Yeah, be it 'just' mechanical or systemic laminitis, I have not found this in healthy footed horses either, only in stretched & very thin soled feet. Except for heavy horses.... but then again, I haven't seen it in healthy heavy hooves for a looong time, so perhaps perception was the issue back then & I hadn't recognised fully what was going on with those....
TBH, I can't actually recall hearing anything specific on that front. I must ask some of my cronies! I have taken it that the hooves need more support under P3 & would strongly consider leaving the 'bar material' in that area but padding the feet, to more evenly load the rest of the sole & frog comfortably, without undue pressure on that bit.
Funny you should bring up the thoughts in your second paragraph
Awhile back, I was hesitant to try the farrier's suggestion of glue-on shoes and liquid packing. I put Joker back in boots, instead and I am kicking myself for that mess-up on my part ( "mess" is not the word I want to use:(
Two weeks ago she put Joker in a model of Natural Balance shoes. She glued them on but also put two nails in each shoe for security. She filled the hooves (both fronts) with vettec's Equithane CS (copper Sulfate). It took 1-3/4 tubes to fill both hooves.
I am mind boggled at the 300% improvement
in how well Joker moves. While this type of hoof pack is supposed to help the soul regenerate, I'm not holding out hope, as Joker's founder was severe. The credible articles I've read seem to think cases like Joker will never have hooves like they once had, there's just too much damage inside.
This venture isn't cheap either. My farrier only charged me cost to do the work and that was $144, plus $40 to trim all fours. I paid her more than that. I've seen comments on other forums of the price running $250 - $350 just for the fronts.
I'm not sure how many times this kind of hoof rehab can be repeated before it becomes counter-productive, if the soles don't regenerate. That's a conversation we will have when the farrier comes back. Back to Chance.
. Having seen this same "bruising" under Joker's bars, I agree it would be best to leave the bars serve as padding, in this instance, and also somehow pad the hooves with a type of strong & flexible padding inside boots.