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Please confirm that an ethics committee approval has been applied for or granted: Yes: I’m uploading the Ethics Committee Approval as a PDF file with this abstract submissionBackground and Aims The lumbar plexus is an effective technique for pain management in total hip replacement surgery. Pericapsular nerve group block (PENG) has also shown its effectiveness. Currently, fast-track surgical programs require pain management strategies that preserve quadriceps strength, for physiotherapy or same-day discharge. No evidence was found comparing these two approaches regarding pain or muscular strength.Methods Approval from the ethics committee and informed consent was obtained. The patients scheduled for primary total hip arthroplasty under spinal anesthesia were randomized into two groups. Group A received 20 ml 0.25% of levobupivacaine for lumbar plexus block, and in post anesthesia care unit (PACU) 20 ml of saline for PENG block. Patients in Group B 20 ml of saline for the lumbar plexus, and in PACU 20 ml of levobupivacaine 0.25% for the PENG block. Pain was assessed using the visual analogue scale (VAS), opioid consumption was recorded, and quadriceps strength was evaluated with the Oxford scale at 2 hours and between 24 to 72 hours postoperativelyResults 33 patients were enrolled, randomized 14 to group A and 19 to group B, no demographic differences registered. No significant differences were found in VAS pain scores during rest and movement or in opioid consumption. The motor quadriceps strength was significantly less just in the PACU evaluation for lumbar plexus blockConclusions Both blockades effectively control postoperative pain in total hip replacement surgery. The lumbar plexus block affects quadriceps motor function during the first hours. PENG block could be a more suitable strategy for fast-track surgeries