The hook of hamate bone.
Roof of tunnel of guyon.
By cutting the ligament pressure is taken off the ulnar nerve.
The needle is then withdrawn halfway and normal saline solution is injected.
The ligament that forms the roof of guyon s canal is cut to relieve the pressure on the ulnar nerve.
The volar portion roof of the canal is created by the volar carpal ligament also known as the palmar carpal ligament.
The skin is then sewn back together.
Care is taken to make sure that the ulnar nerve is out of the way and protected.
This hydrodissection creates a space just superficial to the ligamentous roof of the guyon ca nal 15 blanching of the overlying skin can be observed fig 2.
Once in view this ligament is released using a scalpel or scissors.
Floor is formed by the flexor retinaculum extending transversely across carpal bones and roof is formed by the pisohamate ligament ligament attaching pisiform to hook of hamate.
Jean casimir félix guyon.
Guyon s canal is a unique location where ulnar nerve is vulnerable to compressive injury although the more common location of the ulnar nerve injury occurs at the elbow which is known as cubital tunnel syndrome.
Once the ligament is cut the pressure on the nerve is relieved.
Creation of working space three millimeter skin incisions are made at the portal sites.
Between the pisiform and the hook of the hamate is a depression known as the tunnel of guyon.
There have been trials with gloves which help protect the ulnar nerve from compression.
Guyon s canal left hand from the palmar side yellow.
The ulnar nerve and its sensory and motor branch.
Mentous roof of the guyon canal.
Volar carpal ligament the roof.
This ligament forms the roof over the top of guyon s canal.
Because the tunnel of guyon encloses the ulnar.
The ulnar canal or ulnar tunnel also known as guyon s canal or tunnel is a semi rigid longitudinal canal in the wrist that allows passage of the ulnar artery and ulnar nerve into the hand.
The roof of the canal is made up of the superficial palmar carpal ligament while the deeper flexor retinaculum and hypothenar muscles comprise the floor.
It is formed by the following structures.
The anatomic boundaries of guyon s canal include.
The ligament heals by forming scar tissue.
Figure 1 volar wrist anatomy of floor and roof of guyon canal.
