I went to the orthopaedic knee replacement post op and all seems well, I just have to be patient while they arrange the second one. But while discussing pain the nurse practitioner said ah you've got RA so you'll know about coping with pain - high pain threshold. And it occurred to me that the brain fog some of us get is part of that, it helps us to edit out the pain. I often have difficulty in saying where my pain is - I just deal with it. It is a horrible background noise and sometimes something happens which makes me cry out in agony. But I do bear it.