Table 1.

Abbreviated summary of diagnostic criteria for various rheumatic diseases affecting the TMJ. Criteria provided have been commonly used for clinical and/or research purposes. Abbreviations: ACR—American College of Rheumatology; ANA—anti-nuclear antibodies; ARA—American Rheumatism Association (predecessor of the ACR); ASAS—Assessment of Spondyloarthritis International Society; axSpA—axial spondyloarthritis; CASPAR—Classification of Psoriatic Arthritis Study; CCP—cyclic citrullinated peptide; CRP—C-reactive protein; ESR—erythrocyte sedimentation rate; EULAR—European League Against Rheumatism; FM—fibromyalgia; ILAR—International League of Associations for Rheumatology; JIA—juvenile idiopathic arthritis; PsA—psoriatic arthritis; RA—rheumatoid arthritis; RF—rheumatoid factors; SLE—systemic lupus erythematosus; SSc—systemic sclerosis; SSS—symptom severity scale; WPI—widespread pain index.

Condition	Abbreviated Diagnostic Criteria
JIA	ILAR/EULAR (2001) Arthritis 6+ weeks Age < 16 years at diagnosis No other identifiable cause
SSc	ACR/EULAR (2013) Each item is weighted with total score ≥ 9 indicative of definite SSc Skin thickening of fingers Fingertip lesions Telangiectasias Abnormal nailfold capillaries Pulmonary arterial hypertension and/or interstitial lung disease Raynaud phenomenon Anti-centromere, -topoisomerase I, or -RNA polymerase III antibodies
RA	ARA (1987) 4+ of the following Morning stiffness for 6+ weeks Arthritis, 3+ joints, for 6+ weeks Arthritis, hands, for 6+ weeks Symmetric arthritis for 6+ weeks Rheumatoid nodules RF+ Radiographic change	ACR/EULAR (2010) Synovitis, 1+ joint Absence of alternative diagnosis AND Score of 6+ out of the following, which are weighted: Number of involved joints RF+ or anti-CCP+ Elevated ESR or CRP Symptoms 6+ weeks
SLE	ACR (1997) 4+ of 11 criteria including mucocutaneous and major organ clinical criteria and immunologic laboratory criteria	ACR/EULAR (2019) ANA+ or equivalent At least one clinical criterion Additional clinical or immunologic criteria are weighted and are additive towards a final score (≥10 = SLE)
axSpA	ASAS (2009) 3+ months of back pain with onset prior to 45 years of age IF sacroiliitis on imaging, 1+ SpA feature is required IF no sacroiliitis on imaging, HLA-B27+ and 2+ SpA features are required
PsA	CASPAR (2006) 3+ points from weighted items of the following Skin psoriasis Nail lesions Dactylitis Negative RF Juxta-articular bone formation
FM	ACR (1990) Widespread, chronic pain 11+ of 18 tender points No other identifiable cause	ACR (2010) WPI ≥ 7 + SSS ≥ 5 OR WPI ≥ 3 + SSS ≥ 9 Symptoms 3+ months No other identifiable cause