Four phenotypes of chronic back pain suspicious of axial spondyloarthritis (axSpA) in the SPACE cohort. These groups wer

Four phenotypes of chronic back pain suspicious of axial spondyloarthritis (axSpA) in the SPACE cohort. These groups were: They were “axial”, “axSpA with peripheral signs”, “at risk” and “no SpA”. Over a 2 year follow up, Transitions between the four classes over two years were… https://t.co/lF1wtAo46Q https://t.co/BXj1nw0tto