The term spondyloarthritis (SpA) encompasses a spectrum of related inflammatory conditions with a predominance of either axial or peripheral manifestations.1 The figure illustrates the individual diseases within the SpA family spectrum (Figure 1).2
Patients with axial SpA (axSpA) have inflammation in the sacroiliac joints (SIJs) and/or the spine.2
Non-radiographic axSpA (nr-axSpA) comprises a subset of patients with axSpA who have no definitive structural damage to the SIJ evident on x-ray (Figure 2).2
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