Mine didn't go away after surgery. I'm not super surprised though, as I have a tendency to swell, plus I had loads of scarring from 7 previous surgeries on that knee. I was told all of that can lead to trouble with fluid moving/flowing back to where it should be. My surgeon isn't too concerned (as of my 6 month checkup last November), but I agree with you---It inhibits my range and changes sizes every week (ha)!!! It all depends on my activity. I keep hoping it decreases for good by the 1-yr mark.