I am not a doctor and no expert on this subject but I am about to have "ear" surgery on April 6th in NYC. The type of "ear" surgery that I'm going to have is limited to (the best) only two hospitals in the U.S.
To get any type of qualified answer on this forum you might want to give more details on what type of ear surgery is needed.
Good luck with your boy's surgery.
P.S. as to where to ask--I would start with a google search and hope that might point you in the right direction.