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Abstract Background: Hip arthroplasty surgery is usually associated with severe postoperative pain. Several modalities are usually used for postoperative analgesia in these patients, those include; intravenous analgesia, neuroaxial analgesia and peripheral nerve blocks. . Erector spinae plane (ESP) block is one of the interfascial plane blocks that target the dorsal and ventral rami of the spinal nerves . Recent studies demonstrated effective postoperative analgesia for ESPB after thoracic and abdominal surgeries. Fascia iliaca block is one of the most common techniques for pain control after hip surgeries; it can be regarded as an anterior approach of the lumbar plexus. It provides analgesia through spread of local anaesthetic to the fermoral and lateral cutaneous femoral nerves Methods: Fifty four patients aged 18-65 years old, ASA physical status III, and scheduled for hip replacement surgeries under subarachnoid block (SAB) were included in the study and classified to one of three groups (ESPB group and FIB group). Postoperative pain was assessed by the visual analogue score at 2, 4, 6, 12, 18, and 24 hours postoperatively and the total 24-hours morphine consumption was recorded. Results: We reported that both FIB and ESPB were effective at providing early postoperative analgesia after hip arthroplasty surgeries with comparable static and dynamic VAS in the first 24 hours postoperative, However the dynamic VAS at 12 and 18 hours postoperatively was lower in FIB group. FIB showed less opioid consumption and longer duration of analgesia in the first postoperative 24 hours ,While the motor power was more preserved in ESPB. Conclusion: Both suprainguinal FIB and ESPB, provided effective postoperative analgesia after THA in early hours. FIB showed lower 24- hour morphine consumption and longer duration of analgesia while ESPB provide safe and easy technique with preserved motor power. |