Are you jumping or just on the floor?
I have been jumping two classes Mon., rest Tues., Wed. 1 session, Thurs. Light jumping my own practice, Fri. 2 classes, Sat., Sun, walk or Total Gym.
My knees made noise when I STARTED TKD. (fragments, bone, cartilage, broken off inside the knee). Well, I don't hear anything anymore, maybe they've smoothed down. :idunno: No, actually, my MRI on my left knee showed that I had worn a divot into the bottom bone. Not good.
If you are swelling up after practice you have inflammation causing synovial fluid to buildup inside your knee, that's your body reaction to the inflammation. If you have little cartilage left, from wearing that cartilage cushion down, bone fragments break off and help cause the irritation and subsequent inflammation. Probably have arthritis too, the way your body trys to compensate for the lack of cartilage, build calcium bony deposits that irritate the situation further and cause pain.
What you can do: Take Glucosamine Sulfate-get a good brand (better than Glucoasamine Chondroitin), MSM, reduces inflammation, religiously for at least three months to see results. Actually, I took it for a couple of years and then I figured why spend this money when I feel great, so I stopped. Didn't take long and I was in agony again and it took awhile to get it back to the previous pain reducing level inside my body. Glucosamine is supposed to help rebuild cartilage. ?? I probably have been wearing it away as fast as I make it anyway. But I do know it makes my knees feel better. This is pretty widely known among the medical community too. Ask you doc the next time. I take the Gluco. early in the morning so it doesn't interfere with the ibuprofen. Can't remember exactly but it doesn't work as well with ibuprofen present. Then I take the 2nd dose at bedtime. I also take Advil or ibuprofen, at least a half hour before jumping to head off the inflammation, swelling effect. After the ibuprofen wears off you will be fine. If you really do hard jumping, ice your knee afterwards or ice it anyway if you want to be good to your knees and save them. I take Dixie cups 4oz.size and fill them up prior and freeze. Peel back the edge and go ice on the skin around the knee-massage a little going round until it feels numb then go on around.
I have other problems with my knees too, side ligaments, hamstring, cartilage torn on one knee but I do exercises, braces for those.
Hope this helps you, its work, but you've really got to be good to your knees.

TW