My vet would like to do an MRI, and I would too, mostly to see exactly where the problem is and just how bad it is because that might give us some idea of long-term prognosis. However, nobody can accurately predict the future, so even if he has a giant tear somewhere for the second time, it's possible that he could come back 100% and as long as I keep him on good footing, he's sound for the rest of his life. Or he might never be sound again. Who knows, it's a crap shoot either way.
So, you guys know the drill for soft tissue injuries. A month off with limited turnout, a month of tack walking once he's sound at the walk, then work him back up. Three months minimum, all the while desperately crossing your fingers that he doesn't re-injure it. Then waiting each ride to see if he'll hold up or not.
Don't worry, he still gets most of the cookies.
On the bright side, I have a Brego to ride. I'm really looking forward to it, although I could wish it was under different circumstances. He's very talented and has a ton of training, I'm just going to have to remind him of that. Our first lesson is tonight, and I expect to be doing lots of energizing walk-trot transitions (thanks, Megan!)