Improved identification of unstable acromioclavicular joint injuries in a clinical population using the acromial center line to dorsal clavicle radiographic measurement.

Karargyris, Orestis; Murphy, Richard J; Arenas, Antonio; Bolliger, Lilianna; Zumstein, Matthias (2020). Improved identification of unstable acromioclavicular joint injuries in a clinical population using the acromial center line to dorsal clavicle radiographic measurement. Journal of shoulder and elbow surgery, 29(8), pp. 1599-1605. Elsevier 10.1016/j.jse.2019.12.014

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BACKGROUND

Accurate classification and subsequent management of acromioclavicular (AC) joint injuries remains a contentious topic. The updated Rockwood classification acknowledges "stable IIIA" and "unstable IIIB" injuries, a watershed accepted by ISAKOS and important in guiding clinical management. Traditionally, the coracoclavicular distance is used to classify these injuries, despite well-documented limitations. This study aimed to evaluate displacement in AC joint injuries by measuring both coracoclavicular (CC) distance and the newly proposed acromial center line to dorsal clavicle (AC-DC) distance, in a cohort of patients, and correlate the results between the 2 measurements and relationship to Rockwood grade.

MATERIALS AND METHODS

Ninety consecutive cases of AC joint injury were evaluated radiographically for Rockwood classification, CC distance on anteroposterior radiographs, and AC-DC distance on Alexander view radiographs. Inter- and intraobserver reliability for each measurement was calculated as well as correlation between the 2 measurement types and the degree to which each measurement accurately represented the Rockwood classification.

RESULTS

Although both CC and AC-DC measurements showed very high inter- and intraobserver reliability, the CC distance systematically underestimated the degree of AC joint displacement when compared with the AC-DC measurement as the severity of injury increased, particularly in the presence of posterior horizontal displacement such as that seen in Rockwood IV injuries.

CONCLUSION

The AC-DC measurement and use of the Alexander view provides the clinician with a more realistic appreciation of true AC joint displacement, especially in defining watershed cases (ie, IIIA/IIB/IV) and may better inform the decision-making process regarding management options and recommendations.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Bolliger-Kägi, Lilianna and Zumstein, Matthias

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1058-2746

Publisher:

Elsevier

Language:

English

Submitter:

Kathrin Aeschlimann

Date Deposited:

30 Dec 2020 11:22

Last Modified:

01 Jan 2021 06:38

Publisher DOI:

10.1016/j.jse.2019.12.014

PubMed ID:

32147334

Uncontrolled Keywords:

AC joint Acromioclavicular joint CC distance Rockwood injury radiographic measurement shoulder

BORIS DOI:

10.48350/149022

URI:

https://boris.unibe.ch/id/eprint/149022

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