Abstract Number: 560 • 2014 ACR/ARHP Annual Meeting
High Sensitivity of the ASAS Classification Criteria in Patients with HLA-B27 Positive Undifferentiated Spondyloarthritis with Onset of Disease after Age 45
Background/Purpose: The spondyloarthritis (SpA) complex also includes forms that do not meet criteria for the definite forms and are called undifferentiated SpA (uSpA). Recently the…