en جراحی هیپ Hip surgery مروری Review Paper Total hip arthroplasty (THA) is a transformative surgical procedure that addresses debilitating hip conditions such as fractures and osteoarthritis, especially in the aging population. Optimal acetabular positioning plays a pivotal role in achieving successful outcomes by influencing joint stability, range of motion, and implant longevity. This review synthesizes recent advancements in surgical techniques, including robotic-assisted systems, patient-specific instrumentation (PSI), and personalized orthopedics, to address challenges such as malpositioning, dislocation, and implant wear. Key factors affecting acetabular alignment—such as the center of rotation, angular positioning, and pelvic tilt—are explored, along with the role of preoperative optimization in enhancing patient outcomes. Furthermore, emerging technologies like 3D printing, advanced imaging, and multimodal analgesia are discussed for their impact on precision and recovery. By integrating biomechanical insights and innovation, this review highlights the potential to minimize complications and improve the durability and effectiveness of THA. Total hip arthroplasty (THA), Acetabular positioning, Biomechanics, Personalized orthopedics, Robotic-assisted surgery, 3D printing, Implant longevity, Preoperative optimization 13 40 http://jros.iums.ac.ir/browse.php?a_code=A-10-1799-2&slc_lang=en&sid=1 Kaveh Gharanizadeh Kaveh.gharani@gmail.com 10031947532846008314 10031947532846008314 No Department of Orthopedics, Bone and Joint Reconstruction Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. Khatere Mokhtari khatere_mokhtari@yahoo.com 10031947532846008315 0009-0002-1179-4769 No Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran. Siamak Kazemi Dr.s.kazemisufi@gmail.com 10031947532846008316 10031947532846008316 Yes Department of Orthopedics, Bone and Joint Reconstruction Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.