Please, please don't push hard on those stretches so soon after surgery! All that swelling is a sign of inflammation. That's necessary in order for all the wounds to heal. You must not aggravate the wounds and interfere with the healing process. It does not matter what anyone else's knee is doing. It's not a competition or a race. You have 4 months to get the swelling to subside so you can bend your knee. At that point the wounds should have matured. Yes, it takes that long to heal. Don't let any physical therapist tell you there is a rush, or that you won't walk again, or that the doctor will forcibly rip your leg muscles to break the scar tissue. It's bullying and it's not correct most of the time. Once the swelling is gone your knee will probably bend just fine. Keep icing, elevating, and GENTLY moving your knee half a dozen times a day. Take naps. Read a book while you are prone for ice and elevation. They are the best help you can have. Don't panic. If you push too hard for too long you might end up like me, with multiple muscle injuries, more inflammation, worse swelling, loss of range of motion, bursitis, depression, and a much longer and much more painful road to recovery. Good luck to you . I do understand the fear and anxiety.