Steffi, it is most peculiar what different drugs will do to different people. My feet began to swell when I stopped taking Amantadine, and until I took it again last week my feet looked as if they had been blown up like balloons, even the toes were swollen. Now the swelling is all but gone, and I have ankles again - they're going to start turning purple, but at least they're not swollen. It could be the Amantadine that's 'blowing up' your knees. I know Teresa stopped taking it because she was tired of not fitting shoes and not having a proper waist line while taking it.
I think both PD and the medicines we take can cause strange swellings and equally strange disappearances of swellings - they're shape-changing, from feet to knees to hips to waist line to hands to face. You never know what to expect.
It's only funny when the swelling has gone away again.

birte