not trying to be a bummer, but my mom had knee surgery over a year ago, and had lots of complications. the doctor didnt give her a good stretching schedule and the scar tissue locked it up pretty quick, so she had to go to physical therapy, and they had a HUGE guy push her knee until all of the scar tissue tore, so it could re-start healing.
she is glad she did it, just a long recovery. ITs weird because i can tap her knee still after a year and she cant feel it.