{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T15:18:30Z","timestamp":1777389510094,"version":"3.51.4"},"reference-count":20,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2013,10,11]],"date-time":"2013-10-11T00:00:00Z","timestamp":1381449600000},"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":["Am J Sports Med"],"published-print":{"date-parts":[[2014,1]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Posterior acromioclavicular (AC) joint dislocations are frequently misclassified because posterior translation of the clavicle is difficult to evaluate in Zanca radiograph views. A novel radiographic index was used in this study to accurately diagnose posterior dislocations of the AC joint.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Hypothesis:<\/jats:title>\n                    <jats:p>This novel index has a high degree of accuracy for the diagnosis of posterior AC joint dislocations.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study Design:<\/jats:title>\n                    <jats:p>Cohort study (diagnosis); Level of evidence, 2.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>This was an analytic, descriptive study of 150 patients with different grades of AC injuries according to the Rockwood classification (30 patients for each grade of injury: I, II, III, IV, and V). The diagnosis of an AC injury was made both clinically and radiographically by using comparative Zanca and axillary views. Two measurements were performed in Zanca views: the coracoclavicular distance and the AC width distance. A width index was calculated for each patient. The Student t test, Bonferroni test, logistic regression, linear regression, and receiver operating characteristic (ROC) curves were used for statistical analysis. Forty cases were impartially selected to obtain a \u03ba concordance value.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>The average value of the AC width index per group (according to the Rockwood classification) was as follows: type I, 2.1% (range, \u201312% to 25%); type II, 4.2% (range, \u201319% to 29%); type III, 19.1% (range, \u201359% to 91%); type IV, 110.3% (range, 47% to 181%); and type V, \u20133.8% (range, \u201371% to 62%). There was a significant difference between the average width index in the patients with type IV injuries and those in the remaining groups ( P &lt; .05). The ROC curve showed that a width index of 60% has a sensitivity of 95.7% and specificity of 97.5%, with a positive predictive value of 96.7% and negative predictive value of 95.6% to predict a type IV injury. Intraobserver reliability was rated as substantial agreement for each of 3 observers; the interobserver reliability of the 3 independent raters was almost perfect.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>An AC width index of \u226560% is highly accurate for the diagnosis of a posterior AC joint dislocation, with high intraobserver and interobserver concordance.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/0363546513506849","type":"journal-article","created":{"date-parts":[[2013,10,12]],"date-time":"2013-10-12T00:18:32Z","timestamp":1381537112000},"page":"112-116","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":14,"title":["A Novel Radiographic Index for the Diagnosis of Posterior Acromioclavicular Joint Dislocations"],"prefix":"10.1177","volume":"42","author":[{"given":"Alex","family":"Vaisman","sequence":"first","affiliation":[{"name":"Orthopaedic Surgery Department, Cl\u00ednica Alemana de Santiago de Chile, Santiago, Chile"},{"name":"Orthopaedic Surgery, Faculty of Medicine, Cl\u00ednica Alemana Universidad del Desarrollo, Santiago, Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ignacio Eduardo","family":"Villal\u00f3n Montenegro","sequence":"additional","affiliation":[{"name":"Orthopaedic Surgery Department, Cl\u00ednica Alemana de Santiago de Chile, Santiago, Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mar\u00eda Jes\u00fas","family":"Tuca De Diego","sequence":"additional","affiliation":[{"name":"Orthopaedic Surgery Department, Cl\u00ednica Alemana de Santiago de Chile, Santiago, Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juanjose","family":"Valderrama Ronco","sequence":"additional","affiliation":[{"name":"Orthopaedic Surgery Department, Cl\u00ednica Alemana de Santiago de Chile, Santiago, Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2013,10,11]]},"reference":[{"issue":"179","key":"bibr1-0363546513506849","first-page":"260","volume":"15","author":"Alexander 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