portion of it may become carious.
The navicular bone is short, flattened above and below, and is attached to the coffin bone behind.
The coronet is a short, cube-shaped bone, set between the large pastern and coffin bone, in the same oblique direction.
The lateral cartilages are attached, one on each side, to the wings of the coffin bone by their inferior borders.
The sensitive laminæ are thin plates of soft tissue covering the entire anterior surface of the coffin bone.
In some instances nails may puncture the flexor tendons, the coffin bone, or enter the coffin joint.
When the wound is forward, near the toe, and deep enough to injure the coffin bone, caries always results.
The foot-axis is an imaginary line passing from the fetlock joint through the long axes of the two pasterns and coffin bone.
The coffin bone and navicular bone sink a little and rotate backward.
Wasting of the coffin bone and inflammation of its covering with caries is not unusual.