C-6 Motor–Radial Wrist Extensors

Name of test



Wrist extension

What it tests



Extensor carpi radialis longus


Extensor carpi radialis brevis

How to do it



With the patient’s fingers flexed and the forearm pronated, extend the wrist. Push down on the knuckle of the index finger as the patient resists with radial wrist extensor activity.

The normal response



Grade 5 strength. The examiner is unable to break wrist extensor strenght.

What it means if not normal


Comments



The extensor carpi radialis longus and brevis are innevervated by the radial nerve (C6-C7).

The patient’s fingers are in flexed to eliminate wrist extension activity generated by the finger extensor muscles.

A C6 radiculopathy is the most common because the C5-C6 disk is the cervical disk most susceptible to herniation or degeneration.

Citations





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 Figures



Last Updated on June 27, 2024

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