Daj, you can do some physical therapy in the pool too. I used to walk across the pool with the water at breast level, maybe six times, then backwards, then sideways and sideways again--the other side!! Then, I would walk across the pool lifting my legs high so that the knee is almost out of the water.
Then I would put on a flotation belt--or use a pool "Noodle" and "run" in the pool in the deep end. I could run with short strokes or long--fast or loping. I did this quite a lot in the beginning and my knee did not get swollen in the pool. So, I could do a harder work out and not get swelling--the pressure of the water helped the knee, so that it did not get swollen.