Welcome Shelbye! And welcome back Walkin - good to see you here again!
Rads revealed just a very thin sole and was told that was the source of lameness. No sign of bone infection, rotation or infection. Over the next few days horse became grade 10 lame. Had farrier out who discovered a MASSIVE infection. This sucker sprayed everywhere once dug out again at the toe. We thought FINALLY the source had been released and with plenty of cleanings, topicals (seriously Iíve used everything possible from clean track to simple Epsom salts, betadine etc.) and keeping it sterile via a boot we would be out of the woods... not so much
So 'just' a very thin sole huh? Why is it so thin? What is being done to address this? What is being done to protect that sole(well, what's above it) from further injury? It's common for extremely thin soles to abscess repeatedly, where pressure is constantly on the live tissue between bone & ground. While 'opening up' an abscess may well be necessary, it is then effectively a surgical wound on the base of the foot, so you're right, it needs intensive care, to be kept sterile and treated topically to prevent further infection until it's healed.
You can look at the abscesses of being 'just a symptom' of the thin soles, which may be due purely to mechanics, or may be due to ongoing systemic laminitis as well - from IR or such, as Walkin mentioned. So those factors need to be addressed for the problem to begin to improve. Even if the vet is sure there is no bone or deeper infection, I would strongly consider another opinion & IV antibiotics.
**Unfortunately, many disinfectants, such as betadine, will *inhibit* healing by damaging & retarding the live tissue. So it's a balancing act, to keep infection at bay but not do further damage. I believe this is the reason vets have declared probs such as pedal bone penetration are incurable. Because with normal disinfectants, it becomes so. Whereas, believe it or not, something like raw Manuka honey applied to the wound can do the job very well, and *promote* healing! It's possible that your 'after care' may have been problematic in this way.
Those pics show quite a long, stretched toe, which will be part of the prob. Not sure about excessively thin soles from those pics. If you'd like more specific info, see the link in my signature & post a full compliment of appropriate photos, and it would also help if you can include the rads.