Was it not Jack Youngblood who played in the playoffs, Super Bowl, and pro Bowl with a broken leg?

Witten with his spleen.
Don Meridith and his puntured lung, broken rib and pneumonia
John Runyan
Dobler
Deacon Jones
Jim Marshall had a shotgun wound
Ronnie Lott had his pinkie amputated among many other injuries
Emmitt
McNair
Lawrence Taylor
Ray Lewis
Unitas
Favre
Butkus

I mean the list goes on and on and most of these players played more physical positions than QB. Playing injured isn't something new to the sport when the sport is a violent one.