Some time back on a group backpacking/kayaking trip I took several jolts to my knee and sprained the lateral collateral ligament on the route down. It was about an hour back to the vehicle so others picked up my pack and humped it back down while I gingerly walked with the assistance of my walking stick. After some RICE I was able to continue for the rest of the 3-week trip but I had to be careful about putting weight or pressure on that knee and could only use a small day pack. Lucky for me that the heaviest work was out of the way and I was able to continue. Unfortunately I didn't have access to a brace or elastic bandage which could have helped.

My point is - the original question has too many variables in it. Distance to be traveled, terrain, # of companions, and type of injury were the biggest factors for me. A broken arm or a deep laceration or concussion are all very different scenarios.