My TKR was 7 wks ago. After original discomfort I do pretty well and don’t have much pain during the day at all. I’ve been released from physical therapy and have no problem getting around except for doing stairs are still very difficult. But, I am having excruciating pain in the inside of the back of my knee when I lay down at night. Have any of you experienced this and have any indication to what causes it or how to stop it.