Tunnel of Guyon Compression

The tunnel of guyon is a passageway in the wrist that the ulnar nerve passes through to reach the pinky and ring finger.  This is similar in mechanism to carpal tunnel syndrome but it affects a different nerve and thus a different part of the hand.  This is a common injury to bikers (where it is known as 'handlebars palsy') since they often lean their weight forward on their handlebars and put the force right on this tunnel. 

The best treatment for this problem is Active Release Technique.  A.R.T. is used to open up the tunnel of Guyon and remove any adhesions between the ulnar nerve and the structures that it passes through.  Also, to ensure that the problem is not being complicated by a compression of the ulnar nerve elsewhere outside the tunnel, the entire length of the ulnar nerve all the way up the forearm to the shoulder must be addressed.  Entrapment of the ulnar nerve anywhere along the length of it can lead to the sensation of a cubital tunnel syndrome.  The nerve passes through a lot of muscles and fascia on its descent through the arm and it can become trapped between these structures.