Yes, slip and fall verboten! You can walk/jog parking lots or ice-free surfaces. There's a 2 mile loop
around Bow HS and the elementary and middle schools - always plowed with one road crossing. So for any running when there's snow & ice, this is virtual peace assured. Preparing for the Boston marathon in Newton in the 70s with ice/snow & traffic was often trying! The link is to a screen shot. G maps pedometer screens were ad free in the past. I used to use it quite a bit.
I know Sharon Crawford orienteered with a sling. I think it was a fractured humerus (would have to have been a hairline fx). Falling was verboten. I think she was successful. She's certainly long healed.