Guyon’s Canal Syndrome
This is a condition whereby the ulnar nerve (nerve that supplies sensation to the little finger and half of ring finger plus small muscles of the hand) is compressed at the level of the wrist. It is characterised by numbness and tingling affecting the little and half of the ring fingers as well as weakness affecting the small muscles of the hand.
This can occur fairly acutely and has been seen in patients using crutches in a prolonged fashion and also in keen cyclists. In both cases it is probably related to direct pressure effects. In occasional cases the hand can become profoundly weak and wasted.
Nerve conduction studies are obtained to confirm the diagnosis, assess severity and exclude a double crush phenomenon where the same nerve is compressed in a second location along it’s path. If the condition is refractory to non-operative treatment then surgical decompression is offered.