PURPOSE: To evaluate the follow-up result of 11 cases that were operated with internal fixation of scapular neck and internal fixation of clavicle or acromioclavicular dislocation for severely displaced floating shoulder which was high energy injury and unstable. MATERIALS AND METHODS: We examined the scapular neck fracture with clavicle fracture or acromioclavicular joint dislocation by multidisciplinary research from August 1997 to July 2004. The scapular neck fractures were operated in the case of translational displacement of more than 25 mm and angular displacement of more than 45 degrees with 3.5 mm reconstruction plate fixation and internal fixation for clavicle fracture or acromioclavicular joint perpormed simultaneously. And we evaluated 11 cases that can be followed up for more than 9 months. RESULTS: We achieved bony union in all cases. In ASES functional score, we got average 89.2 (75~95) points. In Rowe functional score, we got average 89.1 (75~100) points. In complication, there was external rotation weakness in 1 case. CONCLUSION: In severely displaced floating shoulder due to high energy injury, we got good clinical and functional result after internal fixation for scapular neck and clavicle or acromioclavicular joint.