Acromioclavicular dislocation is one of the common dislocations in clinical practice, accounting for about 6% of total joint dislocations and 12% of shoulder injuries.

To compare and analyze the clinical effect of two different clavicular hook placement methods in the treatment of Rockwood typeⅢ,Ⅳ andⅤ acromioclavicular dislocations.

By comparing the treatment of Rockwood typeⅢ,Ⅳ andⅤ acromioclavicular joint dislocation with two different hook placement methods in the conventional group and the improved group, the differences in the acromioclavicular space and coracoclavicular space were compared between the two groups, and the VAS scores and Constant scores were compared as well.

All patients were followed up for an average of 13.4 months. There was no statistical difference in the coracoclavicular space between two groups. There were significantly statistical difference in the acromioclavicular space between two groups. The improved group was better in the VAS scores and Constant scores than that of conventional group.

Compared with the conventional method, the improved hook placement is more stable in the treatment of acromioclavicular dislocation. It has advantages in reducing the postoperative width of acromioclavicular joint and controlling its anteroposterior displacement, which provides a new idea for the application of clavicular hook plate in the treatment of Rockwood type Ⅲ, Ⅳ and Ⅴ acromioclavicular dislocations.