Abstract Background: Sacroiliac joint screw (SIJS) fixation is widely regarded as the gold standard for treating unstable posterior pelvic ring injuries. However, the technique presents notable challenges, including a high risk of neurovascular injury and a steep learning curve. This study aimed to introduce a novel Posterior Internal Fixation (P-INFIX) system and evaluate its biomechanical performance in the treatment of Denis zone I sacral fractures using finite element analysis.
