Welcome @shep148, I think I might be venting also if I was told not to worry about the numbness after surgery and six years later I still had the symptoms. It was one of the possibilities my surgeon explained to me prior to having my TKR but I already have numb feet and neuropathy so it didn't make mine any worse. In my experience, most foam inserts in shoes are only good for 3 to 4 months max. I like Sketchers because they seem to feel good on the feet and I get the leather like versions for more support than the canvas ones. I normally get a new pair a couple of time a year because the foam sole breaks down.

Seeing a podiatrist might be a good idea to see if orthotics might help. Have you thought about getting a second opinion?