The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection

@article{Rudwaleit2009TheDO,
  title={The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection},
  author={Martin Rudwaleit and D{\'e}sir{\'e}e Mfm van der Heijde and Robert B M Landew{\'e} and Joachim Listing and Nurullah Akkoç and Jan Brandt and Juergen Braun and Chung Tei Chou and Eduardo Collantes-Est{\'e}vez and Maxime Dougados and Feng Huang and J. Gu and M. A. Khan and Yeşim Kirazlı and Walter P. Maksymowych and Herman Mielants and Inge Juul S{\o}rensen and Salih Ozgoçmen and Euthalia Roussou and Rafael Valle-O{\~n}ate and Ulrich Weber and J. C. C. Wei and Joachim Sieper},
  journal={Annals of the Rheumatic Diseases},
  year={2009},
  volume={68},
  pages={777 - 783}
}
Objective: To validate and refine two sets of candidate criteria for the classification/diagnosis of axial spondyloarthritis (SpA). Methods: All Assessment of SpondyloArthritis international Society (ASAS) members were invited to include consecutively new patients with chronic (⩾3 months) back pain of unknown origin that began before 45 years of age. The candidate criteria were first tested in the entire cohort of 649 patients from 25 centres, and then refined in a random selection of 40% of… 
The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part I): classification of paper patients by expert opinion including uncertainty appraisal
TLDR
The ASAS group has developed candidate criteria for the classification of axial SpA that include patients without radiographic sacroiliitis, and the candidate criteria need to be validated in an independent international study.
Performance of the Assessment of Spondyloarthritis International Society criteria for the classification of spondyloarthritis in early spondyloarthritis clinics participating in the ESPERANZA programme.
TLDR
Despite performing better than the Amor or ESSG criteria, the ASAS criteria may be limited to detection of early forms, particularly in populations in which MRI is not extensively available or in populations with a low prevalence of HLA-B27.
Performance of the Assessment in Spondyloarthritis International Society Classification for Axial and Peripheral Spondyloarthritis in an Established Clinical Cohort: Comparison with Criteria Sets of Amor and the European Spondylarthropathy Study Group
TLDR
AS criteria can be used in established disease and was found to be more effective than the Amor and European Spondylarthropathy Study Group criteria in established spondyloarthritis.
The Assessment of SpondyloArthritis international Society classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general
TLDR
The new ASAS classification criteria for peripheral SpA performed well in patients presenting with peripheral arthritis, enthesitis and/or dactylitis, particularly regarding sensitivity.
Percentage of patients with spondyloarthritis in patients referred because of chronic back pain and performance of classification criteria: experience from the Spondyloarthritis Caught Early (SPACE) cohort.
TLDR
The inclusion criteria of the SPACE cohort yield the same high numbers of SpA patients compared with referral strategies like inflammatory back pain, HLA-B27+ or sacroiliitis, yet are easier to apply.
Percentage of patients with spondyloarthritis in patients referred because of chronic back pain and performance of classification criteria: experience from the Spondyloarthritis Caught Early (SPACE) cohort.
TLDR
The inclusion criteria of the SPACE cohort yield the same high numbers of Spondyloarthritis patients compared with referral strategies like inflammatory back pain, HLA-B27+ or sacroiliitis, yet are easier to apply.
Diagnosing axial spondyloarthropathy. The new Assessment in SpondyloArthritis international Society criteria: MRI entering centre stage
TLDR
A new horizon has opened whereby AS sufferers can be identified and treated in the early stages of their disease process before structural damage has occurred, with the emerging data on the efficacy of tumour necrosis factor (TNF)α blocking therapies in early disease.
The ASAS Criteria for Axial Spondyloarthritis: Strengths, Weaknesses, and Proposals for a Way Forward
TLDR
It is suggested that needed improvements of the ASAS criteria for axSpA are suggested, as all criteria sets should be regarded as dynamic concepts open to modifications or updates as the authors' knowledge advances.
Looking Into the New ASAS Classification Criteria for Axial Spondyloarthritis Through the Other Side of the Glass
TLDR
There is a need to improve the validity of the ASAS criteria for axSpA and the clinically well-established entity of AS, as defined by the modified New York (mNY) criteria, should be preserved for the most accurate comparison of the new research studies with those conducted over the last three decades.
A critical overview of the imaging arm of the ASAS criteria for diagnosing axial spondyloarthritis: what the radiologist should know.
TLDR
A number of rules and pitfalls are present in the diagnosis of active sacroiliitis on MRI, and a potential shortcoming of the imaging arm of the ASAS criteria is addressed.
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TLDR
The ASAS group has developed candidate criteria for the classification of axial SpA that include patients without radiographic sacroiliitis, and the candidate criteria need to be validated in an independent international study.
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