Broken arm won’t keep Panthers’ Davis off field Rams defensive end Jack Youngblood played throughout the 1979 playoffs and Super Bowl XIV with a broken leg. [...] you know Youngblood loves what Panthers linebacker Thomas Davis is doing Sunday. Davis is playing with a broken arm — after already having come back from three torn ACL injuries. He is a leader on that team and he wants to contribute in what is their biggest game yet. [...] he may never be in this situation again, on this stage with this much riding on the line — that’s what was going through my mind. Davis, like Youngblood a team captain, will start Sunday after breaking his right forearm in the NFC Championship Game two weeks ago. Davis, 32, has had some bad luck in his career — the three ACL surgeries in 2009, 2010 and 2011 that many thought would end his career — but has worked hard to be a Pro Bowl linebacker who often covers running backs when they go out for a pass. When he broke his arm, Davis thought that his season, a magical 17-1 ride thus far, was over. [...] as Panthers cornerback Robert McClain said, modern medicine. Panthers coach Ron Rivera said Davis looked really good in practice in the past week. Davis is one of Rivera’s favorite players — the coach choked up at a news conference after Davis’ third knee injury.