I had a micro fracture on my knee last summer 2012. I went to physical therapy for 5-6 months. But my knee has not been the same. Whats wrong with it?

?? By micro fracture do you mean a "micro fracture arthroplasty " if so you are pretty young for such things but it is not unheard of unfortunately by no means does all surgery work go discuss with your orthopedist.