Now that you mention it, I feel more depressed thinking about it.make-shift splints, hunting for food, herbal remedies, etc could have filled have done the job. Something along the lines of Alone in the Dark/MGS3 would have made sense and fit into the supposed survival gameplay that the game is said to contain. So far it looks like they really mucked this whole thing up.
Guess all those splints and stuff in promotional shots are all plot-based.