Good news, Raider Nation -- broken leg expert Joe Theismann says he's 100% confident Derek Carr can rebound from his fractured fibula ... he knows from experience.
We got the Super Bowl champ out in NYC earlier Tuesday where he told us he was brokenhearted for the Raiders QB ... and knows first hand what it's like to recover from that same exact injury.
Yeah, turns out Thiesmann broke his leg more than decade BEFORE that infamous run in with Lawrence Taylor in 1985 (that gruesome compound fracture on MNF) .