I know you posted several months ago with your husband having hbot, debridment, so not sure where you stand now or what concerns you may have. There are different grades of ORN 1-3, with stage 1 and 2 treated conservatively with hbot, debridment, antibiotics, pentfoxyline (spell) & vitamin E, in a stepwise manner, depending on grade. There are some trials with stem cells too for ORN, which look promising.
Christine offered sound advise. I'm on the east coast, so I'm not familiar with anyone in the Midwest.
Good luck