Overview
Ulnar nerve injury encompasses traumatic and compressive neuropathies leading to sensory and motor deficits in the hand and forearm. Perioperative ulnar neuropathy is a notable complication often linked to improper arm positioning during anesthesia, potentially causing significant long-term disability 1.Diagnosis
Clinical Presentation: Tingling, numbness, weakness in the ulnar nerve distribution (little finger, medial hand) 1.
Electrophysiological Tests: Nerve conduction studies (NCS) and electromyography (EMG) to assess conduction block and axonal damage 13.
Imaging: X-rays or MRI may be useful in identifying fractures or anatomical entrapments 2.Management
Conservative Treatment: Rest, splinting, and avoidance of pressure on the nerve 1.
Physical Therapy: Gradual rehabilitation exercises to restore function 1.
Surgical Intervention: For entrapment or severe compression, surgical decompression may be necessary 2.
Pain Management: Analgesics for neuropathic pain, though specific drug classes/doses are not detailed in the abstracts 1.Special Populations
Pediatrics: Greenstick fractures can lead to ulnar nerve entrapment requiring prompt surgical intervention for recovery 2.
Elderly: Increased risk of complications; careful monitoring and positioning to prevent nerve injury during procedures 1.Key Recommendations
Optimize Arm Positioning During Anesthesia: Use neutral positions to minimize ulnar nerve compression (Evidence: Moderate 1).
Early Identification and Intervention: Prompt diagnosis and treatment of ulnar nerve entrapment, especially in pediatric fractures, to ensure recovery (Evidence: Strong 2).
Avoid Prolonged Pressure: Prevent prolonged pressure on the ulnar nerve to reduce risk of pressure palsy and prolonged conduction block (Evidence: Expert opinion 3).References
1 Prielipp RC, Morell RC, Butterworth J. Ulnar nerve injury and perioperative arm positioning. Anesthesiology clinics of North America 2002. link00009-3)
2 Prosser AJ, Hooper G. Entrapment of the ulnar nerve in a greenstick fracture of the ulna. Journal of hand surgery (Edinburgh, Scotland) 1986. link90262-7)
3 Harrison MJ. Pressure palsy of the ulnar nerve with prolonged conduction block. Journal of neurology, neurosurgery, and psychiatry 1976. link