{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T18:51:34Z","timestamp":1792522294654,"version":"4.5.0"},"reference-count":34,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2018,3,23]],"date-time":"2018-03-23T00:00:00Z","timestamp":1521763200000},"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 &amp; Rheumatology"],"published-print":{"date-parts":[[2018,5]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>Low\u2010grade bone marrow edema (<jats:styled-content style=\"fixed-case\">BME<\/jats:styled-content>) has been reported in the sacroiliac (<jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content>) joints of 25% of healthy individuals and patients with nonspecific mechanical back pain, thus challenging the specificity and predictive value of magnetic resonance imaging (<jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content>) for the discrimination of early spondyloarthritis (SpA). It is unknown whether stress injury in competition sports may trigger <jats:styled-content style=\"fixed-case\">BME<\/jats:styled-content>. This study sought to explore the frequency and anatomic distribution of <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> lesions in recreational and elite athletes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>After pretest calibration, semicoronal <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> scans of the <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joints of 20 recreational runners before and after running and 22 elite ice hockey players were assessed for <jats:styled-content style=\"fixed-case\">BME<\/jats:styled-content> and structural lesions. Three readers assessed the <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> scans in a blinded manner, using an <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint quadrant\u2013based module; scans from tumor necrosis factor inhibitor\u2013treated patients with SpA served for masking. The readers recorded subjects who met the Assessment of SpondyloArthritis international Society (<jats:styled-content style=\"fixed-case\">ASAS<\/jats:styled-content>) definition of active sacroiliitis. For descriptive analysis, the frequency of <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint quadrants exhibiting BME and structural lesions, as concordantly recorded by \u22652 of 3 readers, and their distribution in 8 anatomic <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint regions (the upper and lower ilium and sacrum, subdivided in anterior and posterior slices) were determined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The proportions of recreational runners and elite ice hockey players fulfilling the <jats:styled-content style=\"fixed-case\">ASAS<\/jats:styled-content> definition of active sacroiliitis, as recorded concordantly by \u22652 of 3 readers, were 30\u201335% and 41%, respectively. In recreational runners before and after running, the mean \u00b1 <jats:styled-content style=\"fixed-case\">SD<\/jats:styled-content> number of <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint quadrants showing <jats:styled-content style=\"fixed-case\">BME<\/jats:styled-content> was 3.1 \u00b1 4.2 and 3.1 \u00b1 4.5, respectively, while in elite ice hockey players, it was 3.6 \u00b1 3.0. The posterior lower ilium was the single most affected <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint region, followed by the anterior upper sacrum. Erosion was virtually absent.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In recreational and elite athletes, <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> revealed <jats:styled-content style=\"fixed-case\">BME<\/jats:styled-content> in an average of 3\u20134 <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint quadrants, meeting the <jats:styled-content style=\"fixed-case\">ASAS<\/jats:styled-content> definition of active sacroiliitis in 30\u201341% of subjects. The posterior lower ilium was the single most affected <jats:styled-content style=\"fixed-case\">SI<\/jats:styled-content> joint region. These findings in athletes could help refine data\u2010driven thresholds for defining sacroiliitis in early SpA.<\/jats:p><\/jats:sec>","DOI":"10.1002\/art.40429","type":"journal-article","created":{"date-parts":[[2018,2,12]],"date-time":"2018-02-12T00:02:45Z","timestamp":1518393765000},"page":"736-745","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":188,"title":["Frequency and Anatomic Distribution of Magnetic Resonance Imaging Features in the Sacroiliac Joints of Young Athletes"],"prefix":"10.1002","volume":"70","author":[{"given":"Ulrich","family":"Weber","sequence":"first","affiliation":[{"name":"King Christian 10th Hospital for Rheumatic Diseases, Gr\u00e5sten, Denmark and University of Southern Denmark Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne Grethe","family":"Jurik","sequence":"additional","affiliation":[{"name":"Aarhus University Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Zejden","sequence":"additional","affiliation":[{"name":"Aarhus University Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ejnar","family":"Larsen","sequence":"additional","affiliation":[{"name":"North Denmark Regional Hospital Hj\u00f8rring Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steen Hylgaard","family":"J\u00f8rgensen","sequence":"additional","affiliation":[{"name":"North Denmark Regional Hospital Hj\u00f8rring Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaspar","family":"Rufibach","sequence":"additional","affiliation":[{"name":"Rufibach rePROstat, Bern, Switzerland and F. 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