The problem with Troup is not "can they fix him," but rather, "can they fix him well enough to allow his back to continue enduring the extreme force and pressure that someone in the trenches will constantly face?"
I don't know for sure, of course, but I'd say the odds are squarely against it. Even if he does make it back (ahem), the question will always be, "okay, but for how long?"
It's a little bit like the Peyton Manning situation -- sure, his neck can be fixed to the point where he can throw a nice ball again, but how well and how long will it hold up to the equivalent of Marcell Dareus blindsiding him or falling on top of him a few times every week?