I didn't really mention intern year because you only do 1 or 2 months of ortho and the rest gen surg. Don't remember. Your second year is when your ortho residency starts. That's when you're an "ortho resident" in my eyes. During your second year, joints and spine you're in the OR a lot but not doing much. The rest of the rotations like hand, sports, peds are good. So maybe more than half the rotations. When I say not operating, I mean you're not doing the case. You're assisting the attending which can range any thing from holding hook to having the attending walk you through cuts of a total knee. It's never like you're doing a total joint when your attending's watch.
It's a great program. If you're looking at Chicago programs, NW and Rush are pretty much top 2 with Rush being more research oriented and NW being more clinical oriented. Other good programs you should consider in midwest are Michigan, Wisconsin, MCW, and Iowa and Loyola.
Just so you are aware, surgical subspecialty doesn't mean you're operating 5 days a week your whole career. Most orthopaedic and orther surgical specialty attendings operate maybe 2-3 days a week tops. So, ask about a program's clinic experience when you interview because you'll spend half of your career in clinic so you need to learn how to evaluate patients.
My advice for picking residency is choose a well rounded program that will get you to the next step in a location that you want. Location should be the most important. Every program is reviewed by ACGME for site visits and these visits involve resident interviews. So most residency programs, believe it or not, do whats best for the resident to keep them happy. If you are not operating at a residency, residents could complain to ACGME which is a big deal. >90% of programs will provide you a great eduction from an operative standpoint.
Good luck.