I have RSD in my left leg, until very recently (within the past two months) exclusively in my knee, give or take a little. Had it for four-five years now. Lately it has manifested as a pain first in the top of my foot, like a nail being driven into it, and then I had pains right where my buttock meets my leg. As these pains are comin' and goin', not in any way a constant thing, I am still praying it stays in the left knee and nowhere else. There have been several times where I had mirror pains in my right leg as well, scares me, but these are few and far between, within the same two month period of time, maybe three or four times. These only happen after work, tired and I figured it's just overuse, not used to the amount of lifting, ya know?