I think you are referring to your shin? It is very common for the nerves there to be damaged during TKR, and then have to heal and regenerate. The feeling is NOT pleasant. Nerves regenerate very slowly, but over time your brain accepts the feeling and it becomes less noticeable.

One thing does concern me though - you say " or sit at a desk for hours" - at this point in your recovery, whenever you are sitting for more than a few minutes, you ought to be elevating and icing your knee. @johnbishop can tell you about the advice he got from his doc after TKR.

Have you returned to work?
Sue

7 weeks post TKR is still early in the recovery process. I agree with @sueinmn, if you are sitting for hours, you need to figure out a way to elevate the leg and ice it when you are sitting. That was the one thing my surgeon emphasized after my TKR followup meeting with him when I told him I was only elevating the leg several times a day along with icing it. He said if I wasn't walking around and doing something the leg should be elevated during the recovery process. It did help with my recovery.

The one thing you mentioned that I would discuss with my surgeon is the pain only in the shin area. Here's some information on what might be causing the shin pain.

"Nerve pain — During knee replacement surgery, there is a small chance that your peroneal nerve could have been damaged. The peroneal nerve is the nerve that travels down the leg past the knee. If your shin pain is nerve related, it may be accompanied by numbness, itching or tingling sensations."
-- Shin Pain After Knee Replacement: https://totaltherapysolutions.com/shin-pain-after-knee-replacement/

Are you still doing the post op exercises for the TKR at home along with icing and elevating? I think I would discuss the pain with your surgeon?