Interesting article, but I'd bet a big part of the reason physicians don't know it's that do much is dependent upon information that lives "out of the system".
How much time will a patient spend on rehab, and will they actually perform the exercises effectively? What's their diet like, not just calories in but in terms of individual nutrients? How active is their lifestyle?
Recovery time seems like something that should be knowable by educated doctors, but the best poker player in the world can't tell you what card is coming up on the river.
