Answer: Contracted flexor tendons (flexural deformity)

Flexor deformity occurs because of contraction of the deep digital flexor tendon which inserts on the solar aspect of the coffin bone. This condition commonly occurs in foals between the ages of 4 weeks and 4 months old. It can sometimes be seen I new born foals, fast growing weanlings and can occur in older horses secondary to trauma of the flexor tendons. It is easily recognized by examining the angel of the dorsal hoof wall which will be more upright then the angle of the pastern which results in the classic club foot appearance. Treatment of flexor deformity involves surgical and non- surgical methods. Foals receiving excess carbohydrate or protein in their diets should be placed on more balanced diets. Anti-inflammatory drugs may help encourage even weight bearing allowing the tight tendons to stretch. Corrective shoeing, splints, casts and intravenous oxytetracycline all have been used to correct this problem. With severe flexor deformity surgical correction is necessary. With less severe cases cutting the distal check ligament helps correct the problem. With more severe cases such as the mini horse above, severing the deep digital flexor tendon is necessary. Several months after performing surgery and several corrective trimming episodes this mini was walking much better.

 

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