I am thinking like you, my foot still 50% numb after TKR 15 months ago, NO CHANGE. I could use a new knee on the other leg but fear consequences, (nerve damage). Bottom line, you take a big chance with this TKR but they won't tell you that, not good for business. I still believe if the orthopedic surgeons took more care instead of doing two or three knees before lunch there would be less nerve complaints, but that would be bad for their bottom line.
I talked to a neuro surgeon about my numb foot and what the orthopedic surgeon did, he just put his head down and shook it. Good luck pal we both need it.