Lumbar Erector Spinae Plane Block and Fascia Iliaca Compartment Block After Total Hip Arthroplasty

The fourth lumbar vertebral level will be determined using the conventional method (the imaginary line between two crista iliacas). The convex transducer will be placed at the mid-vertebral line in the sagittal plane. The transducer will be shifted from the midline, 3.5-4 cm laterally, to the side of the surgery to visualize the erector spinae muscle and transverse process. Using the out-of-plane technique, a 22G/80-mm block needle will be advanced until it reached the transverse process. 0.5-1 ml of the prepared local anesthesia solution (30 ml bupivacaine 0.25%) will be administered, leading to hydro dissection to confirm the correct location. The needle will be repositioned by pulling back a few millimeters if resistance occurred when administering local anesthesia. All local anesthesia will be administered to this location between the transverse process and the erector spinae muscle

The transducer will be placed laterally to the femoral nerve. It then rotated 90 degrees to the sagittal plane, under ultrasound guidance, a regional block needle (22 G, 80 mm) will be introduced in the cranial direction. Once good needle alignment with the ultrasound beam is achieved, the needle will be inserted deep into the tissues until an optimal position of the needle tip is obtained. Needle location will be additionally verified by injecting 0.5-1 ml of the prepared local anesthesia solution and observing the solution spread within the tissues. Once the correct position of the needle tip is confirmed, the local anesthetic will be deposited under the iliac fascia to force its flow towards the lumbar plexus. 30 ml of bupivacaine 0.25% solution will be used for the block. local anesthesia will be administered as 5 mL boluses with a 20 second interval.