There are medical professionals who post on hornfans, but I'll take a stab at the question about arthroscopic knee surgery.
It depends on what they had to repair. I don't think you can do a major ligament repair with a scope. My guess is that he will be able to work out and run before the semester is over.
But that is a layman's estimate.
Overall, this is a pretty good spring report. I hope these guys all come out fine in their different travails, and I bet that they do.