I have that same issue with my knee feeling like a rubber band is around it after 12 weeks after a reversion knee surgery. Doctor put my new knee part from almost top of my leg to my ankle. Did not tell me till my 6 week check up. Then he was like it might take up to 6 months to a year to heel. My knee still hurts so bad. It burns like fire I cannot stand anything touching it. Measure yesterday around knee. It still has 1.5 to 2 inches of swelling from knee to my foot. How do you get the swelling down. I don’t sleep at night because of the pain. Don’t want to go anywhere. I do my exercises. Not everyday. Even do extra and ride my exercise bike.