I had posterior TJR in 2018. I have the same symptoms as you. I just completed a battery of tests to determine the cause of my pain. I no longer really exert myself to avoid the intense pain. But just doing regular housekeeping activities triggers the pain for me. I am still steady on my feet but long walks, periods of standing or sitting trigger the pain. The doctors could find nothing wrong with me. They have sent me to PT for core, hip and glut strengthening. I just am in my second week of that. It is very frustrating. Especially getting people to believe me.