Surgery question

hey nite moves what can i do for pain of arthritis (think i spelled that right)thats the reason i have to have my shoulder replaced.. like i said i have pain everyday some days are worst then other like a nail being drove down my bone to the point i have to close my eyes for a few sec. in my mri the bone looks almost black was told its called a old man shoulder.. im just 39 mike..

sorry not trying to hi jack post...thanks mike