Guyon’s Canal Syndrome

Anatomy and Function of the Ulnar Nerve

The ulnar nerve is one of the three major nerves supplying the hand. It originates in the neck and travels down the arm, passing around the medial epicondyle, a bony prominence on the inner side of the elbow.

From there, it runs beneath the forearm muscles and enters the hand along the palm side near the little finger. The ulnar nerve is responsible for both movement and sensation in specific parts of the hand.

Symptoms

Compression of the ulnar nerve can affect the hand, wrist, and little finger. Symptoms include:

• Pain
• Weakness
• Tingling
• Numbness
• Difficulty grasping or holding objects

Causes or Risk Factors

Common causes or risk factors for ulnar nerve compression may include:

• Use of vibrating tools
• Joint arthritis
• Ganglion cysts
• Acute or repetitive trauma
• Tumors
• Blood clots
• Fracture of the hamate bone (one of the small bones near the wrist)
• Synovitis (inflammation of synovial membrane)

Diagnosis

Your doctor will evaluate your symptoms, review your medical history, and perform a physical examination. Imaging studies such as X-rays, MRI, or CT scans may be ordered to help identify underlying causes.

Additional tests, such as Doppler ultrasound, may be used to assess blood flow in the ulnar artery. The diagnosis is confirmed with a nerve conduction velocity test, a specialized study that measures how quickly electrical signals travel through the nerve.

Treatment

Treatment for Guyon’s canal syndrome typically begins with non-surgical approaches. These may include:

• Home remedies
• Using padded tools
• Applying ice packs
• Avoiding activities that aggravate pain
• Immobilization with a brace or splint
• Prescription pain medications
• Massage therapy
• Physical therapy
• Steroid injections

Surgery is only recommended where conservative treatment options fail to deliver the desired results to relieve pressure on the ulnar nerve.

Ulnar Nerve Decompression

This surgery involves the following steps:

• IV sedation is administered to help you relax, and local anesthesia may be used to numb the wrist.
• A small incision is made along the ulnar nerve in your palm region.
• Your surgeon may remove a ganglion cyst, repair a fracture, or release certain ligaments to reduce pressure on the ulnar nerve.
• The incision is then closed and covered with a dressing.

Recovery After Surgery

Pain is typically managed with a combination of non-steroidal anti-inflammatory drugs (NSAIDs) and opioids. The wrist is supported with a splint or cast, and you will be advised to keep your arm elevated above heart level to reduce swelling.

Physical therapy is usually recommended, with guided exercises to improve flexibility and restore range of motion.