Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 5 3 2020 10 16 75 9 Morteza Nakhaei Amroodi Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Iran University of Medical Sciences, Tehran, Iran Farzad Amouzadeh omrani Department of Orthopedic Surgery, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran Naser Ghanbari Department of Orthopedic Surgery, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran Melika Alaedini Research Assistant, Department of Orthopedic Surgery, Bone Joint and Related Tissue Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2020 05 06 2020 08 12 Proximal humerus fracture-dislocation is a rare condition that occurs mostly in young adults due to high energy trauma and about 60-79% of misdiagnosis occurred in the first diagnosis. In this article, we present two patients with proximal Humerus fracture-posterior dislocation whom their fractures have been diagnosed but even though after radiographic studies including x-ray and CT scan the posterior dislocation has been misdiagnosed. Also, complications, management, and avoidance of this misdiagnosis have been discussed. https://jost.tums.ac.ir/index.php/jost/article/view/179 https://jost.tums.ac.ir/index.php/jost/article/download/179/164