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Radial nerve pressure
Pressure on the radial nerve (rare)
* A minor subluxation of the scaphoid bone can cause pressure on the radial nerve in the anatomical snuff-box, resulting in limited wrist extension with paraesthesia at the dorsum of the 3 ½ radial fingers. The treatment is manipulation.
* An osteoma at the dorsum of the base of the third metacarpal bone can cause pressure on the branch of the radial nerve to the index and middle fingers. Moving the hand from side to side with the wrist flexed causes a sharp twinge and a few minutes paraesthesia at the dorsum of index and middle fingers. Surgery might be needed.
* Friction of the sensory branch of the radial nerve against the lower edge of the radius can cause paraesthesia. Paraesthesia is provoked by maximal stretching of the nerve : bringing the dependant straight arm backwards, twisting it into full medial rotation, then pronating the forearm with bent wrist and fingers. Triamcinolone is used.
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