96 Patients will be assessed thoroughly for history (to exclude previous medical history, previous anesthesia, with/without perioperative complications, smoking status, cardiorespiratory disorders or bleeding disorders), examination (for the full primary and secondary trauma survey to exclude any coexisting trauma that threatens patient life, laboratory (for CBC, bleeding tendencies, serology, kidney dysfunction and availability of blood transfusion) and radiological (for cardiac assessment, and exclusion of other trauma). ASA score then to be determined. Full monitoring of the patient will be recorded, basically, HR, ECG, SpO2, NIBP, EtCO2, temperature. Peripheral vein cannula will be secured and the fluids will be infused as 10- 15ml/kg before induction of anesthesia. Choice of type of anesthesia will be established according to every individual patient, but spinal anesthesia will be preferred over general anesthesia. The block will be administered under supervision of the supervisor senior staff before induction of anesthesia. Type of the block will be randomly assigned into two groups according to website computer program randomization program to distribute cases into two groups using their order number:
1. Group (A) will receive PENG + LFCN block: The low-frequency curvilinear probe (3-5 MHz) of ultrasound (GE Logiq e, GE Health care, USA) will be placed in a transverse plane over the anterior inferior iliac spine (AIIS) and aligned with the pubic ramus by rotating the probe counterclockwise to obtain a hyper-echoic bright line, which is the iliopubic eminence (IPE). In this view, the iliopsoas muscle and psoas tendon, the femoral artery, and pectineus muscle can be observed. Using the in-plane injection technique, a 22G, 80 mm insulated block needle was inserted in a lateral-to-medial direction, and the tip will then be placed between the psoas tendon anteriorly and the pubic ramus posteriorly. After no blood was drawn back, the LA (20 ml, 0.25% bupivacaine) will be injected to get an image of the psoas tendon uplifted. After the PENG block is performed, a high-frequency linear probe (6-12 MHz) will be placed on the inguinal ligament to get a short-axial view of femoral artery, then the probe is moved laterally to identify the sartorius muscle, the tail of the probe will be positioned toward the anterior superior iliac spine to observe the LFCN covered by fascia between sartorius and tensor fascia lata. After no blood can be withdrawn back, the LA (10 ml, 0.25% bupivacaine) will be injected following negative aspiration
2. The second group (B): S-FICB: A high-frequency linear probe (6-12 MHz) of ultrasound (GE Logiq e, GE Healthcare, USA) will be used. The probe is placed adjacent to the inguinal ligament with its long axis parallel to the ligament. After the femoral artery and the femoral nerve will be observed, the probe will be moved laterally to identify the sartorius muscle and placing it at the center of the screen. Then the probe will be moved cephalically to the anterior superior iliac spine (ASIS) until the image of the sartorius muscle will disappear, and the medial side of ASIS was identifed as the iliacus muscle. Next, by rotating the medial end of the ultrasound probe toward the umbilicus, the ASIS, iliac bone, and abdominal muscles will be observed on the screen. Using the in-plane technique, a 22G, 80 mm insulated block needle will be inserted in a lateral-to-medial direction. When the needle tip will penetrate below the fascia iliacus, the LA (40 ml, 0.25% bupivacaine) will be injected following negative aspiration to obtain an image showing the LA spread between the iliacus muscle and the fascia iliacus.
