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Two independent reviewers selected studies that complied with the following inclusion criteria: (1) the study included data on surgically treated ACJ dislocation grade III\u2013V in the Rockwood classification, (2) the ACJ injuries were acute (the surgery was performed less than 6 weeks after injury), (3) an arthroscopic evaluation of the glenohumeral joint was performed during surgery. The quality of the studies included was assessed using the tool of the Joanna Briggs Institute.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 47 studies with acute ACJ injuries met the initial inclusion criteria. Of these, 21 studies (9 retrospective case series, 9 prospective case series and 3 retrospective cohort studies) presented data on associated intraarticular lesions amenable for use in the meta\u2010analysis. The meta\u2010analysed studies included a total of 860 subjects with acute ACJ dislocations with a male\/female ratio of 6.5 and a mean age of 32 years. The meta\u2010analysis showed a prevalence of associated intraarticular lesions in subjects with acute ACJ of 19.9% (95% confidence interval [CI] 14.0\u201326.4%; 21 studies, 860 analysed participants; <jats:italic>P<\/jats:italic>\u2009=\u20090.000; <jats:italic>I<\/jats:italic><jats:sup>2<\/jats:sup>: 74.5% random\u2010effects model; low risk of bias).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>One in five subjects with surgically treated acute ACJ dislocations will have an associated intraarticular lesion that requires further intervention. The case for a customary arthroscopic evaluation of the joint, even when an open procedure is performed to deal with the ACJ dislocation, is strong.<\/jats:p><jats:p><jats:bold>Level of evidence<\/jats:bold> IV<\/jats:p><jats:p><jats:bold>Trial registry<\/jats:bold> Systematic review registration number: PROSPERO CRD42018090609.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-020-05917-6","type":"journal-article","created":{"date-parts":[[2020,3,16]],"date-time":"2020-03-16T08:04:59Z","timestamp":1584345899000},"page":"2024-2038","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["The prevalence of intraarticular associated lesions after acute acromioclavicular joint injuries is 20%. 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