Once an ACL's repaired, it's good as new, stability-wise. The things limiting Gallardo are his strength, flexibility, and the fact that he hasn't been pitching. My wife had her ACL reconstructed in March. Her strength and flexibility were really close to 100% in a couple of months. Pain's still an issue for her, but that's because they had to rip out her patellar tendon instead of using a tendon from a cadaver like most ACL's these days are done.