ICYMI: The Sacroiliac Joint - some call this a symphysis, but it is an "amphiarthrosis", or sliding joint, with minimal movement; Only the lower 1/3 of the joint is synovial lined -- this is where one should look for sacroiliitis. https://t.co/8uD13h2qHZ https://t.co/D3UERVXrgX https://t.co/2DToXTQCi5