Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 6 3 2021 01 18 72 4 Babak Siavashi Department of Orthopedic Surgery, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Seyyed Hossein Shafiei Department of Orthopedic Surgery, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Farhad Mahdavi Department of Orthopedic Surgery, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Salar Baghbani Department of Orthopedic Surgery, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Mohammad Reza Golbakhsh Department of Orthopedic Surgery, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran 2020 08 27 2020 11 15 Background: Simultaneous ipsilateral floating knee and hip is a very rare injury and so far, no standard guideline has been determined for its treatment.   Case Report: In the current study, we report a surgical technique for the treatment of a 17-year-old patient with this condition on his left side. Conclusion: We recommend to start the fixation from proximal and stabilize the pelvic ring at first, then fix the posterior part of the acetabulum and femoral shaft with the same posterior approach. https://jost.tums.ac.ir/index.php/jost/article/view/209 https://jost.tums.ac.ir/index.php/jost/article/download/209/191