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Emergency Medicine International
Volume 2013, Article ID 171609, 5 pages
Research Article

Epidemiology of Isolated Acromioclavicular Joint Dislocation

1Department of Orthopaedics and Traumatology, Istituto Chirurgico Ortopedico Traumatologico (I.C.O.T.), Via Faggiana 1668, 04100 Latina, Italy
2Department of Orthopaedics and Traumatology, Sapienza University of Rome, I.C.O.T., Via Faggiana 1668, 04100 Latina, Italy
3Department of Orthopaedics, Marche Polytechnic University, 60121 Ancona, Italy
4Department of Statistics, Value Lab srl, 00187 Rome, Italy
5Department of Orthopaedics and Traumatology, National Institute of Rehabilitation, 14389, Mexico
6Department of Radiological Sciences, Sapienza University of Rome, ICOT, Via Faggiana 1668, 04100 Latina, Italy

Received 24 September 2012; Revised 29 December 2012; Accepted 30 December 2012

Academic Editor: Wasim S. Khan

Copyright © 2013 Claudio Chillemi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. Acromioclavicular (AC) joint dislocation is a common shoulder problem. However, information about the basic epidemiological features of this condition is scarce. The aim of this study is to analyze the epidemiology of isolated AC dislocation in an urban population. Materials and Methods. A retrospective database search was performed to identify all patients with an AC dislocation over a 5-year period. Gender, age, affected side and traumatic mechanism were taken into account. X-rays were reviewed by two of the authors and dislocations were classified according to the Rockwood’s criteria. Results. A total of 108 patients, with a mean age of 37.5 years were diagnosed with AC dislocation. 105 (97.2%) had an isolated AC dislocation, and 3 (2.8%) were associated with a clavicle fracture. The estimated incidence was 1.8 per 10000 inhabitants per year and the male-female ratio was 8.5 : 1. 50.5% of all dislocations occurred in individuals between the ages of 20 and 39 years. The most common traumatic mechanism was sport injury and the most common type of dislocation was Rockwood type III. Conclusions. Age between 20 and 39 years and male sex represent significant demographic risk factors for AC dislocation.