Amendola's a tough one to label. That could go either way depending on what one's definition of "injury prone" really is. He's had the elbow, ankle, shoulder, foot, concussion and now groin. Since none of them are duplicate injuries, I can see how one would say he's not as prone as say, Alexander, who was constantly out with the same exact injury. Hence, he was 'prone' to reinjure it. But Amendola has missed a lot of time, successively, over the course of his career after 2010. He's also kinda small though and is reckless to a fault relative to his style of play.
But Bradford? Nah. He's not any more prone to injury than any other QB in the league.