dbmata, the OP is asking for advice on wether or not HGH will benefit his situation after the fact. He's nine months post op, with built up scar tissue, and a possible frozen shoulder. Will HGH help his shoulder mobility, reduce his scar tissue, and increase his range of motion?
I do not believe so.
Specifically to your question, I do not believe HGH would have prevented buildup of scar tissue in my case. My frozen shoulder was caused by following my surgeon's conservative PT protocol, beginning with 8 weeks in a sling, and very limited movement. As I see it, the function of HGH does not prevent the formation of scar tissue.
If your research reveals otherwise, I'd be interested to know.