Whatever you do, I would not do a standard microfracture procedure. I would look for a surgeon at the forefront of treating OCDs--that means moving beyond standard microfracture (which just uses your own blood to form a clot over the defect) and looking into newer "microfracture plus" procedures such as Denovo, Biocartilage, and/or BMAC. These procedures are designed to enhance microfracture by forming better quality new tissue.
I don't think you can go wrong by going to HSS. I wouldn't do anything without talking to them first, at least.