18 patients with displaced extension type supracondylar humerus fractures underwent open reduction and internal fixation operation via medial aproach at the University of Trakya, School of Merlicine, Department of Orthopaedic Surgery. The surgical treatment of supracondylar fractures via medial approach in chi/dren has the advantages of better cosmetic appearance of skin incision, low complication rate regarding ulnar nerve, easy and safe applying lateral Kirschner wire percutaneously.