IoA is not really the best park for someone with mobility issues. When I was there with my broken leg, I really only did 3 attractions:
Posideon's - stayed in wc, but had many people try to stnd directly in front of me so that they could be the closest to the action
Sinbad's - show, so it ws fine
Cat in the Hat - went through exit and was able to keep wc for boarding.
I probably could have done Spiderman, but I didn't remember if there was a lot of legroom and with the humidity and swelling, bending my knee was a problem, so I skipped this ride.
Universal was a lot better. There is nothing with a conveyor belt like Disney so the loading is always at your own pace. Most of the attractions here are shows so you really don't have a problem if you have a wc.
The Mummy has certain cars that they know are returning to the one side so if you cannot do stairs, you can ride that one. I was able to fit in this with my cast just fine, although my broken leg was not resting on the floor (purposely). There are also elevators and such that will help you get to the riding platforms.
There were a couple of rides that we didn't do due to some bad rain storms and running out of time, but I did mos tof the larger rides at Universal.
If you need any specifics, I would be glad to help.