Hi, I have found ,by following patients on Bone Smart and doing a lot of reading that the "rubber band" feeling is quite normal. I had bilateral and myy right knee has always been ahead of the left in recovery, and feels 99% normal after only 5 months. I have been told, and believe, that the tight band feeling, in my left le, is due to remaining swelling on the inside. I believe it because when I am off of them, and put them up, even for a short time, this feeling subsides a great deal. A month ago this included my left thigh muscle, on the front, and is now gone. Every day, every week, I see any "weird" feelings in my knees disappearing. My surgeon said I have to allow a year before they will feel normal, and like they are part of me. I believe him. As promised to my grandaughters before I got my "new knees", I actually went to the Mickey's Very Merry Christmas at the Magic Kindom, at three months out, and walked the entire time and was completely amazed; tired and sore for a few days but thrilled. Hang in there, do the exercises and therapy; very important. BLTKR 9/13/11.