Identification of unstable AC joint injuries in a clinical population using the ACDC measurement

What is it about?

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 ISA- KOS 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 coracoclavic- ular (CC) distance and the newly proposed acromial center line to dorsal clavicle (AC-DC) distance, in a cohort of patients, and corre- late the results between the 2 measurements and relationship to Rockwood grade.

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Why is it important?

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.

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