Cortisone Speed Recovery?

I have developed tendonitis on my right shoulder while benching <too much weight+bad form>. Its been 3 weeks since ive lifted anything at all and have no pain doing daily taks at all until I start lifting again. My dr recommended cortisone shot to treat the pain but I only want to get it if it will speed my recovery time so I can get back into training since I dont have pain to begin with.

I searched the net and all the information that I find is that cortisone reduces inflammation thus reducing pain caused by the tedonitis. I havnt found any evidence that it actually helps aid in recovery. is there any evidence that this steroid can actually help speed recovery time?
thnx,
Mike