Radial neuropathy (or radial mononeuropathy) is a type of mononeuropathy which results from acute trauma to the radial nerve that extends the length of the arm.

It is known as transient paresthesia when sensation is temporarily abnormal.

Symptoms vary depending on the severity and location of the trauma; however, common symptoms include wrist drop (the inability to extend the wrist upward when the hand is palm down); numbness of the back of the hand and wrist; and inability to voluntarily straighten the fingers.

Improperly sitting in a chair for several hours such that the armrest compresses the underside of the forearm is another potential cause.

Radial neuropathy is not necessarily permanent. Peripheral nerve regeneration is an imperfect and slow process, and full restoration of ability may take months, years, or may never occur.

Source: http://en.wikipedia.org/wiki/Radial_neuropathy

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