Hi. I am sorry for your difficulties. I had a Mako robotic TKR on my Rt knee, about two months ago. The moment I woke up from surgery my sciatic was so reactive.
Before my surgery I watched several YouTube videos for Mako TKR and traditional TKR... eye opening and cringe worthy stuff. This is a very tough assault on your body. Not just the technical removal of the old and in with the new but the extremely aggressive manner in which they test the strength of your replacement before closing you up. It's as if they are slamming your leg into flexion and side to side, up and down to be sure it all holds. After watching the videos I would have been extremely surprised if I had not had any sciatic pain.
There have been a few points of frustration where I couldn't believe I still had so much pain when my PT would glibly say... what do you expect? they cut off the ends if your bones! 😳
( Then they shake, rattled and rolled them)
In these two months I have come to realize that pains can come and go to varying degrees depending on PT and how much I push myself or whether some nerves decided to wake up and let their presence be known. Ice, CBD lotion massages, moving when I really don't want to... Aleve, Tylenol as needed and resting when needed and whatever else works. Oh did I say ice? Love the ice...
Best of luck finding what works for you. This too shall pass.