Ali Tabrizi1,2,3, Seyed Amir Mahlisha Kazemi Shishavan1,2,3. 1. Clinical Research Development Unit of Imam Khomeini Hospital, Department of orthopedics, Urmia University of Medical Sciences, Urmia, Iran. 2. Department of Orthopedics, Shariati Hospital. Tehran University of Medical Sciences, Tehran, Iran. 3. Research performed at Clinical Research Development Unit of Imam Khomeini Hospital, Urmia University of Medical Sciences, Urmia, Iran.