Following a rupture of my L3/L4 disk in 2000, I developed quite annoying radiculopathy down the right leg. When I touched my knee, it felt almost like concrete, the biofeedback was so weird.
Anyway, necause of a loss of cartilage, I had a partial left knee replacement in 2007. My early rehab surprised the physical therapists (but not the orthopedic surgeon, of course). Then the rehab curve began to level off, then flatten, and then retreat. My neurologist at the time (I have since switched to a neuropathy specialist in NYC)said it was my peripheral neuropathy (caused by vincristine treatment in 1991) that interfered with the rehab. (My current neurologist agrees, but she also agrees with the following.)
One day, while showering, I dropped a nearly full, 12-oz. bottle (plastic, fortunately) of shampoo on my right big toe. It hurt like the devil. Within minutes, the left big toe began hurting, and finally became as painful as the right. When the pain resolved, it resolves at the same pace in both big toes. This caused me to start researching the internet. (Being a retired surgery-journal editor, I'm pretty good at medical research.) When I finally Googled "mirror-image pain," BINGO!
My neurologist and I aren't sure just how to cope with this new discovery, except through the usual CNS-interfering medications. My orthopedic surgeon is mystified that my left knee is now as paionful and unreliable as it was before the replacement.
Anybody want to weigh in?