The width and depth of the carpal tunnel are 19.2 ± 1.7 and 8.3 ± 0.9 mm, respectively, and the width to depth ratio is 2.3 ± 0.2. The tilt angle is 14.8 ± 7.8°. The tilt angle changes significantly along the length of the carpal tunnel, rotating away from the radial aspect of the hand distally (mean range 8.2–16.2°, p < 0.001). To accommodate these variables the pressure pad for the median nerve at the Carpal Tunnel must be a minimum of 3 mm long, and have a tilt angle of 25-30 degrees.

Current modern gel gloves that are manufactured for injury prevention in cyclists fail to understand the true anatomy of this canal and the canal of Guyon and do not act properly as an extrinsic prophylactic agent.

Anatomy of Guyon’s Canal

Guyon Canal is about 4cm in length and housed by four borders. The roof consists of the volar carpal ligament. The floor is made of the transverse carpal ligament.

The radial border has the hook of the hamate, and the medial border is composed of the pisiform bone along with the pisohamate ligament.

Inside this canal runs the ulnar nerve and artery.

The ulnar nerve enters the canal as a mixed sensory and motor nerve. As it travels through it, the nerve splits into superficial sensory and deep motor branches.

Each part of the ulnar nerve which is affected within Guyon Canal region is represented by a particular zone and gives its unique constellation of symptoms.