Department of Anesthesiology and Pain Medicine Ilsan Medical Center of Medicine University-do 10414 Korea;
Department of Anesthesiology and Pain Medicine National University Hospital College of Medicine 03080 Korea;
Department of Anesthesiology and Pain Medicine Bundang Medical Center of Medicine-do 13496 Korea;
Department of Anesthesiology and Pain Medicine Police Hospital 05715 Korea;
Department of Anesthesiology and Pain Medicine Kwandong University of Medicine St.Mary’s Hospital 22711 Korea;
Acromioclavicular joint; OSTEOARTHRITIS; Cross-sectional area; Diagnosis;