I had a meniscus removal/repair last July. I had a pretty severe tear and had it operated on close to the time of injury. The procedure was fairly quick (30 minutes so I am told, as I was put out) and I was back on my feet in a day or two. Once the stitches came out I started back into exercise by riding a bike and swimming. 4 weeks after surgery I returned to full activity (grappling and lifting). So far so good.
The doctor recommended to go to a rehab place. I spoke with several friends who are MD's or therapists to get their opinions. After doing so I decided to forgo formal therapy and do my own. It included more bike, swimming, easy rowing and movements/stretches to regain range of motion. It was this same doctor who also advised against squatting.
Hope this helps