Dancer- I am not sure if it was at the coffin bone. Laneyās injury was on her RF where the pastern connects to the hoof- we did both xrays and u/s when diagnosing, and her x-rays were OK, the tear was visible on the u/s, but did go into the hoof (which could not be seen via u/s). I chose not to MRI, as the vet felt most of it was visible, and the treatment would be the same.
I am not sure how she did this- vet thinks just a ābad stepā. I have a feeling she possibly had a smaller tear when I purchased her( I had only had her about 5 months before she was injured), No lameness showed up during the PPEā¦but she was not in real work before I bought herā¦w/ harder work, I think it showed up & got worse. I feel this way because she is moving MUCH better now as opposed to when I first bought her, and is much more forward than she has ever been.
There definitely is hopeā¦her tear was very big- 70%ā¦I do baby herā¦never ride in bad footing, push her too hard- and I CRINGE whever she trips or stumbles, I think she recovered faster than I did :lol: I am just so thankful she is finally OK 
BTW- She did have her coffin joint injected towards the end of her re-hab. There was a time when the u/s showed total healing, but she was still a tiny bit lame in tight circles to the leftā¦so vet recommended thisā¦I am not sure if it helped or not, because she also had a different shoeing done around the same time. Like I mentioned earlierā¦I feel squaring off her toe made (and still makes) a huge difference in her movementā¦her foot conformation is not great, she has one heal that is much higher than the other.
Donāt give up hopeā¦I know EXACTLY how you feelā¦I truly believe in the hand walking, SWT, just keep up all of the work, and youāll get here tooā¦I wish you all the best 