Compare the clinical and radiological outcome between the arthroscopic and open surgical repair using suture button device method in cases with acute AC joint disruption
Age of 16 to 60 years
Definite radiographic diagnosis of isolated Rockwood type IIIb(unstable), IV and type v acromioclavicular joint dislocation
Time from injury to operation < 3 weeks
Patient with complete at least 12-month follow-up assessments
. Age outside the range
Open injury, old injury (≥ 3 weeks since injury)
Injury caused by other diseases (tendinitis, metabolic, et al.), concurrent shoulder osteoarthritis, arthropathy or any fracture
Any previous operation of the injured limb