Abstract: Objective To explore the application of AO collar bone hook titanium plate in treating Rockwood Ⅲ°-Ⅵ° acromioclavicular joint disorder.Methods Twenty-seven patients with Rockwood Ⅲ°-Ⅵ° acromioclavicular joint disorder were treated using AO collar bone hook titanium plate.After the replacement of acromioclavicular joint fixed by AO collar bone hook titanium plate,the joint capsule,shoulder lock ligament and beak lock ligament were also fixed.Results All the patients were healed by first intension,the acromioclavicular joint disorder were corrected and no complications occurred.All the patients were followed for 6-15 months.The AO collar bone hook titanium plate were taken out 3-6 months after surgery.Function of the acromioclavicular joint was estimated by Karlsson criteria: the results were excellent in 23 cases,good in 3 cases and poor in 1 case.Choiceness rate was 96.8%.Conclusion Using AO collar bone hook titanium plate in treating Rockwood Ⅲ°-Ⅵ° acromioclavicular joint disorder could minimize the surgical trauma,and early functional exercise could be performed.It should be advocated.

Key words: Acromioclavicular joint, Dislocation, Collar bone hook titanium plate