Abstract:
                                      Objective To evaluate the clinical efficacy of individual 3D printing plate auxiliary Tight Rope system combined with shoulder arthroscopy in the treatment of acromioclavicular joint dislocation. 
Methods Forty-six patients with acromioclavicular joint dislocation were selected, 23 cases were treated with Tight Rope system combined with shoulder arthroscopic internal fixation (3D group), and 23 cases were treated with conventional Tight Rope system combined with shoulder arthroscopic internal fixation (control group). The operation-related indicators, complications, shoulder function Constant-Murley score (CMS), American Association of shoulder and Elbow surgery score (ASES), pain visual simulation score (VAS), acromioclavicular space distance (ACD), coracoclavicular space distance (CCD) and target area accuracy of coracoid process tunnel were compared between two groups. 
Results All patients were followed up for 12–16 months. The intraoperative blood loss and operation time in the 3D group were significantly better than those in control group (P < 0.01), but there was no statistical significance in the time of hospitalization between two groups (P > 0.05). There was no statistical significance in the VAS score before operation and after 3, 6 and 12 months of operation between two groups (P > 0.05). There were statistically significant in the CMS score, ASES score, ACD index and CCD index after 3, 6 and 12 months of operation between two groups (P < 0.05), but there was no statistical significance in the CMS score, ASES score, ACD index and CCD index before operation between two groups (P > 0.05). The precision rate of coracoid tunnel target area in the 3D group was significantly higher than that in control group (P < 0.05). All the patients had no serious complications such as infection, re-dislocation, secondary fracture and so on. 
Conclusions The individual 3D printing plate auxiliary Tight Rope system combined with arthroscopic internal fixation of the shoulder in the treatment of acromioclavicular joint dislocation has a high positioning accuracy rate, which is helpful to reduce intraoperative blood loss and operation time, and recover shoulder joint function more quickly.