RT Journal Article SR Electronic T1 Longitudinal Reliability of the OMERACT Thumb Base Osteoarthritis Magnetic Resonance Imaging Scoring System (TOMS) JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP jrheum.180949 DO 10.3899/jrheum.180949 A1 Féline P.B. Kroon A1 Sjoerd van Beest A1 Frédérique Gandjbakhch A1 Charles G. Peterfy A1 Su Chen A1 Philip G. Conaghan A1 Iris Eshed A1 Violaine Foltz A1 Harry K. Genant A1 Ida K. Haugen A1 Jeroen K. Medema A1 Mikkel Østergaard A1 Lanju Zhang A1 Marc C. Levesque A1 Margreet Kloppenburg YR 2018 UL http://www.jrheum.org/content/early/2018/12/10/jrheum.180949.abstract AB Objective To assess the longitudinal reliability of the Outcome Measures in Rheumatology (OMERACT) Thumb base Osteoarthritis Magnetic resonance imaging (MRI) Scoring system (TOMS). Methods Paired MRI of patients with hand osteoarthritis were scored in 2 exercises (6-mo and 2-yr followup) for synovitis, subchondral bone defects (SBD), osteophytes, cartilage assessment, bone marrow lesions (BML), and subluxation. Interreader reliability of delta scores was assessed. Results Little change occurred. Average-measure intraclass correlation coefficients were good-excellent (≥ 0.71), except synovitis (0.55–0.83) and carpometacarpal-1 osteophytes/cartilage assessment (0.47/0.39). Percentage exact/close agreement was 52–92%/68–100%, except BML in 2 years (28%/64–76%). Smallest detectable change was below the scoring increment, except in SBD and BML. Conclusion TOMS longitudinal reliability was moderate-good. Limited change hampered assessment.