Ulnar nerve impingement along an anatomical space in the wrist called Guyon's canal is known as Guyon's canal syndrome, or ulnar tunnel syndrome.[9] Recognized causes of ulnar nerve impingement at this location include local trauma, fractures, ganglion cysts,[10] and classically avid cyclists who experience repetitive trauma against bicycle handlebars.[11] This form of ulnar neuropathy comprises two work-related syndromes: so-called "hypothenar hammer syndrome," seen in workers who repetitively use a hammer, and "occupational neuritis" due to hard, repetitive compression against a desk surface.[10]