PENG Block and Lateral Femoral Cutaneous Nerve Block For Hip Replacement Surgery

During and after the surgery, a group of patients received intravenous morphine analgesia via PCA (concentration 1mg/ml, bolus dose of 1mg, lock time 10 minutes, maximum dose 10mg/4 hours). The remaining group of patients receive pain relief by PENG block and LFCN block. In this group, the ultrasound probe was placed horizontally from the anterior superior iliac spine, and was moved along the femoral arc defining the pubic spine. Then, the transducer was rotated 45 degrees, moved parallel to the femoral arch identifying the anterior inferior iliac spine (AIIS), iliopubic eminence (IPE) and inferior lumbosacral head. The ultrasound probe was moved lightly until the upper end of the femoral head was identified. Next, a 120 mm Tuohy 18G anesthetic needle was used under ultrasound guidance, which was moved lateral to medial in the plane between the ultrasound transducer and the superior tip of the femoral head. Then, 10 mL of ropivacaine 0.25% was injected through the anesthetic needle tip