Accomodations don't exist. There is no way to make the kind of contact that happens on every down of football, from lineman crashing into each other, QBs getting sacked from behind, linebackers crashing into running backs for tackles, safe. There is this misconception that it's just helmet to helmet hits that caise CTE. It's every part of the game. The human body was not built to do what is asked for it in the course of a football game.
Nor is it for boxing, mma, pitching in baseball, can probably name others but there's no point.