A recent study of coffin bone (distal phalanx) fractures in foals found they were far from rare. In fact, all 20 of the Warmblood foals in the study (all foals on a particular farm in one season) had fractures at some point in their first year of life, for a whopping total of 61 fractures recorded.

At the 2009 American Association of Equine Practitioners convention, held Dec. 6-9 in Las Vegas, Nev., John J. Dascanio, VMD, Dipl. ACT, ABVP, associate professor of Large Animal Clinical Sciences at the Virginia-Maryland Regional College of Veterinary Medicine, discussed the incidence and healing of fractures of the palmar process of the coffin bone in this group of foals.

The palmar processes of the coffin bone within the hoof are slender extensions of bone that project rearward from the bone’s main body. There are seven types of different fracture patterns in the coffin bone; fractures of these processes are classified as Type VII. Previous studies have found Type VII fractures in 19 to 77% of foals studied.

The current study found that nine of the 20 foals studied had large fractures (and sometimes medium and small ones, as well), seven had medium fractures (and sometimes small ones, too), and four had small fractures only. Sixteen foals had fractures in both forefeet, all had medial (inside) fractures on at least one foot, 18 foals had a lateral (outside) fracture, and nine had both medial and lateral fractures in both forefeet. Dascanio reported the small fractures tended to show up later, at an average of 4.2 months of age, while the larger ones occurred at an average of 2.6 months of age

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