Anything that Nandrolone does for joints. GH does better.
As far as the vascular system goes, that is nothing proven in practice. In all due respect to Lex, he is referring to a study that everyone one talks about. While the particular facts of that study are true, that was not a comprehensive study, and it didn't explain why this happened.
Taking Testosterone with Nandrolone may ameliorate this problem such as the other side effects. That study was a simple study performed only with Nandrolone. And we don't know enough from it yet to draw any conclusions.
I'm sure that I'm not as good of a bodybuilder as Lex, but this is the type of critical theory that I can share with you.