What is your knee motion, flexion and extension (assisted or unassisted?). What helped me a lot was getting a knee glide device- well worth the $80 I spend and wish i would have had it from day one. In bed, I used a garbage bag to make the surface slippery and easier to slide on.
I am a PT (if that matters at all) and I have see swelling last a long time but what helps a lot is to watch the static standing, in place and it's important to continue to ice. I iced for many weeks after I returned to work and had this written in my return to work instructions. .
Don't be in too much of a rush to get rid of an assistive device- at 4 weeks I went to a cane for outside and still used a walker inside; when I went back to work, I used a cane for several weeks and gradually went off that. I took myself off the pain meds at 4 weeks to allow driving. Which ironically, my pain level wasn't any different (no worse, no better without the strong narcotics). For me, ice has been the best way to manage the pain.And I still use it 2 years later as still struggling with some pain.