Abstract Background: The acromio-clavicular (AC) joint stability depends on the acromio-clavicular ligaments, the coraco-clavicular (CC) ligaments,and the joint capsule. Treatment of acute type III injuries still controversial We evaluated the results of conservative treatment of type III AC joint dislocation according to clinical and radiological outcome. Patients and Methods: This prospective study included fifteen patients with acute  acromio-clavicular joint dislocations type III. There were one woman and fourteen men, with an average age of 29.7 ±10.2 years. All patients underwent clinical assessment according to Constant score and a radiographic study (antero-posterior showing both shoulders, axillary views).All patients were treated conservatively and followed up for 6 months . Results: Eleven patients out of fifteen were satisfied. The mean constant score improved from39.6 ± 8.2 at the time of trauma to 87.3 ± 10 after 6 months follow up with statistically significant difference (p < 0.001). The mean of Corac-Clavicular distance difference improved from 58 ± 18.8 at time of trauma to 39.7 ± 8 after 6 months. Conclusion: Conservative treatment of acromio-clavicular joint dislocation type III gives acceptable results with a low rate of complications especially in early diagnosed and treated patients, with sedentary life, and with less widening of Corac-Clavicular  distance.