My knee cap is floating since i sprained my knee. most of the swelling is gone, but some remains?

See ORS: Not sure the severity of your knee sprain w/o more history or a physical exam.If u had signifigant swelling and it is now reduced and u feel like your kneecap is "floating" it sounds like u still have an effusion( ( joint fluid) and may have sustained a serious knee injury. ( acl , meniscus tear, patellar dislocation w/ loose body, etc.)see a board certified orthopedic surgeon. Good luck!

Can last a long time: Pain and swelling may last a long time following any injury. Have it evaluated by you orthopedist and get the appropriate treatment to avoid future complications.

Can last awhile: Ice elevation and rest and see an orthopedic surgeon to make sure there is not another cause and that there isproper healing to avoid complications.