Interesting Medscape info on HBO. It suggests improved fibroblast and collagen synthesis and angiogenesis. But just because a therapy helps in problem cases doesn't mean it helps in normal cases. Also, comparing real HOT to mild lower-pressure is iffy. I'm skeptical, but my surgeon says it helps patients recover (and he recommends an outside facility so isn't profiting); I'm inclined to try it, but wish I had more confidence in it.