The study aims to confirm the non-inferiority of PENG block vs intrathecal morphine in patients undergoing total hip arthroplasty under spinal anesthesia. Non-inferiority will be assessed regarding maximum pain on a numerical rating scale at rest and during active hip flexion and regarding cumulative morphine consumption during 48 postoperative hours. Impact on quadriceps muscle motor function and side effects including pruritus, nausea and vomiting and hypotension will also be assessed.
To compare the impact of pericapsular nerve group (PENG) block to intrathecal morphine on postoperative analgesia, motor function and side effects in patients undergoing primary total hip arthroplasty under spinal anesthesia.