The deep digital flexor tendon runs down the back of the cannon bone and attaches to the rear of the coffin bone within the hoof. If the tendon is too short relative to the length of the lower limb, then the heel is pulled up and the coffin bone is tipped up on end, resulting in a steep hoof wall, also known as a "club foot." This disorder can be congenital (present at birth) or acquired, and is more commonly seen in front limbs but can occur in hind limbs.

If congenital, this problem is usually noticed when a foal first stands. In the newborn foal, there is a short window of time in which simple treatments may make a great difference to the course of the condition. Prompt communication with your vet is the key. If acquired, this problem becomes apparent during the growth of a foal, and nutrition may play a causative role.

This problem can also occur in a horse of any age with an underlying lameness that causes abnormal use of the limb, especially if they do not bear weight normally for an extended period. See the other related record Club Foot, Flexural Deformity (in Adult), for more information.