Emerging Techniques in Lumbopelvic Fixation: Biomechanical and Clinical Perspectives

The lumbopelvic junction is a biomechanically complex region that necessitates robust stabilization, especially following spinopelvic dissociation, unstable sacral fractures, or sacrectomy. Lumbopelvic fixation techniques, such as triangular osteosynthesis and dual S2-alar-iliac (S2AI) screw placement, optimize load transfer, restore spinal-pelvic continuity and reduce mechanical failure risks. Triangular osteosynthesis achieves up to 80% of native spine stiffness under load, while dual S2AI screws restore up to 96% stiffness and show lower screw loosening rates than single screws. Comparative studies reveal that S2AI screws outperform traditional iliac screws in biomechanical stability, pullout strength and reduced hardware-related complications. Multi-rod and quad-rod constructs further enhance construct rigidity, distribute mechanical stress and lower the risk of rod breakage and revision surgeries. Novel anchoring strategies, including sacral hooks and clamps, contribute to improved stability in cases with complex fractures or bone loss. The integration of navigation and robotics ensures higher accuracy in screw placement, minimizes complications and enhances surgical precision. Collectively, these advancements facilitate early mobilization, improved fusion rates, superior pain relief and better functional outcomes, underscoring the evolving landscape of lumbopelvic fixation strategies.