Pericapsular Nerve Group (PENG) Block vs. the Fascia Iliaca Compartment (FIC) Block for Patients With Isolated Hip Fractures in the Emergency Department

Ultrasound-guided nerve blocks are an important tool for treating pain due to orthopedic injury in the ED. They provide long lasting, opioid-sparing pain relief that is generally safe and well-tolerated by patients1. Elderly patients with hip fractures commonly present to the ED, and their injury can be painful. Commonly used opioid pain regimens can have deleterious side effects, especially in elderly patients, like somnolence, delirium, hypotension and respiratory depression.

The fascia iliaca compartment (FIC) block has become a familiar technique to emergency physicians as a pain control treatment for hip fractures. The pericapsular nerve group (PENG) block has recently been proposed as a novel method to treat pain due to hip, acetabular and pelvic fracture by targeting the terminal sensory articular nerve branches of the femoral nerve (FN), obturator nerve (ON), and accessory obturator nerve (AON). At this time there has been no study comparing the efficacy of the two nerve blocks, PENG and FIC.

This aim of this study is to compare the efficacy of the PENG block (20mL of Bupivacaine 0.50%) to that of the FIC block (40mL of Bupivacaine 0.25%) for patients with hip fractures in the ED. Our hypothesis is that PENG will demonstrate analgesia that is non-inferior to FIC. Subjective pain scores on a scale of 0 to 10 will be assessed before and after the block. All subjects will receive 4mg of morphine after consent and prior to the block.

A secondary aim is to show that the PENG block is preferable to the FIC block because it does not target motor nerves, thus preserving motor function allowing for an accurate neurological exam and hopefully providing for earlier ambulation. Also, we aim to determine if PENG block results in an significant reduction in amount of systemic pain medication needed for the patient.

This is a single-centered, prospective, randomized, blinded study involving patients who present to the ED with an isolated hip fracture. Patients who meet inclusion criteria will be consented for the study and then randomized to receive either a FIC block or a PENG block. Patients who are potentially to be enrolled in the study will receive standardized systemic analgesia while awaiting x-rays. If needed, patients will be administered morphine for breakthrough pain after the nerve blocks are placed. The exception to this standardization will be patients with a morphine allergy.