Why do pts get #RheumatoidArthritis & also #psoriatic in same jts? Also #psoriasis recurs in same spots. Memory cells, altered permeability of cell membranes? Dunno but neat study shows early RA jt involvement likes to recur in same jts. But can spread! @RheumNow #ACR21 abst#1216 https://t.co/qCORzfhjqH