I was pretty tired last night so I only gave those links. I'll try to give a little more info today.
You can also google James Rooney and Dr Robert Bowker you may need to add the word navicular when you search those names to help refine the search.
Here's a few links to people with success stories regarding navicular. Healthy Hoof - Solutions for Barefoot Performance Healthy Hoof - Solutions for Barefoot Performance Beau, A “Navicular” Story Healthy Hoof - Solutions for Barefoot Performance Healthy Hoof - Solutions for Barefoot Performance
All those links came from just this one site. healthyhoof
So there are lots more success stories out there.
In a nutshell, to bring a horse comfort and stop the damage of navicular, the horse needs to have heel first landings to develop the rear of the hoof. And that's a bit of a catch-22, cus how do you get a horse that's avoiding the back of it's hoof to land heel first......
Really it's not that complicated. Proper barefoot trim, get rid of any/all thrush, and set the horse up in boots AND pads. The boots are great, but the real magical worker to get the horse to use the back of it's hoof is using pads in the boots.
Using boots and pads will make the horse comfortable enough to have proper heel first landings. And with lots of heel first landings the hoof can begin to rehabilitate and develop the back of the hoof. Once the horse is having proper heel first landings the lateral cartilages and digital cushion will begin to "grow" to the size and density it needs to be. Once the back of the hoof begins to develop into what it should be for an adult horse you can begin to transition the boots and pads out.