So I should talk to my vet about whats going on 'inside' the hoof?
But if the coffin bone is tipped and has been worn off there is nothing I can do about that anyway? Right?
Measuring the collateral groove depth will give you a good idea of sole thickness and also the position that the coffin bone is in. But to be absolutely for sure of what it looks like you would need to talk with your vet and get some x-ray's.
And yeah, unfortunately once the bone has been worn down it won't grow back, at least not with our current technology that we have access to. (For more info on that subject then I'd say start with this book, "The Body Electric", by Robert Becker, he's done experiments growing bone and growing limbs) But the hoof can be corrected and the coffin bone can be grown back into its proper positon. And that would stop any wearing of the coffin bone, if it were wearing in the first place. But I wanna mention here that I don't know if the tip of the coffin bone has been worn or not. I was just noting that there's a possibility, and that if it has happened then it's fixable to a point.
And if you mention your location, "I can't see currently if you have it listed in your name area", then maybe someone will know of a local barefoot trimmer in your area that has experience.
And here's some websites that have some good information and articles worth reading on the barefoot horse.
Healthy Hoof - Solutions for Barefoot Performance
The Horse's Hoof, News for Barefoot Hoofcare
Pete Ramey hoof care heals founder in horse’s navicular disease farrier
Barefoot for Soundness