Comparison of the Effects of Pericapsular Nerve Group (PENG), Suprainguinal Fascia Iliaca Compartment (S-FICB) and 3-1 Blocks on Comfort in Positioning for Unilateral Spinal Anesthesia and Postoperative Pain in Hip Fracture Surgery

In the study, one anesthesiologist (Anesthesiologist A) will perform the relevant peripheral blocks according to the groups to which the patients are randomized; the other anesthesiologist (Anesthesiologist B) will perform unilateral spinal anesthesia in all patients blinded to the peripheral blocks.

On the day of surgery, the patients will first be taken to the block application room and standard monitoring (ECG, pulse oximetry, noninvasive blood pressure) will be applied in the supine position. In the pre-block period, individual pain assessment will be performed with the Visual Analog Scale (VAS - 0 cm = no pain / 10 cm = unbearable pain) and recorded on the case report form. After the pain assessment, disinfection of the block area will be performed with 10% povidone iodine (Batidex) in accordance with surgical sterilization rules. After sterilization, the relevant peripheral block will be performed by Anesthesiologist A under USG guidance. Intermittent negative aspiration will be performed during all interventions to detect possible vascular puncture. All groups will receive 30 ml of local anesthetic solution containing 5 mcg/ml adrenaline and bupivacaine at 0.25% concentration.

Group 1 (PENG Block): Convex USG Probe (1-5 mHz) is placed transversely on SIAS (Spina Iliaca Anterior Superior). The probe is then rotated 45 degrees and aligned with the pubic ramus. In this position, the iliopubic eminence, ilipsoas muscle-tendon, femoral artery and pectineus muscle are observed. A 100 mm 21G block needle (Stimuplex A®:B. Braun Melsungen AG, Japan) is inserted in-plane from lateral to medial to the musculofascial plane with the psoas tendon in front and the pubic ramus behind and the injection is performed.

Group 2 (Suprainguinal Fascia Iliaca Compartment Block) : Linear USG Probe (7-13 mHz) is placed parasagittal to obtain an image of the SIAS. The probe is then shifted medially to identify the fascia iliaca, iliac muscle, internal oblique muscle and deep circumflex iliac artery. A 50 mm 21G block needle (Stimuplex A®:B. Braun Melsungen AG, Japan) is advanced in-plane from caudal to cephalic and injected between the fascia iliaca and iliac muscle.

Group 3 (3-1 Block) Linear USG Probe (7-13 mHz) is placed at the femoral fold and femoral vein-arterial-nerve is visualized. The femoral nerve is located below the fascia iliaca. At this point, a 50 mm 21G block needle (Stimuplex A®:B. Braun Melsungen AG, Japan) is inserted in-plane from lateral to medial and injected lateral to the femoral nerve. After injection, pressure is applied distal to the needle entry site to spread the local anesthetic proximally in the nerve sheath.