Ok, so Yovani Gallardo's having knee surgery. Yes, it sounds bad at first, but it's really not so bad once you hear the details.
First, it's torn cartilage. Ok, nobody's happy about that, but it's not the end of the world. He'll have arthroscopic knee surgery next week (two small holes just under and on each side of the kneecap) on Tuesday assuming the swelling's down enough, then he should be walking again without crutches around Friday or Saturday. It takes about 3-4 weeks to be truly safe from re-damaging the cartilage, but after that he should be fine. The rehab should be pretty easy. The only concern would be if he falls too far behind in spring training, and he might miss a week or two of the season as a result of not being ready.
That's not a bad thing. I repeat, missing four weeks of spring training and two weeks of the season is not a bad thing. Not for the Brewers. Not for Yovani Gallardo. He's a young pitcher. He pitched a few too many innings last year, so he's already an injury risk. This will reduce the number of innings he pitch by about 20, plus he'll reduce his spring training work load by four weeks. I already feel like spring training is too long for most young pitchers (I'm concerned by how long the Yankees' trio has been pitching already this winter), so the reduced workload should be good for his arm in the long run.