This prospective randomized controlled trial aims to compare the efficacy and safety of robot assisted minimally invasive treatment versus conventional surgery in elderly patients with FFP3-4 fragility fractures of the pelvis. Eligible patients will be stratified according to FFP classification and randomly assigned in a 1:1 ratio to receive either robot assisted minimally invasive fixation or conventional surgical treatment. Primary and secondary outcomes include pain relief, early mobilization, functional recovery, perioperative complications, venous thromboembolism events, laboratory parameters, imaging outcomes, and healthcare resource utilization. The study aims to provide evidence for optimizing surgical treatment strategies in elderly patients with unstable pelvic fragility fractures.