Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 8 2 2022 05 28 69 71 Mir Mansour Moazen Jamshidi Joint Reconstruction Research Center, Tehran University of Medical Sciences, Tehran, Iran; Zanjan University of Medical Sciences Alireza Moharrami Department of Orthopedic Surgery, Joint Reconstruction Research Center, Tehran University of Medical Sciences, Tehran, Iran Pouya Tabatabaei Irani Department of Orthopedic Surgery, Joint Reconstruction Research Center, Tehran University of Medical Sciences, Tehran, Iran Mohammad Ali Ghasemi Joint Reconstruction Research Center, Tehran University of Medical Sciences, Tehran, Iran Amir Reza Mafi Joint Reconstruction Research Center, Tehran University of Medical Sciences, Tehran, Iran SM Javad Mortazavi Department of Orthopedics, Joint Reconstruction Research Center, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran 2021 11 09 2022 02 26 Background: This study aimed to present a rare case of a failed dynamic hip screw (DHS) used for fixation of intertrochanteric fracture sliding into the pelvis and to review the most common causes of DHS failure in order to prevent this from happening in the future. Case Report: A 68-year-old woman was referred to the orthopedics clinic with left hip pain and limping from 6 months ago. In our evaluation, she had DHS failure and intrapelvic protrusion. Conclusion: There have been several  aspects  of the previously described  DHS failure. We performed a two-stage total hip arthroplasty (THA) for the patient with a good one-year follow-up in the present case. https://jost.tums.ac.ir/index.php/jost/article/view/330 https://jost.tums.ac.ir/index.php/jost/article/download/330/271