#ACR23 Abs #0844 posterior element inflammation & facet joint ankylosis on MRI uncommon in r-axSpA patients. However, when FJ inflammation is present (vs w/o) the likelihood of developing facet joint ankylosis after 1 year is over 3 x higher. https://t.co/1Kln1pNH3p @rheumnow https://t.co/BatNTFfTG2