Objective To study the effects of double titanium plate with loop(Tight Rope) fixation under endoscopy in the treatment of acromioclavicular joint dislocation.

Methods Forty acromioclavicular joint dislocation patients included 27 cases of Rockwood type Ⅲ and 13 cases of type Ⅳ. Twenty cases treated with Tight Rope internal fixation under arthroscopy and 20 cases treated with open reduction and clavicular hook plate internal fixation were divided into the observation group and control group, respectively. Two groups were followed up for more than 24 months. The surgical indicators and complications in two groups were recorded. The comprehensive efficacy in two groups before operation, after 1 and 24 months of operation were evaluated using the shoulder joint system(UCLA), pain visual analogue(VAS) score and Constant-Murley shoulder score.

Results The average blood loss and hospital stay in observation group were significantly lower than that in control group(P < 0.01), and the difference of the operation time between two groups was not statistically significant(P>0.05). The pain VAS scores in two groups after 1 and 24 months of surgery were lower than that before surgery, and the UCLA and Constant-Murley scores were higher than those before surgery(P < 0.05 to P < 0.01). The differences of the UCLA and Constant-Murley scores between two groups before operation were not statistically significant(P>0.05). The UCLA score and Constant-Murley score after 1 month of operation, and UCLA score after 24 months of operation in observation group were higher than those in control group(P < 0.01). The differences of the excellent and good rate of operation and in cidence rate of complications between two groups after 24 months of operation were not statistically significant(P>0.05).

Conclusions The double titanium plate with loop fixation under endoscopy in the treatment of acromioclavicular joint dislocation can firmly fix the dislocated acromioclavicular joint, reduce pain symptoms and improve joint function, and also has the advantages of small trauma and low complication rate.