I has a damaged ACL, I thought it was torn, but it was permanently outstretched. It took me three years, no surgery.. It kept popping out, was totally loose. I could sit in an office chair, turn to get my coffee, and the shinbone would remain in place as the knee popped.. was really gross. :P
So here's what I did: I got some really light weights, fastened them to the foot, sat on a chair, and did reps each day, light weights. I did this for a year. Then I started rolling again. Turned out my knees had gotten better, and rolling made them stronger. Jogging however seemed to make them weaker. Then I took up weightlifting strongman style, mainly dead lifts, and that really made them strong. Now my knees are healthier than ever! But if your doctor recommends surgery, I'd take his advice over mine. All injuries are different, and I'm not you. But I would recommend light weight training in the beginning, not jogging. A physiotherapist could probably give you great advice on what kind of weights to use and how much.
So here's what I did: I got some really light weights, fastened them to the foot, sat on a chair, and did reps each day, light weights. I did this for a year. Then I started rolling again. Turned out my knees had gotten better, and rolling made them stronger. Jogging however seemed to make them weaker. Then I took up weightlifting strongman style, mainly dead lifts, and that really made them strong. Now my knees are healthier than ever! But if your doctor recommends surgery, I'd take his advice over mine. All injuries are different, and I'm not you. But I would recommend light weight training in the beginning, not jogging. A physiotherapist could probably give you great advice on what kind of weights to use and how much.