Acromio-clavicular Dislocation Type III - Conservative Treatment Versus Surgical Hook Plate Treatment

Inclusion Criteria: * men or women ≥ 18 years-old; * AC joint dislocation type III with Zanca X-ray view demonstrating CC distance of 200%; * trauma-surgery delay of less than 14 days; * consent form signed. Exclusion Criteria: * AC joint dislocation type I, II, IV, V or VI; * associated neuro-vascular damage; * men or women \> 60 years-old; * open dislocation; * local skin damage; * dislocation in a polytrauma patient; * floating shoulder; * fracture of the ipsilateral or controlateral arm or shoulder girdle; * fracture of the coracoid process of the scapula; * history of previous surgery to the shoulder; * medical condition preventing surgery; * men or women unfit to consent; * any other condition that make the examinator thinks that the follow up would be problematic.