Medicolegal Risk Assessment and Mitigation Strategies for Ultrasound‐Guided Nerve Blocks in Emergency Medicine

Ultrasound-guided nerve blocks (USGNBs) are increasingly used in the emergency department (ED) as a safe and effective part of multimodal pain management. Their use has been shown to reduce reliance on opioids and procedural sedation, improve pain scores, and enhance functional outcomes for patients. Additionally, USGNBs in the ED have a complication rate of 0.4%, markedly lower than procedural sedation (4-11%), and they significantly reduce opioid requirements, which is critical considering the current opioid epidemic and the risks of persistent opioid use and overdose. Despite these benefits, relevant concerns about medicolegal liability, informed consent, evolving standards of care, may still influence the adoption of USGNBs in clinical practice. To address these issues, this review examines the legal risks associated with USGNBs by drawing on current clinical literature, closed claims data, and case law. We highlight common adverse events such as peripheral nerve injury and local anesthetic systemic toxicity and assess their legal implications. Potential legal risk including liability related to alternatives like opioid use and procedural sedation, are discussed. While the risk of litigation remains low when best practices are followed, failing to offer a USGNB when clearly indicated may increasingly be viewed as a liability if preventable complications occur. This article aims to provide a practical, interdisciplinary framework, including legal risk assessment, training, credentialing, and risk mitigation, to help clinicians, educators, and hospital administrators safely and confidently integrate USGNBs into ED practice.