minisci tear

I am a 25 year old aerobics instructor. I work out on a daily basis and recently have decided I want to train for a marathon. About a year ago I developed sometimes severe pain in both knees while running/walking down hill. Being an exercise science major I decided to treat myself and came to the conclusion it was tight IT bands. after nearly a year I have started running again and the pain ( not as severe) has returned. I recently had an MRI that showed a lateral meniscus tear in my right knee. If I have the surgery, will I still be able to continue my normal lifestyle of activities or will complications be a part of my life long term?