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This study aimed to investigate the effect of rotator cuff tears on in vivo shoulder kinematics during a 30\u00b0 loaded abduction test using single-plane fluoroscopy.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Materials and methods<\/jats:title>\n                <jats:p>In total, 25 younger controls, 25 older controls and 25 patients with unilateral symptomatic rotator cuff tears participated in this study. Both shoulders of each participant were analysed and grouped on the basis of magnetic resonance imaging into healthy, rotator cuff tendinopathy, asymptomatic and symptomatic rotator cuff tears. All participants performed a bilateral 30\u00b0 arm abduction and adduction movement in the scapular plane with handheld weights (0, 2 and 4\u00a0kg) during fluoroscopy acquisition. The range of upward\u2013downward scapular rotation and superior\u2013inferior glenohumeral translation were measured and analysed during abduction and adduction using a linear mixed model (loads, shoulder types) with random effects (shoulder ID).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Scapular rotation was greater in shoulders with rotator cuff tendinopathy and asymptomatic rotator cuff tears than in healthy shoulders. Additional load increased upward during abduction and downward during adduction scapular rotation (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001 in all groups but rotator cuff tendinopathy). In healthy shoulders, upward scapular rotation during 30\u00b0 abduction increased from 2.3\u00b0 with 0-kg load to 4.1\u00b0 with 4-kg load and on shoulders with symptomatic rotator cuff tears from 3.6\u00b0 with 0-kg load to 6.5\u00b0 with 4-kg load. Glenohumeral translation was influenced by the handheld weights only in shoulders with rotator cuff tendinopathy (<jats:italic>P<\/jats:italic>\u2009\u2264\u20090.020). Overall, superior glenohumeral translation during 30\u00b0 abduction was approximately 1.0\u00a0mm with all loads.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>The results of glenohumeral translation comparable to control but greater scapular rotations during 30\u00b0 abduction in the scapular plane in rotator cuff tears indicate that the scapula compensates for rotator cuff deficiency by rotating. Further analysis of load-dependent joint stability is needed to better understand glenohumeral and scapula motion.<\/jats:p>\n                <jats:p><jats:italic>Level of evidence<\/jats:italic>: Level 2.<\/jats:p>\n                <jats:p><jats:italic>Trial registration<\/jats:italic>: Ethical approval was obtained from the regional ethics committee (Ethics Committee Northwest Switzerland EKNZ 2021-00182), and the study was registered at clinicaltrials.gov on 29 March 2021 (trial registration number NCT04819724, <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/clinicaltrials.gov\/ct2\/show\/NCT04819724\">https:\/\/clinicaltrials.gov\/ct2\/show\/NCT04819724<\/jats:ext-link>).<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s10195-024-00774-2","type":"journal-article","created":{"date-parts":[[2024,6,8]],"date-time":"2024-06-08T11:01:48Z","timestamp":1717844508000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Severity of rotator cuff disorders and additional load affect fluoroscopy-based shoulder kinematics during arm abduction"],"prefix":"10.1186","volume":"25","clinical-trial-number":[{"clinical-trial-number":"nct04819724","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9357-3681","authenticated-orcid":false,"given":"Eleonora","family":"Croci","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0072-3447","authenticated-orcid":false,"given":"Hanspeter","family":"Hess","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6779-7988","authenticated-orcid":false,"given":"Jeremy","family":"Genter","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3813-6742","authenticated-orcid":false,"given":"Cornelia","family":"Baum","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1515-0928","authenticated-orcid":false,"given":"Balazs Krisztian","family":"Kovacs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7526-9536","authenticated-orcid":false,"given":"Corina","family":"N\u00fcesch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6077-2905","authenticated-orcid":false,"given":"Daniel","family":"Baumgartner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4086-4973","authenticated-orcid":false,"given":"Kate","family":"Gerber","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2726-3428","authenticated-orcid":false,"given":"Andreas Marc","family":"M\u00fcller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6472-1689","authenticated-orcid":false,"given":"Annegret","family":"M\u00fcndermann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,6,8]]},"reference":[{"key":"774_CR1","doi-asserted-by":"publisher","first-page":"63","DOI":"10.1054\/math.2000.0241","volume":"5","author":"SA Hess","year":"2000","unstructured":"Hess SA (2000) Functional stability of the glenohumeral joint. 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