My TKR was Feb 12, 2019 & I too woke up to a numb & tingly foot. Found out thru an ABI the surgeon pinched off my popliteal artery, which I had to have a vascular surgeon open. I am find out now that I have nerve damage fro the TKR surgery. TKR surgeon told me I could of lost my leg and why did I wait 60 to get it fixed. He was the one who told me it was normal and give it a year or two. I wish you all the best and hope you find answers.