Supra Inguinal Fascia Iliaca Block Versus Ultrasound-guided Caudal Analgesia for Pediatrics Undergoing Anterior and Lateral Thigh Surgeries: A Randomized Controlled Trial

After assessment of eligibility criteria, a clinical nurse independent of the protocol will obtain the randomization number and patients will then be randomized in the two groups. Treatment allocation will follow the order of a predetermined randomization list and will be generated using random blocks. Randomized will be done through computer program with patient blinded to the type of intervention (single blinded).

1. Group C: in this group children will receive US-guided caudal analgesia (CA) after GA. The caudal block will be performed by visualizing the sacral hiatus at the level of the sacral cornu after placing the probe transversely obtaining a short axis view, two hyperechoic lines will appear between the sacral cornu the superficial line is the sacrococcygeal ligament which will be pierced by the needle 22-gauge echogenic non-stimulating 5-cm needle (Ultraplex; B. Braun Medical Bethlehem PA, USA) using the out-of-plane approach. After confirming the absence of any blood or cerebrospinal fluid in the aspiration the caudal mixture (1 mL/kg of 0.25% bupivacaine a maximum volume of 20 mL will be used) will be injected. 2. Group B: in this group children will receive lower limb peripheral nerve blocks in the form of US-guided fascia iliaca Block.

American Society of Anesthiologists recommends monitors, intravenous line, and O2 (3 L/min) through the nasal cannula will be used. All blocks will be executed under the guidance of a 5-13 MHz linear ultrasound probe covered in a sterile sheath and attached to a Sonosite (M- Turbo; SonoSite Inc. Bothell WA USA) portable ultrasound machine. Preoperatively the maximum dose of bupivacaine will be calculated (2 mg/kg) so as not to exceed the dose during injection in either group.