en جراحی هیپ Hip surgery پژوهشی Research Article <div style="text-align: justify;"><strong>Background</strong>: Acetabular fractures are common traumatic injuries globally, posing challenges owing to their complex nature and difficulties in achieving precise anatomical reduction. Total hip arthroplasty (THA) is a valuable treatment for posttraumatic osteoarthritis secondary to these fractures; however, outcomes can vary based on initial fracture management, and optimal strategies remain debatable.<br> <strong>Objectives</strong>: This study evaluates THA outcomes in patients with previous acetabular fractures managed with open reduction and internal fixation (ORIF).<br> <strong>Methods</strong>: We conducted a retrospective review of patients who underwent THA for posttraumatic osteoarthritis following acetabular fractures managed with ORIF. The inclusion criteria comprised osteoarthritis graded &ge;III according to the Kellgren-Lawrence classification and a minimum two-year follow-up. Clinical outcomes were assessed using the Harris hip score (HHS).<br> <strong>Results</strong>: Sixty-eight patients who underwent THA after ORIF for acetabular fractures were included (mean age 52.5&plusmn;13.8 years). Preoperative HHS improved significantly from 41.4&plusmn;9.9 to 83.1&plusmn;10.4 at the final follow-up (P<0.001). Postoperative complications occurred in 54.4%, with 11.8% requiring revision THA.<br> <strong>Conclusion</strong>: THA for posttraumatic osteoarthritis following acetabular fractures, particularly in patients managed with ORIF, shows significant clinical improvement but has a high complication rate.&nbsp;</div> Acetabular fracture, Total hip arthroplasty (THA), Osteoarthritis, Open fracture reduction 145 154 http://jros.iums.ac.ir/browse.php?a_code=A-10-962-3&slc_lang=en&sid=1 Amir Aminian amir_aminian@yahoo.com 10031947532846007538 10031947532846007538 No Department of Orthopedics, Bone and Joint Reconstruction Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. Mohammadreza Bahaediniv Mrbahaeddini@yahoo.com 10031947532846007539 10031947532846007539 No Department of Orthopedics, Bone and Joint Reconstruction Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. Mehdi Komijani dr.m_komijani@yahoo.com 10031947532846007540 10031947532846007540 Yes Department of Orthopedics, Bone and Joint Reconstruction Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.