Abstract
Psoriatic arthritis (PsA) is a chronic inflammatory disease affecting the musculoskeletal system, skin and nails. In addition to peripheral joints, inflammation of the spine and sacroiliac joints may occur. Yet, research into this axial phenotype has lagged behind partly because of the challenge in its clinical identification with a lack of specific clinical, molecular or imaging biomarkers. In the absence of a validated definition of what constitutes axial PsA (axPsA), guidelines for the management of axial involvement in PsA in clinical practice are scarce. On the basis of a literature review and their clinical expertise, a group of rheumatology experts provide their opinion to aid the diagnosis and management of axial PsA in clinical practice.