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Pronator teres reflex: reliability and normal value

D Shehab¹, D Butinar

¹Department of Medicine, Faculty of Medicine, Kuwait University, Safat.

American Journal of Physical Medicine & Rehabilitation

|September 1, 1996

Summary

The pronator reflex, used to assess cervical nerve roots C-6 and C-7, was reliably reproduced in healthy individuals. This study establishes normative latency data for the pronator teres reflex, aiding future clinical evaluations.

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Area of Science:

Neurology
Electrophysiology
Human Physiology

Background:

The pronator reflex is a clinical and electrophysiological tool for evaluating cervical nerve roots C-6 and C-7.
This reflex is understood to result from stretching the pronator teres muscle.

Purpose of the Study:

To electrophysiologically establish the reproducibility and reliability of the pronator reflex using surface electromyography.
To determine the 95% confidence interval (C.I.) for reflex latency in males and females.
To correlate pronator reflex latency with arm length.

Main Methods:

Surface electromyography was used to record the pronator reflex in 25 healthy individuals.
The pronator teres reflex was elicited by tapping the distal radius with the forearm in a neutral position and elbow flexed at 90 degrees.

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Forearm pronation was the observed response.

Main Results:

A reproducible diphasic response was observed in all participants.
Mean latency was 15.9 ms (95% C.I. 16.8) for females and 17.4 ms (95% C.I. 18.7) for males.
Data were collected for future evaluation of C-6, C-7 radiculopathy.

Conclusions:

The pronator reflex is a reliable and reproducible electrophysiological test.
Normative latency data and confidence intervals were established for healthy individuals.
This study provides a basis for using the pronator reflex in diagnosing C-6, C-7 radiculopathy.