Pediatric supracondylar humerus fracture with fascicular median nerve injury: The role of neuromuscular ultrasound in diagnosis and management – a case report

Abstract

Background

Supracondylar humerus fractures are the most common type of elbow fractures in children. Nerve injuries, primarily neuropraxia, are frequent complications and are often managed with a “wait-and-see” approach. Electroneuromyography (ENMG) is the standard method for evaluating peripheral nerve injuries, while ultrasound (US) is valuable for localizing lesions.

Objective

This case report aims to highlight the beneficial role of US in the follow-up and rehabilitation of nerve injuries following pediatric supracondylar humerus fractures.

Case presentation

A 4-year-old boy presented with a supracondylar humerus fracture that was treated with closed reduction and K-wire fixation. He exhibited weakness in the first two fingers of his left hand, difficulty grasping, and nail changes. Ultrasound revealed a median nerve lesion adjacent to the fracture site. ENMG indicated an acute severe axonal injury involving the branch innervating the flexor carpi radialis muscle. Following rehabilitation, there was improvement in hand grip strength, measured using a JAMAR hand dynamometer, and in health-related quality of life (QoL), assessed by the Pediatric Outcomes Data Collection Instrument (PODCI) score. Follow-up ENMG showed signs of mild reinnervation.

Conclusion

Pre-ENMG ultrasound provides crucial information regarding which nerve should be examined with a nerve conduction study and identifies the initial muscle to be evaluated during needle EMG. This aids in accurately localizing nerve damage and guiding effective treatment.