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The guidelines and algorithm of the Preferred Reporting Items for Systematic Reviews and Meta\u2010analyses (PRISMA) were used. Included for analysis were articles reporting the accuracy of glenoid bone loss\u2013measuring methods in patients with anterior shoulder instability by comparing an index test and a reference test. Furthermore, articles were included if anterior glenoid bone loss was quantified using a ruler during arthroscopy or by measurements on plain radiograph(s), computed tomography (CT) images, or magnetic resonance images in living humans. The risk of bias was determined using the Quality Assessment of Diagnostic Accuracy Studies (QUADAS\u20102) tool.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Twenty\u2010one studies were included, showing 17 different methods. Three studies reported on the accuracy of methods performed on 3\u2010dimensional CT. Two studies determined the accuracy of glenoid bone loss\u2013measuring methods performed on radiography by comparing them with methods performed on 3\u2010dimensional CT. Six studies determined the accuracy of methods performed using imaging modalities with an arthroscopic method as the reference. Eight studies reported on the influence of the imaging modality on the accuracy of the methods. There was no consensus regarding the gold standard. Because of the heterogeneity of the data, a quantitative analysis was not feasible.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Consensus regarding the gold standard in measuring glenoid bone loss is lacking. The use of heterogeneous data and varying methods contributes to differences in the gold standard, and accuracy therefore cannot be determined.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level IV, systematic review of Level II, III, and IV studies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1016\/j.arthro.2020.04.012","type":"journal-article","created":{"date-parts":[[2020,4,21]],"date-time":"2020-04-21T02:20:15Z","timestamp":1587435615000},"page":"2295","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":40,"title":["Accuracy of Currently Available Methods in Quantifying Anterior Glenoid Bone Loss: Controversy Regarding Gold Standard\u2014A Systematic Review"],"prefix":"10.1002","volume":"36","author":[{"given":"Lukas P.E.","family":"Verweij","sequence":"first","affiliation":[{"name":"Department 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