GH and steroids can rebuild and strengthen muscle and connective tissue. At the same
time they may make that very same connective tissue more vulnerable to a tear. Some
of the nerve impingment problems of say Coleman may have been due to GH too. I think
some MD wrote about that a while ago in MD mag.
Someone I know had nerve impingent and had neck surgery as a result. She asked me if it was safe to go back on GH during the recovery process to help heal faster. I said I really don't have any idea and didn't dare to recommend anything, there might be some undesirable swelling causing nerve problems, to ask the doc. She asked the doc and the doc said the same thing, they wouldn't recommend it in case of some swelling.
Like BB said, there's going to be wear and tear. Doesn't matter if you train "correctly" or "light" either. For example, most lifters have had shoulder problems to different degrees.