A patient with the Guyon canal syndrome may show different patterns of ulnar nerve involvement depending on where the injury is occurring.
Parameters:
(1) sensory function
(2) intrinsic hand muscles supplied by the ulnar nerve (interosseous and lumbrical)
(3) hypothenar muscles
|
Sensory Function
|
Instrinsic Hand Muscles
|
Hypothenar Muscles
|
Type
|
|
impaired
|
impaired
|
impaired
|
1
|
|
normal
|
impaired
|
impaired
|
2
|
|
normal
|
impaired
|
normal
|
3
|
|
impaired
|
normal
|
normal
|
4
|
|
Type
|
Anatomic Location of Nerve Injury
|
|
1
|
proximal to Guyon canal
|
|
2
|
deep motor nerve branch immediately distal to bifurcation
|
|
3
|
deep motor nerve distal to hypothenar branches
|
|
4
|
superficial branch
|
