In my case, I believe the numbness and tingling is a result of TKR surgery. My knee joint was severely damaged, so in addition to replacing the knee joint the surgeon had to straighten my leg bone. He moved the nerves around the bone so he could shave the bone to correct my gait. I was warned before surgery that there was a risk (15%) that this part of the surgery could damage the nerves and result in a club foot. Very scary. Thankfully, that didn’t happen. But the fact that there was a risk of it happening tells me the nerves in my leg were likely traumatized to some extent. Also, as my gait has corrected itself, I have dealt with pysatic nerve pain. Yes, I believe the nerve problems in my legs and feet are connected to my TKR surgery. I think it's a risk everyone takes when they have that surgery. Most people do well. Some struggle with after effects. I hope you find some answers and relief.