en تروما Trauma پژوهشی Research Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Tahoma;"><span style="line-height:2;"><strong>Background</strong>: Intramedullary nail (IMN) usage is a proposed method for fixing long bone fractures. Distal nail screw implantation can be achieved through two methods, the conventional C-arm method and the C-arm-based navigation method.<br> <strong>Objectives</strong>: This study aims to compare the two mentioned methods in terms of their consequences, such as duration of operation, times of radiation exposure, and the success rate of screw implantation in patients with femur or tibia fractures.<br> <strong>Methods</strong>: This randomized clinical trial involved 44 patients with femur or tibia fractures, equally divided into control and intervention groups. The conventional C-arm method and C-arm-based navigation method were respectively used in the control and intervention groups for distal Kuntscher screw implantation. The radiation exposure times, the duration of surgery, the number of attempts to implant each screw, and the success rate of each screw implantation were recorded.<br> <strong>Results</strong>: The success rate and duration of distal nail screw implantation were almost the same in the study groups. However, using the C-arm-based navigation method significantly reduced the amount of radiation exposure.<br> <strong>Conclusion</strong>: Using navigation as a new technology in orthopedics may have a beneficial impact on the process of distal IMN screws implantation.&nbsp;</span></span></span></div> Orthopedics, Fracture of the long bones of the lower limb, Intramedullary nail (IMN), Navigation, Distal locking screw 201 208 http://jros.iums.ac.ir/browse.php?a_code=A-10-962-1&slc_lang=en&sid=1 Mohammad Hossein Nabian dr.nabian@gmail.com 10031947532846006900 10031947532846006900 No Department of Orthopedic and Trauma Surgery, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. mehdi komijani dr.m_komijani@yahoo.com 10031947532846006901 10031947532846006901 No Department of Orthopedic and Trauma Surgery, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Mohammad Hasan Sharafi sharafi.mohamadhasan@gmail.com 10031947532846006902 10031947532846006902 No Department of Orthopedic and Trauma Surgery, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Ramin Shayan-Moghadam ramin.sh7293@gmail.com 10031947532846006903 10031947532846006903 No Department of Orthopedic and Trauma Surgery, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Yosef Mehrabi yosef.mehrabi@gmail.com 10031947532846006904 10031947532846006904 No Department of Orthopedic and Trauma Surgery, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Erfan Babaei Nejad erfan_8474@yahoo.com 10031947532846006905 0009-0001-1753-8849 Yes Department of Orthopedic and Trauma Surgery, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.