Karagyris O, Murphy RJ, Arenas A, et al. - In this study, displacement in AC joint injuries was investigated by assessing both coracoclavicular (CC) distance and the newly proposed acromial center line to dorsal clavicle (AC-DC) distance, in a cohort of patients, and compare the outcomes between the two measurements and associations to Rockwood grade. Researchers assessed 90 consecutive cases of AC joint injury radiographically for Rockwood classification, CC distance on anteroposterior radiographs and AC-DC distance on Alexander view radiographs. They further estimated inter- and intra-observer reliability for each measurement as well as correlation between the two measurement types and degree to which each measurement accurately represented the Rockwood classification. It was shown that the AC-DC assessment and use of the Alexander view gives the clinician with a more realistic appreciation of true AC joint displacement, particularly in characterizing watershed cases (i.e. IIIA/IIB/IV) and may better inform the decision-making process regarding management options and recommendations.