en تخصصي Special پژوهشي Research distal radius fracture is the most common fracture of the long bones in adults and is quite prevalent amongst orthopedic patients.Methods: This is a randomized clinical trial conducted with recruiting 70 patients suffered from comminuted distal radius fractures. The study was carried out in Imam Khomeini Hospital, Sari, Iran, in 2011 and 2012.Results: All patients in the external fixator group (37 patients) showed the radiographic features of the ::union:: while only 29 patients in the pin & plaster group (93.5%) manifested evidence of ::union:: (p= 0.117). Only 4 patients (10.8%) in the external fixator group and 7 patients in the pin and plaster group had mal-::union:: (p= 0.189). Eight patients (11.8%) had infection of the pin site, 2 patients (5.4%) in the external fixator and 6 patients (19.4%) in the pin and plaster group.Conclusion: According to the results of this study, external fixator had fewer side effects in comparison to the pin and plasters surgery and is a preferred treatment for comminuted distal radius fractures. Moreover, this technique is associated with better clinical and functional outcome. distal radius fracture, external fixator, pin and plaster 0 0 http://intjmi.com/browse.php?a_code=A-10-1-40&slc_lang=en&sid=1 Masoud ShayestehAzar 1003194753284600169 1003194753284600169 Yes Department of Orthopedic Surgery, Imam Khomeini Hospital, Mazandaran University of Medical Sciences, Sari, Iran. Majid Sajadi 1003194753284600170 1003194753284600170 No Department of Orthopedic Surgery, Imam Khomeini Hospital, Mazandaran University of Medical Sciences, Sari, Iran. Mohammad Hossein Kariminasab 1003194753284600171 1003194753284600171 No Department of Orthopedic Surgery, Imam Khomeini Hospital, Mazandaran University of Medical Sciences, Sari, Iran. Seyed mohamad Mehdi daneshpoor 1003194753284600172 1003194753284600172 No Department of Orthopedic Surgery, Imam Khomeini Hospital, Mazandaran University of Medical Sciences, Sari, Iran. Mehran Fazli 1003194753284600173 1003194753284600173 No Faculty of medicine, Student research committee, Mazandaran University of medical sciences, Sari, Iran. Elnaz Kasiri 1003194753284600174 1003194753284600174 No Faculty of medicine, Student research committee, Mazandaran University of medical sciences, Sari, Iran. Shadi ShayestehAzar 1003194753284600175 1003194753284600175 No Faculty of medicine, Student research committee, Mazandaran University of medical sciences, Sari, Iran.