Abstract:Abstract: Objective?To analyze the clinical effect of arthroscopically assisted double button plate reconstruction of coracoclavicular ligament in treatment of Rockwood Ⅲ, Ⅳ, Ⅴ and Ⅵ acute acromioclavicular joint dislocation.?Methods?From March 2016 to March 2017, 12 patients with Rockwood type Ⅲ, Ⅳ, Ⅴ, VI, shoulder joint dislocation were included, all these cases were treated by arthroscopic double Endobutton fixation technique. Patients were followed up for 3 to 18 months. The changes of VAS score, and Constant score of acromioclavicular joint in both perioperative and postoperative were recorded.?Results?The mean follow-up time was 5 months (range from 3 to 18 months), and mean time from injury to surgery was 3.70 days (2 ~ 6 days). The therapeutic effects were achieved in all patients after the arthroscopically assisted double button plate reconstruction. All the measurements, including the mean forward elevation VAS scores before 5.62 (range, 4 ~ 6) and after fixation 1.20 (range, 0 ~ 2), and mean Constant scores before 29.14 (range, 13 ~ 40) and after fixation 91.24 (range, 72 ~ 100), improved significantly (P < 0.01) after the treatment.?Conclusion?Arthroscopic double button fixation technique is a minimally invasive way to deal with the associate injuries of the shoulder, and achieve an excellent effect in the treatment of acute acromioclavicular joint dislocation.