Abstract:[Objective] To compare the clinical outcomes of coracoclavicular ligament reconstruction with modified Y-shaped Tight- Rope system (TR) versus internal fixation with hook plate for acromioclavicular dislocation. [Methods] A retrospective study was conducted on 30 patients who received surgical treatment for acromioclavicular dislocation in our hospital from January 2017 to November 2020. Ac- cording to the preoperative doctor-patient communication results, 9 patients underwent coracoclavicular ligament reconstruction with modi- fied TR (TR group) , while the other 21 patients had fixation with hook plate (hook plate group). The perioperative, follow-up and imaging results of the two groups were compared. [Results] Both groups of patients successfully completed the operation, and there were no compli- cations such as vascular and nerve injury and fracture. There was no significant difference in operation time, incision length, intraoperative bleeding, fluoroscopy times, incision healing and hospital stay between the two groups (P>0.05) . All patients were followed up for an aver- age of (15.34±3.26) months. There was no significant difference in the recovery time of complete weight-bearing activities between the two groups (P>0.05) . The VAS scores decreased significantly (P<0.05) , while Constant-Murley score and ROM of shoulder lift were signifi- cantly increased over time in both groups (P<0.05) . At 3 months and the latest follow-up, the TR group proved significantly superior to the hook plate group in terms of VAS score, Constant-Murley score and ROM (P<0.05) . Radiographically, the coracoclavicular distance (CCD) and acromioclavicular distance (ACD) significantly reduced in both groups at the latest follow-up compared with those preoperatively (P< 0.05) , whereas there was no significant difference in CCD and ACD between the two groups at any corresponding time points (P>0.05) . [Conclusion] The coracoclavicular ligament reconstruction with modified Y-shaped TightRope is superior to the internal fixation with hook plate for Rockwood type III~V acromioclavicular dislocation in term of clinical outcomes.