{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T23:46:57Z","timestamp":1777506417686,"version":"3.51.4"},"reference-count":25,"publisher":"SAGE Publications","issue":"12","license":[{"start":{"date-parts":[[2020,3,22]],"date-time":"2020-03-22T00:00:00Z","timestamp":1584835200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Acta Radiol"],"published-print":{"date-parts":[[2020,12]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>The acromion index (AI) is the acromial lateral extension above the head of the humerus. Some researchers have advocated that the AI indicates the severity of the tear size of the full-thickness supraspinatus tendon.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To validate the reproducibility of the AI between shoulder magnetic resonance imaging (MRI) and standard X-ray and to verify whether the AI is a useful index for stratifying the severity of supraspinatus tendon injuries, as well as full-thickness tears.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Material and Methods<\/jats:title>\n                    <jats:p>We enrolled 200 patients with impingement syndrome who were subsequently evaluated with standard X-ray of the shoulder in the anteroposterior view, as well as an MRI. We performed a pilot study to validate the reproducibility of the AI using standard X-ray and MRI, and to compare the AI between these imaging modalities. The severity of supraspinatus tendon injury was classified into four groups (0\u2009=\u2009no evidence of injury, 1\u2009=\u2009partial tear, 2\u2009=\u2009full-thickness tear, and 3\u2009=\u2009complete rupture) based on an official reading of the shoulder MRI. We compared the AIs of both modalities between the groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Intraclass correlation coefficients of the AIs between the two examiners were 0.819 for MRI and 0.808 for plain X-ray. The mean AI from standard X-ray was greater than that from MRI ( P&lt;0.0001). There was no statistical correlation between the AI and the severity of supraspinatus tendon injury.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Our findings indicate that the AI cannot be generally used as a predictive reference for the stratified severities of supraspinatus tendon injury.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/0284185120911188","type":"journal-article","created":{"date-parts":[[2020,3,22]],"date-time":"2020-03-22T10:18:25Z","timestamp":1584872305000},"page":"1661-1667","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Feasibility of the acromion index as a reference of severity of stratified supraspinatus tendon injury: a secondary analysis"],"prefix":"10.1177","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5310-4802","authenticated-orcid":false,"given":"Hyoung Seop","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation, National Health Insurance Service Ilsan Hospital, Ilsan, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung Ho","family":"Joo","sequence":"additional","affiliation":[{"name":"Department of Radiology, National Health Insurance Service Ilsan Hospital, Ilsan, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyun Sun","family":"Lim","sequence":"additional","affiliation":[{"name":"Research and Analysis Team, National Health Insurance Service Ilsan Hospital, Ilsan, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hye Won","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Medicine, Bucheon St. Mary\u2019s Hospital, Catholic University of Korea, Bucheon, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,3,22]]},"reference":[{"key":"bibr1-0284185120911188","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-197254010-00003"},{"key":"bibr2-0284185120911188","doi-asserted-by":"publisher","DOI":"10.1097\/00003086-198303000-00010"},{"key":"bibr3-0284185120911188","first-page":"228","volume":"10","author":"Bigliani LU.","year":"1986","journal-title":"Orthop 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