Effects of Fascia Iliaca Compartment Block and Femoral Nerve Block on Pain, Inflammation, and Stress Response in Hip Fracture Surgery

• Fascia iliaca compartment block provides superior postoperative analgesia compared with femoral nerve block in femoral neck and intertrochanteric fractures, but not in subtrochanteric fractures. • Fascia iliaca compartment block significantly reduces inflammatory and stress responses, as well as morphine consumption, and shortens time to first ambulation and hospital stay. • Block type, fracture type, age ≥75 years, and ASA grade III are independent predictors of analgesic effect. • A nomogram prediction model was developed and validated to guide individualized analgesic strategy selection.