What is ulnar nerve entrapment?

The most common issue with the ulnar nerve is entrapment, which occurs when something increases the pressure on the ulnar nerve in the elbow or wrist. Nerve entrapment is a form of nerve compression syndrome.

Compression (a pinched nerve) may cause inflammation, which is responsible for nerve (neuropathic) pain and neuropathy (nerve damage). Sometimes, it affects your strength of grip, so you won't be able to wrap things around.

It is a nerve on the medial aspect.

Your ulnar nerve is just one of the nerves in the peripheral nervous system network, which carries information back and forth to your brain via your spinal cord.

Your ulnar nerve lets you bend and straighten your little and ring fingers to grasp objects. The nerve also carries sensations of touching, pain, and temperature. A lump on the back of your elbow may make you feel a tingling sensation known as a "funny bone" because it compresses your ulnar nerve. Everyone has two ulnar nerves-one in each arm.

What are the types of ulnar nerve entrapment?

This nerve can get entrapped at either your elbow or your wrist. It includes:

• Cubital tunnel syndrome: Compression or traction and stretching of your ulnar nerve on the inside of your elbow.
• Guyon's canal syndrome: Compression of your ulnar nerve along your forearm in the wrist area.

How common is ulnar nerve entrapment?

This is the second most joint peripheral neuropathy that affects your arms. The commonest is carpal tunnel syndrome. It is a pinched median nerve that lies in your wrist. Guyon's canal syndrome is quite rare.

What are the symptoms of ulnar nerve entrapment and injury?

Symptoms appear progressively and may occur and then disappear. Symptoms may worsen during the nighttime or when you participate in activities that stretch or stress your elbow and/or wrist.

Symptoms and signs of ulnar nerve entrapment and injury include:

• Curving of pinky and ring fingers (like a claw).
• Pain in your elbow (cubital tunnel syndrome) or wrist (Guyon's canal syndrome).
• Your ring and pinky fingers feel numb and tingly.
• Weakness in your hand that makes it hard to grasp something, reach for and pick up things, or perform activities such as writing or buttoning a shirt.
• Inability of some muscles in your ring or pinky finger (a sign that occurs in less than 1 percent of cases).

What is the cause of ulnar nerve entrapment?

Any activities that stretch your ulnar nerve at your elbow or bend your elbow to extreme degrees can lead to cubital tunnel syndrome. Lying in bed or getting out of a bed/ resting position with bent elbows can cause symptoms of ulnar nerve entrapment.

Ganglion cysts are benign fluid-filled swellings that develop near your wrist joint. These cysts account for up to 40% of Guyon's canal syndrome cases. Another 45% of Guyon's canal syndrome diagnoses are idiopathic. Less commonly, cysts may also cause compression of the ulnar nerve within your elbow.

Other causes of ulnar nerve entrapment and compression include:

• Injuries and trauma.
• Arthritis.
• Fractures and bone spurs.
• Complications of surgeries for carpal tunnel or shoulder fractures.
• Diabetes.
• Elbow dislocation.
• Pressure from casts or splints or using crutches.
• Cysts or tumors.

What are the risks for ulnar nerve entrapment?

Ulnar nerve entrapment is much more common in men than in women. People whose jobs or hobbies involve more significant pressure or stretching on the elbow or wrist are at the highest risk, including:

• Baseball players, golfers, and tennis players.
• Cyclists.
• Construction workers.
• Smokers.
• Typists, writers, and others who repeatedly use a keyboard.
• Weightlifters.

What physical exam tests can help diagnose ulnar nerve entrapment?

Your healthcare provider performs various tests during your physical exam to diagnose your condition. You probably think these tests are minor and almost not worth the time. However, they help your health provider compare the strength of your fingers and hands. They include:

• Froment's test: When you hold a piece of paper between your thumb and index finger, your healthcare provider notices. The inability to flex your thumb at the interphalangeal joint at the tip could indicate something is wrong with your nerve.
• Tinel's test: The doctor taps on your funny bone at the elbow (ulnar nerve). Severe shock-like symptoms in your pinky and/or ring finger may be indicative of a nerve problem.
• Wartenberg's sign: The doctor watches as you spread the fingers apart and then closes them again, placing your hand on a flat surface. You probably have a nerve problem if you can't curve your pinky inward to touch the other fingers.

What are diagnostic tests for ulnar nerve entrapment?

These tests can confirm the presence of ulnar nerve entrapment:

• EMG, including nerve conduction studies, determines how well signals along nerves travel to stimulate muscles.
• MRI, neuromuscular ultrasound or X-rays can also reveal signs of nerve compression and rule out other conditions such as arthritis, ligament injuries and fractures.

What are the non-surgical treatments for ulnar nerve entrapment?

Non-surgical treatments for ulnar nerve entrapment include the following:

• Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce nerve (neuropathic) pain and swelling.
• Physical and occupational therapy can help you become more flexible and learn new ways to perform various activities that put less pressure on your ulnar nerve. For instance, you may learn nerve-gliding exercises that facilitate the gliding of your ulnar nerve within the ulnar tunnels.
• Splints or braces to stabilize your wrist or elbow.

What are the surgical treatments for ulnar nerve entrapment?

If non-surgical treatments aren't effective, surgery may be necessary. Surgery may be used to restore your ulnar nerve in the following ways based on the cause of the entrapment at the point of nerve compression:

• "Release" your compressed ulnar nerve, where it's compressed.
• Remove tumors or cysts.
• Transfer your ulnar nerve in front of the bony elbow joint.

How do I prevent ulnar nerve entrapment?

These measures may decrease your likelihood of getting ulnar nerve entrapment or reduce the severity of symptoms:

• If you're working on something that keeps your elbows bent for a long period, stretch out and stretch your arms.
• Avoid resting your elbows on an office chair or desk when typing or working on the computer.
• Tie a towel around your straightened arm at night so you cannot sleep on a bent elbow. Or you can wear an elbow brace backward on the elbow joint.

What are the complications of ulnar nerve entrapment?

Severe ulnar nerve entrapment in your elbow or wrist can result in muscle wasting in your hand. Sometimes, this loss is irreversible, so you must consult your medical provider when you realize you are experiencing symptoms.

What is the prognosis for patients with ulnar nerve entrapments?

About half of all patients with an ulnar nerve entrapment have improvement with non-surgical treatments.

Surgery may relieve nerve pain and other symptoms if necessary. Nonetheless, for most people suffering from cubital tunnel syndrome, symptoms can recur if surgery does not fully address the root cause of the problem. There is also the risk that your median nerve, ulnar artery, or ligaments in your elbow or wrist can suffer surgical damage.

Living With

When should I call my doctor?

You should call your healthcare provider if you have:

• Inability to pick up objects or the inability to drop objects.
• Elbow or wrist pain.
• Numbness and tingling in the hand or fingers.
• There are recurring problems accomplishing different kinds of daily activities, such as getting dressed up by using a button shirt or not being able to hold the pen.

To seek an expert consultation for any orthopedic condition.

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