HI Chelsea86,

I've given a couple of replies to knee reconstructions lately. Check out the patient questions section of the forum - acl rupture question, there's some information in there that might help you. Generally expect to be returning to light impact work after about 6 months post-op and sport specific exercises about 9-12 months. Depends on what sport, how you're going with the rehab and your physio's program of rehab exercises, how fit you were pre-op, how long you had to wait between injury and operation etc etc... many many variables there.

There's a lovely little frustrating period in ACL reconstruction rehab which is where the new ligament is still remodelling into it's final home but while this process is happening it's at it's most vulnerable for re-rupture, but at the same time your muscles are coming back online nicely... so this means you feel like you can start running and impact work and returning to sport.but you really shouldn't!!! this window of frustration is around 3-6 months so be careful in the upcoming months to do your rehab exercises completely but try not to get ahead of yourself. This is a good time to join a gym and do all your upper body, cardio on bikes and elliptical trainers, and get fit without risking knee damage. then, when your physio/surgeon's protocol decides, you can start some more impact work.
Good Luck.
msk101