{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T15:37:42Z","timestamp":1777477062479,"version":"3.51.4"},"reference-count":0,"publisher":"SAGE Publications","issue":"5","license":[{"start":{"date-parts":[[2010,6,1]],"date-time":"2010-06-01T00:00:00Z","timestamp":1275350400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Acta Radiol"],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:p>Background: The iliopsoas compartment can be involved in many different disease processes with a wide variety of symptoms that may simulate avascular necrosis (AVN) of the femoral head. The psoas muscle merges with the iliacus to form a checkmark (\u221a) shape in the coronal MRI plane, with normal muscle intensities, on both sides of the spine.<\/jats:p>\n                  <jats:p>Purpose: To evaluate whether abnormality of this checkmark shape (obliteration or abnormal intensity), the checkmark sign, can be used as a simple indicator of iliopsoas pathologies on MR examinations performed for suspected AVN of the hip.<\/jats:p>\n                  <jats:p>Material and Methods: A total of 75 hip MRI examinations performed during 2007 for suspected AVN (male:female ratio, 44:31; average age, 41 years) were retrospectively assessed. The iliopsoas compartment was assessed on the coronal T1 and T2 fat saturated sequences for the presence of the checkmark sign by a consensus of two readers.<\/jats:p>\n                  <jats:p>Results: Twenty-six patients had signs of AVN and 49 patients had either other hip findings or normal hips. A normal checkmark shape was observed in all but two examinations. Obliteration of the checkmark shape, a positive checkmark sign, in those two was due to psoas compartment pathology (infection and hematoma of the iliopsoas compartment).<\/jats:p>\n                  <jats:p>Conclusion: A positive checkmark sign (abnormal shape or intensity) can serve as a clue for unsuspected iliopsoas pathology when evaluating MRI of the hip in patients with suspected AVN.<\/jats:p>","DOI":"10.3109\/02841851003685658","type":"journal-article","created":{"date-parts":[[2010,5,19]],"date-time":"2010-05-19T04:05:04Z","timestamp":1274241904000},"page":"539-542","source":"Crossref","is-referenced-by-count":2,"title":["Checkmark: A sign for the detection of iliopsoas pathology on MRI of the hip"],"prefix":"10.1177","volume":"51","author":[{"given":"Iris","family":"Eshed","sequence":"first","affiliation":[{"name":"Department of Diagnostic Imaging, Sheba Medical Center, Tel Hashomer, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yael","family":"Inbar","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Imaging, Sheba Medical Center, Tel Hashomer, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marjorie","family":"Hertz","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Imaging, Sheba Medical Center, Tel Hashomer, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sara","family":"Apter","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Imaging, Sheba Medical Center, Tel Hashomer, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2010,6,1]]},"container-title":["Acta Radiologica"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/journals.sagepub.com\/doi\/pdf\/10.3109\/02841851003685658","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/journals.sagepub.com\/doi\/pdf\/10.3109\/02841851003685658","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T13:57:37Z","timestamp":1777384657000},"score":1,"resource":{"primary":{"URL":"http:\/\/journals.sagepub.com\/doi\/10.3109\/02841851003685658"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2010,6]]},"references-count":0,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2010,6]]}},"alternative-id":["10.3109\/02841851003685658"],"URL":"https:\/\/doi.org\/10.3109\/02841851003685658","relation":{},"ISSN":["0284-1851","1600-0455"],"issn-type":[{"value":"0284-1851","type":"print"},{"value":"1600-0455","type":"electronic"}],"subject":[],"published":{"date-parts":[[2010,6]]}}}