I think crutches would be better (and probably easier in most circumstances) than trying to walk on broken bones.

I'm not sure about broken ankles, but with most broken straight bones, you must stabilize both joints on either end of the break.
And, trying to walk on a broken bone can drive the broken ends into a vein or artery, and you'll be bleeding to death, which would make for a short trip. This would also be a danger for those attempting traction splints: stretch the leg to straighten the bones, release the tension and the broken ends jam into a big vein or artery. Oops!

Sue