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Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies

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Optimal Radial Motor Nerve Conduction Study Using Ultrasound in Healthy Adults.

Jungho Yeo¹, Yuntae Kim¹, Sooa Kim¹

¹Department of Rehabilitation Medicine, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea.

Annals of Rehabilitation Medicine

|May 16, 2017

Summary

This study provides standardized reference values for radial motor nerve conduction studies (RmNCS) using ultrasonography. Optimal stimulation and recording sites were identified to improve diagnostic accuracy for radial nerve assessments.

Keywords:

Electromyography Radial nerve Ultrasonography

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Area of Science:

Neurophysiology
Medical Imaging
Clinical Electrophysiology

Background:

Radial motor nerve conduction study (RmNCS) is crucial for diagnosing peripheral nerve disorders.
Standardized reference values and optimal electrode placement are needed for accurate RmNCS interpretation.
Ultrasonography (US) can aid in identifying optimal nerve conduction study sites.

Purpose of the Study:

To establish reference values for RmNCS.
To determine optimal stimulation and recording sites for RmNCS using US.
To analyze correlations between RmNCS parameters, demographics, and US findings.

Main Methods:

55 volunteers underwent RmNCS with US guidance.
Optimal stimulation site identified as the lateral edge of the spiral groove (A).
Optimal recording site identified as the largest cross-sectional area (CSA) of the extensor indicis proprius (EIP) muscle (B).
Spiral groove ratio and EIP ratio were calculated using surface distances and limb lengths.

Main Results:

Reference values for amplitude (5.7±1.1 mV), latency (5.7±0.5 ms), and velocity (73.7±7.0 m/s) were obtained.
RmNCS parameters significantly correlated with height, weight, arm length, and EIP muscle CSA.
Standardized ratios (spiral groove: 0.338±0.03; EIP: 0.201±0.03) showed consistency across demographics.

Conclusions:

A standardized method for RmNCS using US was established.
Optimal recording site is 20% of forearm length from the ulnar styloid process.
Optimal stimulation site is 34% of humeral length from the lateral epicondyle.