I'm sorry to hear your TMO migrated and has been so painful. As my name suggests, I had TMO in my left ankle, not in the knee, but I wanted to share a few things.
First, I started with pain in September 2012 and was diagnosed in February 2013 on MRI. I posted here shortly after diagnosis. Your post is the first reply since then, and that's why I wanted to at least reply to you.
Second, my TMO migrated through half of the 26 bones in my foot, evidenced by serial MRIs. My pain has waxed and waned between moderately severe to debilitating for almost three years. This is the first month I can walk reasonably, though still with a limp as the TMO fused a couple of bones and disfigured a few more. I now wear a half to a full size larger shoe on my left foot than my right due to the disfigurement the TMO caused. During the course of nearly 3 years, I was off my foot entirely for 3 months straight, and walked with a cane for almost 2 years. I am grateful to say I finally no longer need the cane. Also, because I was compensating with muscles I didn't normally use to walk, I now have limited range of motion of my right hip. I hope to correct this with yoga or PT soon. I hope by hearing this, you can avoid doing the same (compensating).
Third, I was on a chronic low dose (250 mg) of Depakote (valproic acid) from 1992 until 5 months ago. While the doctor who prescribed it insisted it didn't have anything to do with my TMO, it wasn't until I went off it that the TMO started receding. I now believe it did indeed keep the TMO active. Three years is far longer than any literature I've read regarding duration of TMO attacks. So, if by any chance you are on that medication, I would suggest you talk to your prescribing doc about changing it to a different med. I do not fit the "typical" patient for TMO, i.e., I am an almost 63-year-old female, not a middle-aged male or a pregnant female.
I hope any of this has helped in some way. TMO is insidious, indeed. I will keep you in my thoughts and prayers that you are able to keep your spirits up through the pain and that your course subsides soon (!) and doesn't migrate again. Blessings to you!