hi, thank you for giving me an opportunity to answer your query. Yes there are chances that the menisci may get torn again if some portion of it is left inside by the surgeon. As complete removal is most of the time avoided to provide stability to the knee joint. Why dont you take a rest for 3-4 days and start with static quads and hams along with ATM and SLR. Followed by this try strengthening your gluteus muscle and Core muscles. For which your physical therapist will help you for sure. Later on try doing reverse walking slowly as the end part of the quadricep tendon needs little workout which can be achieved by slow revere walking and the knee becomes more focused. Once you get free of pain and all strengthening done, kindly focus with your physical therapist to learn the balancing activity using a rocker bottom board or a wooble board. I am sure you will be benefitted alot. my all cases with ACL reconstruction, i provide highly focused exercises for both the sides of the body and make them physically fit to play, run, step up and take long walks without any signs of pain. I wish you all the best and speedy recovery. Thank you