{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T04:01:10Z","timestamp":1781841670672,"version":"3.54.5"},"reference-count":33,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2020,8,31]],"date-time":"2020-08-31T00:00:00Z","timestamp":1598832000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["acrjournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Arthritis Care & Research"],"published-print":{"date-parts":[[2020,9]]},"abstract":"Objective<\/jats:title>To develop a magnetic resonance imaging (MRI<\/jats:styled-content>) atlas for the assessment of osteoarthritis (OA<\/jats:styled-content>) of the first metatarsophalangeal (MTP<\/jats:styled-content>) joint, and to assess its intra\u2010 and interexaminer reproducibility.<\/jats:p><\/jats:sec>Methods<\/jats:title>MRI<\/jats:styled-content> (proton density with and without fat suppression) was performed on the first MTP<\/jats:styled-content> joint of 60 participants (30 participants with first MTP<\/jats:styled-content> joint OA<\/jats:styled-content> and 30 participants without first MTP<\/jats:styled-content> joint OA<\/jats:styled-content>). Characteristic MRI<\/jats:styled-content> features of OA<\/jats:styled-content> were then used to develop an MRI<\/jats:styled-content> atlas of first MTP<\/jats:styled-content> joint OA<\/jats:styled-content>. The atlas assessed osteophytes (dorsal metatarsal head, plantar metatarsal head, dorsal proximal phalanx), bone marrow lesions (metatarsal head, proximal phalanx, sesamoids), cysts (metatarsal head, proximal phalanx), effusion\u2010synovitis (dorsal, plantar), joint space narrowing (metatarsal\u2010proximal phalanx, metatarsal sesamoids), and cartilage loss. To assess the reproducibility of the atlas, 2 examiners independently rated the MRI<\/jats:styled-content>s of 30 participants on 2 occasions. Intra\u2010 and interexaminer reproducibility were determined using percentage agreement and Gwet's AC<\/jats:styled-content>1.<\/jats:p><\/jats:sec>Results<\/jats:title>Observations using the atlas demonstrated fair\u2010to\u2010perfect intraexaminer reproducibility (percentage agreement from 67% to 100%, and Gwet's AC<\/jats:styled-content>1 from 0.38 to 1.00) and fair\u2010to\u2010almost\u2010perfect interexaminer reproducibility (percentage agreement from 67% to 98%, and Gwet's AC<\/jats:styled-content>1 from 0.40 to 0.96).<\/jats:p><\/jats:sec>Conclusion<\/jats:title>An MRI<\/jats:styled-content> scoring system for the assessment of OA<\/jats:styled-content> of the first MTP<\/jats:styled-content> joint has been developed. The atlas demonstrates excellent intra\u2010 and interexaminer reproducibility. 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