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Background and Aims Acetabular fractures, often resulting from high-velocity trauma, present challenges for administering neuraxial anaesthesia due to coexisting injuries, suboptimal positioning, or coagulopathy. This case study explores the feasibility and analgesic efficacy of continuous ultrasound-guided (USG) lumbar erector spinae plane block (ESPB) in such cases.Methods Five patients (3 males, 2 females; median age 55 years; ASA II–III) underwent posterior acetabular fracture repair by posterior approach under general anaesthesia. Subsequent to induction of general anaesthesia , USG guided continuous Lumbar ESPB was placed at L4 transverse process using a curvilinear probe and 100 mm 18G Contiplex® S Ultra 360 ,a catheter through needle system(B-Braun Medical™). Following placing catheter, 20 ml of 0.375% Inj Ropivacaine was administered in all the cases. Post-operatively, 20 ml of 0.2% of Inj ropivacaine was administered 8 hourly daily through the catheter for three days, along with IV Inj paracetamol 8 hourly. Pain was assessed using the Numerical Rating Scale (NRS); IV fentanyl was planned for rescue analgesia.Results Median NRS scores were 1(static) at rest and 3 on movement(dynamic). None of the patients required opioid rescue. Hemodynamic parameters remained stable throughout, and no complications related to the block were observed.Conclusions Continuous lumbar ESPB as an integral component of multimodal analgesia has the potential to reduces pain scores, minimise opioid use, and preserving motor function in patients undergoing acetabular fracture repair by the posterior approach. Further validation in larger randomized trials is recommended.