A patient may develop the Guyon Canal Syndrome of the distal ulnar nerve if certain conditions are present at the wrist.
Synonym: pisohamate tunnel syndrome
|
Feature of Canal
|
Anatomic Feature
|
|
beginning
|
proximal edge of the volar carpal ligaments
|
|
roof
|
palmar carpal ligament, palmaris brevis muscle, origins of the hypothenar muscles
|
|
floor
|
tendons of the flexor digitorum profundus, transverse carpal ligament, pisohamate ligament, pisometacarpal ligament
|
|
medial border
|
pisiform bone, tendon of the flexor carpi ulnaris
|
|
lateral wall
|
tendons of the extrinsic flexors, transverse carpal ligament, hook of the hamate bone
|
|
end
|
fibrous arch of the hypothenar muscles
|
Possible causes of the Guyon canal syndrome:
(1) ganglion or other cyst at the wrist
(2) aneurysm of the ulnar artery
(3) lipoma or other soft tissue tumor at the wrist
(4) anomaly of a muscle or tendon at the wrist
(5) fracture
(5a) distal radius and/or ulna
(5b) pisiform bone
(5c) hook of the hamate
(5d) other wrist bones along the hypothenar aspect
(6) chronic repetitive trauma (bicycling, manufacturing, etc)
