This is not quite as bad as an earlier diagnosis seemed to indicate - whether some peripheral calcification has reduced with time, or if there was some error in the first assessment is unclear. The arrows that I have added point to the "cloudy" area of new bone growth related to the injury itself. 

There is reason to hope that this can be repaired. The damage is relatively minor, although it is a somewhat pricey job, and the animal is not experiencing significant discomfort - he only shows lameness when he over-does it.


I am aware that the same "little experts" who I beat up on elsewhere on the site are spreading misinformation about this sort of thing as well. In response to that, here is an exerpt from O.R. Adams' "Lameness in Horses". As old as it is, this remains among the most authorative textbooks that exist.

I underline the part about congenital origin possible "when bilateral and not accompanied by periosteal new bone growth".

'Nuff said, I trust.

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