Impact of Anterior Iliopsoas Space Block Versus PENG Block on Ease of Positioning for Spinal Anathesia in Patients Undergoing Hip Surgeries ;Randomized Clinical Trial

Total hip arthroplasty (THA) has been one of the most significant advancements in orthopedic surgery over the past century. hip fractures are typically associated with severe pain, effective analgesia is crucial both before and after surgery.

Consequently, efforts are made to facilitate enhanced recovery profiles to reduce postoperative pain in THA patients. At present, multimodal analgesia approaches have been used for pain management after THA, including oral analgesia, epidural analgesia, and peripheral nerve block.

Spinal anesthesia (SA) is the most commonly employed method of anesthesia for repairing these fractures. The intense pain resulting from the fracture can impede the optimal positioning required for these procedures , rendering access to the subarachnoid space challenging. Suboptimal postoperative analgesia may restrict limb mobility, consequently delaying recovery and increasing opioid consumption. Therefore, it is imperative to establish effective perioperative analgesia strategies that not only reduce the reliance on opioids but also mitigate their adverse effects, particularly in this patient population .

Based on previous anatomical studies, it has been established that the articular branches of the femoral nerve, the obturator nerve, and the accessory obturator nerve (AON) play a crucial role in innervating the anterior hip capsule. Consequently, these nerves are identified as the primary targets for hip analgesia, and their effective blockade can be achieved through the peri-capsular nerve group (PENG) technique .

Recently, The anterior iliopsoas space block is a considered as a novel technique that targets the lumbosacral trunk as it passes beneath the psoas major muscle, offering potential advantages over the traditional sacral plexus block, which is performed in the supine position.