About the Axial Spondyloarthritis Working Group

Axial SpA is a form of inflammatory arthritis that most commonly affects the joints of the spine and pelvis. Common features of spondyloarthritis include inflammatory back pain, as well as pain and inflammation in the peripheral joints, the digestive tract or eyes.
Nowadays, patients with axSpA are usually classified in two groups:
i) Patients with radiographic axSpA also known as ankylosing spondylitis (AS), who have developed substantial damage of the pelvis visible on radiographs, and
ii) Patients with non-radiographic axSpA, who do not have damage visible on radiographs but do have other symptoms specific for axSpA.

Désirée van der Heijde

Désirée van der Heijde



Victoria Navarro-Compán



Annelies Boonen



Philip Mease


anne boel

Anne Boel


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Uta Kiltz

Patient Research Partner

marco garrido

Marco Garrido Cumbrera

Patient Research Partner

Introduction to Axial Spondyloarthritis

OMERACT Endorsed Core Domain Set for Axial Spondylarthritis

AxSpA Core Set

Working Group Publications

The ASAS-OMERACT core domain set for axial spondyloarthritis

Endorsement of Definitions of Disease Activity States and Improvement Scores for the Ankylosing Spondylitis Disease Activity Score: Results from OMERACT 10

Selection of a Method for Scoring Radiographs for AS Clinical Trials, by the Assessment in AS Working Group and OMERACT 

AS: Plenary Discussion and Results of Voting on Selection of Domains and Some Specific Instruments

Radiological Scoring Methods in AS Reliability and Sensitivity to Change Over One Year

Stoke Ankylosing Spondylitis Spine Score

A New Dimension to Outcome Application of The Bath Ankylosing Spondylitis Radiology Index

Plain Radiographs as an Outcome Measure in Ankylosing Spondylitis

Relative Value of Erythrocyte Sedimentation Rate and C-Reactive Protein in Assessment of Disease Activity in AS

Outcome Variables in AS: Evaluation of Their Relevance and Discriminant Capacity

Clinical Relevance of C-Reactive Protien in Axial Involvment of AS

Validity Aspects of Erythrocyte Sedimentation Rate and C-Reactive Protein in AS: A Literature Review

A Comparative Study of the Usefulness of the BASFI and the Dougados Functional Index in the Assessment of AS

Comparison of the Dougados Functional Index and the Bath AS Functional Index. A Literature Review

Selection of Instruments in the Core Set for DC-ART, SMARD, Physical Therapy, and Clinical Record Keeping in AS. Progress Report of the ASAS Working Group

Which Domains Should Be lncluded in a Core Set for Endpoints in AS? Introduction to the AS Module of OMERACT IV

Interested in joining the working group as a member?

We are excited to invite you to join the OMERACT mailing list! This will ensure you stay updated on our latest news and activities.
In addition to joining our mailing list, we also encourage you to become part of our active Working Groups. Being part of these groups is an opportunity to collaborate with experts in the field, contribute to important discussions, and influence the future direction of rheumatology outcomes research.
We look forward to your valuable contributions and active participation in our community.


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