Hi sambles,

I'm sorry for your predicament. Sciatic pain is usually very different from the pain you'll fell in recovery from a TKR. It's hard to tell for sure. That looks like a picture of a swollen knee. Three weeks out it should not be that swollen. Did you do all the post-op stretches and exercises? Are you elevating the knee above your heart and icing? are you taking or have you been prescribed something for inflammation (Rx like Celebrex, or NSAID like Aleve OTC)?

Joe