A Comparison of Quadriceps Muscle Weakness Associated With PENG Blockade or Femoral Nerve Blockade for Patients Undergoing Neck of Femur (NOF) Fracture Surgery

Neck of femur (NOF) fracture is a common presentation to the emergency department, particularly in our older population.1.NOF fracture is associated with a high social and economic cost with significant effects on patients' quality of life

The latest Irish Hip Fracture Database (IHFD) report from 2019 detailed 3,701 NOF fractures in patients over 60 years of age in Ireland and 437 of these patients attended CUH.2 This frail and vulnerable group had an average age of 81 and many people suffered numerous co-morbid conditions. 3 This population of patients is therefore at significant risk of complications and require multidisciplinary input to optimise clinical outcome

From a patient's perspective, NOF fracture is a very painful condition, requiring early surgical fixation. It is associated with significant morbidity and mortality. In 2019, 5% of patients who sustained a hip fracture in Ireland died, an additional 4% of patients required new admission to a nursing home following this fracture and a further 13% required convalescent care3

These patients are also particularly at risk for under-treatment of pain. Contraindications to many commonly used analgesics such as non-steroidal anti-inflammatory drugs (NSAIDs) exist in this population, including renal dysfunction in 40%5. Older adults suffer more adverse effects from opiate analgesia such as nausea, vomiting, constipation, drowsiness and respiratory complications. This population also have a 25% incidence of cognitive impairment which may make communication and assessment of their pain more challenging. 1, 3 Under-treated pain also confers a 9 fold increased risk of delirium in cognitively intact patients14

Peripheral nerve blocks (PNB) have been extensively researched in this group of patients with a view to improving the quality of pain relief while reducing the side effects of analgesic medications used. In 2017, a Cochrane review on PNB in the management of patients with NOF fractures concluded that there was high quality evidence that PNB reduces pain on movement within 30 minutes after block placement and reduces opioid consumption and moderate quality evidence that PNB reduces the incidence of pneumonia, time to first mobilization and cost. 6