A Biomechanical Comparison between Salter Innominate Osteotomy and Pemberton Pericapsular Osteotomy

Objective: This study aims to compare the pelvic biomechanics of patients who underwent Salter innominate osteotomy (SIO) for one hip and Pemberton pericapsular osteotomy (PPO) for the other hip. Materials and Methods: Fifty-seven of 126 patients who received a one-stage procedure involving SIO for one hip and PPO for the other hip were included in this series. Preoperative x-rays, archived reports and patient recall were obtained and retrospectively analyzed for these 57 patients. Pelvic biomechanics of the two osteotomy techniques were compared on x-rays and computerized tomography imaging. Results: Based on x-rays, three hips with SIO and 1 hip with PPO had changes that could reflect unstable pelvic biomechanics. SIO caused an average lower limb discrepancy of 0.47 cm in all patients. Positive results were found in 5 patients at their most recent clinical examination. Conclusion: PPO affects the biomechanics of the pelvis much less than SIO. PPO demonstrated ideal biomechanical results compared with SIO, with fewer changes to the pelvic ring and the hip joints.