Assessment in SpondyloArthritis international Society (ASAS) criteria were validated in an international cohort trial with a sensibility and specificity close to 82.9 and 84.4%, respectively.
ASAS Categorization Criteria for Spondyloarthritis
ASAS Categorization Criteria for spondyloarthritis (SpA) in patients under 45 years old of age with lower back pain of 3 months duration.
- Radiological diagnosis of sacroiliitis + 1 or more features of spondyloarthritis
OR
- HLA B27 + 2 or more features of spondyloarthritis
Features of spondyloarthritis
- Low inflammatory pain
- Arthritis
- Enthesitis
- Uveítis
- Dactilitis
- Psoriasis
- Crohn/colitis
- Good response to NSAIDs
- Family history of spondyloarthropathy
- HLA B27
- High CRP levels
Radiological diagnosis of sacroiliitis
- Active (acute) inflammation in the MRI highly suggestive of sacroiliitis due to SpA
- Radiological sacroiliitis defined according to the New York criteria (grade >2 bilateral or grade 3-4 unilateral)
References:
- Lambert RG, Bakker PA, van der Heijde D, Weber U, Rudwaleit M, Hermann KG, Sieper J, Baraliakos X, Bennett A, Braun J, Burgos-Vargas R, Dougados M, Pedersen SJ, Jurik AG, Maksymowych WP, Marzo-Ortega H, Østergaard M, Poddubnyy D, Reijnierse M, van den Bosch F, van der Horst-Bruinsma I, Landewé R. Defining active sacroiliitis on MRI for classification of axial spondyloarthritis: update by the ASAS MRI working group. Ann Rheum Dis. 2016 Nov;75(11):1958-1963. [Medline]
- Banegas Illescas ME, López Menéndez C, Rozas Rodríguez ML, Fernández Quintero RM. New ASAS criteria for the diagnosis of spondyloarthritis: diagnosing sacroiliitis by magnetic resonance imaging. Radiologia. 2014 Jan-Feb;56(1):7-15. [Medline]
- Sieper J, Rudwaleit M, Baraliakos X, Brandt J, Braun J, Burgos-Vargas R, Dougados M, Hermann KG, Landewé R, Maksymowych W, van der Heijde D. The Assessment of SpondyloArthritis international Society (ASAS) handbook: a guide to assess spondyloarthritis. Ann Rheum Dis. 2009 Jun;68 Suppl 2:ii1-44. [Medline]
Created: Aug 16, 2019.
