Hi, Renee, and welcome to our little "family." I'm sorry I've been so late in getting back to you...but when you first posted here, I was stuck in the hospital myself, going through my own little adventure in living with a badly swollen stump. Have all the incisions from your last amputation surgery now healed? Is there swelling on your stump itself, or just on the side with the broken knee? (I'm assuming here that your amputation is on your left side, and that you might have put an unusual amount of stress and strain on your right leg, leading to the broken right knee...does that sound possible to you, or am I mistaken?)
Swelling can be such a frustrating problem, in part because it is so hard to diagnose and just seems to take its own darn time to resolve itself. I know that my swollen stump drove me crazy! Try to keep yourself occupied as much as possible...if you're not wearing an elastic bandage on your knee, ask your doctor about doing so and have someone show you how to properly wrap it. Elevate your knee as much as possible, too...keeping it above the level of your heart can help with swelling. So can ice. I know that doesn't sound all that exciting...but getting you healthy enough to start "rehabbing" is a good goal.
And speaking of Physio...at the very least they should be working with you to keep the rest of your muscles and joint strong enough to help you during your recovery. You may have to be very assertive about your needs through all of this...amputees in general are not particularly common, and amps with complications sometimes just leave health care workers "flummoxed." Do all you can to advocate for yourself........I'm pulling for you!