Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 6 4 2021 03 29 86 7 EN Alireza Ghaznavi Department of Orthopedics Surgery, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran. Shayan Amiri Department of Orthopedics Surgery, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran 2020 09 25 2020 11 27 This is an educational corner and it does not have an abstract. https://jost.tums.ac.ir/index.php/jost/article/view/223 https://jost.tums.ac.ir/index.php/jost/article/download/223/198