Motor-sparing peripheral nerve blocks have emerged as an important regional anesthesia strategy for hand surgery because they provide effective analgesia while preserving motor function, allowing patients to maintain meaningful movement throughout the perioperative period without compromising anesthetic efficacy. Unlike conventional brachial plexus blocks, which often produce dense blockade of the upper extremity, these techniques selectively anesthetize the sensory innervation of the hand through distal blockade of the median, ulnar, and superficial radial nerves. Restricting anesthesia to the operative field aligns well with the continued expansion of ambulatory hand surgery and enhanced recovery pathways, as wide-awake anesthesia facilitates the intraoperative assessment of mobility and enables any necessary movement during the procedure (1).
The increasing use of ultrasound guidance has transformed the practice of distal peripheral nerve blockade by improving procedural accuracy and allowing smaller volumes of local anesthetic to be deposited more accurately around individual nerves. This precision improves the localization of anesthesia to sensory fibers and helps avoid motor fibers. Consequently, patients typically retain movement of the shoulder, elbow, and much of the forearm, facilitating safer postoperative mobility and permitting immediate assessment of tendon repairs or neurologic function when clinically indicated (2).
The selection of nerves for blockade is dictated by surgical need rather than a single standardized technique. Procedures involving the volar thumb and radial digits generally require median nerve anesthesia, whereas operations affecting the little finger or ulnar border of the hand are more appropriately managed with an ulnar nerve block. Surgery on the dorsolateral aspect of the hand may only require blockade of the superficial radial nerve. When broader sensory coverage is necessary, these individual blocks can be combined to provide reliable anesthesia while minimizing unnecessary blockade of uninvolved nerves. This procedure-specific approach has expanded the versatility of regional anesthesia for a wide range of hand operations (3).
The clinical value of these techniques extends beyond the operating room. Retention of upper extremity strength reduces the functional limitations commonly experienced after more proximal blocks and may improve patient confidence during the immediate postoperative period. Individuals who rely heavily on the operative limb for daily activities or who have preexisting neurologic impairment affecting the opposite extremity may derive particular benefit from this approach. Nevertheless, careful patient selection remains essential because extensive reconstructive procedures, prolonged operations, or surgery involving more proximal tissue planes may still require brachial plexus blockade or general anesthesia to provide optimal surgical conditions (3).
Successful implementation of motor-sparing nerve blocks in hand surgery depends on a thorough understanding of upper extremity anatomy, proficiency with ultrasound-guided regional anesthesia, and meticulous injection technique. Although complications such as vascular puncture, intraneural injection, and local anesthetic systemic toxicity remain potential risks, adherence to established safety principles has made these events uncommon in experienced practice. Current evidence supports selective distal nerve blocks as reliable alternatives for appropriately selected hand procedures, demonstrating effective analgesia with favorable functional recovery and low complication rates. As experience with ultrasound-guided regional anesthesia continues to expand, motor-sparing techniques are expected to assume an increasingly prominent role in hand surgery by providing procedure-specific anesthesia that complements modern ambulatory surgical care.
References
- Neal JM, Gerancher JC, Hebl JR, et al. Upper extremity regional anesthesia: essentials of our current understanding, 2008. Reg Anesth Pain Med. 2009;34(2):134-170. doi:10.1097/AAP.0b013e31819624eb
- Sites BD, Chan VW, Neal JM, et al. The American Society of Regional Anesthesia and Pain Medicine and the European Society of Regional Anaesthesia and Pain Therapy joint committee recommendations for education and training in ultrasound-guided regional anesthesia. Reg Anesth Pain Med. 2010;35(2 Suppl):S74-S80. doi:10.1097/AAP.0b013e3181d34ff5
- Kohan J, Cabanas C, Edalatpour A, Seitz A, Kuei MC, Gander BH. Upper Extremity Blocks for Hand Surgeons: A Literature Review of Regional Anaesthesia Techniques, Efficacy, and Safety. Plast Surg (Oakv). 2024;32(4):667-676. doi:10.1177/22925503231184260
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