I was hopping up stairs with crutches one day after having ankle surgery. I tripped, fell, and dislocated my shoulder. That is the worst feeling in the world. It feels like your arm has been ripped off or something. It took 3 doctors to pop it back into place.
I had to get a wheelchair because I had to stay off my ankle for 8 weeks and my arm had to be in a sling for 6 weeks. Bad way to spend a highschool summer break.