Materials and Methods: In this retrospective cohort study, 68 patients were enrolled after referring to the Shohada Medical Education Center of Tabriz during 2014-2017 with the dislocation of the 4th, 5th, and 6th grade ACJ dislocation. In this study, 44 and 24 patients underwent open reduction and internal fixation with a screw and a hook plate, respectively. The retest workers, and the shoulder range of motion (ROM), as well as pain and device failure were compared between the 2 groups.

Results: According to the results, there were no significant differences between 68 patients with acute dislocation of ACJ type 4, 5, and 6 in terms of work time and pain intensity in the 2 groups (P = 0.78 and P = 0.29), but in the examination of ROM, abduction, forward flexion, and external rotation had significantly higher limitations in hook plate compared to the screw (P = 0.03, P = 0.001, and P = 0.02). The maximum motion limitation was observed in shoulder abduction, but the internal rotation between the 2 groups was not significantly different. Eventually, the device failure rate for the screw was significantly higher and approximately 18.4% whereas there was no device failure in hook plate fixation.

Conclusions: Based on the present results regarding acromioclavicular dislocation, surgical treatment using a screw showed better functional improvement in comparison to the hook plate although the probability of devise failure was higher.