What is handlebar palsey (Guyon's canal syndrome)?

Handlebar palsy (clinically referred to as Guyon’s canal syndrome) is a condition in which the ulnar nerve becomes trapped. Symptoms include a pins and needles feeling into the ring and little finger, sometimes leading to a loss of sensation and a decrease in function of the muscles inside the hand. This usually occurs in cyclists due to the constant pressure of the handlebars against the ulnar nerve of the outside of the hand.

(This answer provided for NATA by the Indiana University Athletic Training Education Program)

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