Prof. Dr. Mehmet Şenoğlu — Brain, Nerve and Spine Surgery
Do you feel numbness in your little and ring fingers after a long phone call, wake up toward morning with numb fingers, or find yourself increasingly struggling with delicate tasks in your hand? Behind these complaints there often lies nerve compression at the elbow — known medically as cubital tunnel syndrome. This insidiously progressing condition can be brought under control with simple measures when noticed early, but if neglected it can lead to permanent muscle weakness. In this article, we explain in plain language what nerve compression at the elbow is, along with its symptoms, causes, and treatment options.
What Is Nerve Compression at the Elbow?
Nerve compression at the elbow is a condition in which the ulnar nerve in our arm becomes compressed or irritated at the level of the elbow. After carpal tunnel syndrome at the wrist, it is the second most common nerve compression (entrapment neuropathy).
It is fundamentally a “narrow passage” problem. The ulnar nerve, one of the main nerves of our body, begins at the neck, descends toward the arm, and passes through a narrow tunnel located just behind the bony prominence on the inner side of the elbow (the medial epicondyle). This tunnel is called the cubital tunnel; its floor and walls are formed by bones, and its roof by a firm band of connective tissue. When pressure develops on the nerve in this narrow passage, cubital tunnel syndrome arises.
Where Does the Ulnar Nerve Pass?
When you place your hand on the bony prominence on the inner side of your elbow, you can often feel the ulnar nerve passing there with your fingertips. The “electric shock” sensation we feel when we bump this area colloquially also comes from this nerve. The ulnar nerve is responsible for sensation in the little (5th) and ring (4th) fingers of the hand and for the functioning of some of the small muscles within the hand. For this reason, the symptoms of compression are limited precisely to this region; they do not affect the thumb and index finger.
What Are the Symptoms of Nerve Compression at the Elbow?
Cubital tunnel syndrome generally does not begin loudly; on the contrary, it progresses insidiously and slowly. Patients often do not remember exactly when the complaints began. The main symptoms are:
- Numbness and tingling in the little and ring fingers: This is the most typical symptom. It may also be felt on the inner part of the hand.
- Pain on the inner surface of the elbow: Often accompanied by pain and numbness radiating to the fingers.
- Symptoms increasing when the elbow is bent: Complaints become more pronounced while talking on the phone, driving, or reading a book.
- Numbness that increases at night: The elbow remaining bent during sleep puts more pressure on the nerve; for this reason, numbness increases at night and often eases when the hand is shaken.
- Reduced hand dexterity and weakness: In advanced cases, buttoning, combing hair, using a keyboard, or holding objects becomes difficult.
- Muscle wasting (atrophy): If the process continues for a long time, loss of strength and thinning can develop in the hand and forearm muscles.
While symptoms are intermittent in the early stages, they can become constant over time. For this reason, evaluation in the early period is important.
What Causes Nerve Compression at the Elbow?
At the root of the compression lies the development of pressure or stretching in the narrow tunnel through which the nerve passes. The main factors that facilitate this are:
- The elbow remaining bent for long periods: This is the most common cause. Sleeping on the arm or keeping the elbow bent all day strains the nerve.
- Leaning on the elbow and pressure on the elbow: Using a laptop on your lap, resting the elbow on a desk or a car window creates pressure. Especially in summer, with short-sleeved clothing, the direct contact of the elbow with hard surfaces increases this risk.
- Repetitive elbow movements: Repetitive tasks such as keyboard use, playing the guitar, or painting are risky.
- Elbow trauma, fracture, or dislocation: Past injuries and healing periods can pave the way for nerve compression.
- Conditions that cause swelling in the elbow: Calcification and rheumatic diseases can lead to narrowing of the tunnel.
- Anatomical features: In some people, the nerve slips out of the tunnel and returns when the elbow is bent; over time, this wears down the nerve.
- Systemic diseases such as diabetes can make nerves more prone to compression.
For this reason, the risk is higher in desk workers, frequent phone users, and drivers who hold their arm against the window.
How Is Nerve Compression at the Elbow Diagnosed?
Diagnosis begins with a detailed history and a physical examination. There are two tests commonly used in the examination:
- Tinel’s sign: When the ulnar nerve at the elbow is lightly tapped with a finger, an electric-shock sensation radiating to the little and ring fingers occurs.
- Elbow flexion test: Keeping the wrist straight, the elbow is bent as far as possible and held in that position for a while; during this, numbness or tingling appears in the 4th and 5th fingers.
The most valuable method for clarifying the diagnosis and measuring the degree of nerve damage is EMG (electromyography / nerve conduction study). This examination shows where and how much the nerve is compressed. Imaging such as X-ray, and MRI when necessary, may also be requested to evaluate the elbow. In addition, conditions that can cause similar complaints, such as a cervical disc herniation (C8-T1 nerve root compression), must also be distinguished.
The Difference Between Cubital Tunnel Syndrome and Carpal Tunnel Syndrome
These two conditions are often confused, but the location of the compression and the fingers affected are different. Cubital tunnel syndrome is compression of the ulnar nerve at the elbow, and symptoms appear in the little and ring fingers. Carpal tunnel syndrome, on the other hand, is compression of the median nerve at the wrist, and symptoms are felt in the thumb, index, and middle fingers. This distinction is important for correct diagnosis and treatment.
Treatment of Nerve Compression at the Elbow
The most important first step of treatment is to eliminate the factor causing the compression. The approach is determined according to the stage of the condition and, in particular, whether or not muscle loss is present.
Non-Surgical (Conservative) Treatment
In early and mild cases where there is no muscle loss, non-surgical methods are applied first:
- Behavior and position adjustment: Avoiding keeping the elbow bent for long periods, sleeping on the arm, and movements that put pressure on the elbow.
- Night splint: A splint that keeps the elbow in a straight position during sleep reduces the load on the nerve and eases nighttime complaints.
- Medication: Anti-inflammatory painkillers (NSAIDs) deemed appropriate by the doctor reduce pain and irritation.
- Physical therapy and exercise: Nerve gliding exercises, manual therapy, and appropriate physical therapy methods help relieve the nerve.
Surgical Treatment
Surgery comes into consideration in patients who do not respond to conservative treatment, who have developed marked muscle weakness or muscle wasting, and whose complaints have become unbearable. In this case, surgery is necessary to prevent the progression of neurological damage. The main goal in surgery is to release the ulnar nerve and relieve the pressure on it; this can be done by widening the tunnel or by moving the nerve to the front of the elbow (transposition). A very good response is generally obtained from surgery. After the operation, exercises that preserve muscle strength and joint mobility are recommended under the guidance of a physiotherapist.
Why Is Early Diagnosis Important?
In cubital tunnel syndrome, time is valuable. While in cases diagnosed early, simple measures and physical therapy are often sufficient, in cases neglected for a long time the nerve damage can become permanent, and the muscle wasting that develops may not always reverse. For this reason, it is of great importance to consult a doctor when persistent numbness in the little and ring fingers, weakness in the hand, or loss of dexterity is noticed.
Frequently Asked Questions
Below, we have gathered the most frequently asked questions about nerve compression at the elbow along with brief answers. These answers are for general information; the information that applies to your specific situation is the one given by your doctor.
What causes nerve compression at the elbow?
The most common causes are the elbow remaining bent for long periods and pressure on the elbow. Sleeping on the arm, resting the elbow on hard surfaces, repetitive elbow movements, past elbow trauma, conditions that cause swelling such as calcification, and diseases such as diabetes pave the way for this compression.
What are the symptoms of nerve compression at the elbow?
The most typical symptom is numbness and tingling in the little and ring fingers. This may be accompanied by pain on the inner surface of the elbow. Complaints increase when the elbow is bent and at night; in advanced cases, weakness in the hand, loss of dexterity, and muscle wasting can be seen.
Does nerve compression at the elbow go away on its own?
In early and mild cases, complaints can largely subside with correction of the behaviors causing the compression, a night splint, and appropriate treatment. However, complete spontaneous recovery cannot always be expected; since damage can become permanent in cases neglected for a long time, it is important to consult a doctor.
Why does it increase at night while sleeping, and how can I ease it?
During sleep, the elbow remains bent for a long time without one being aware of it, and this puts more pressure on the ulnar nerve, increasing nighttime numbness. With your doctor’s recommendation, using a splint that keeps the elbow straight at night can help ease this complaint.
How is surgery for nerve compression at the elbow performed?
In surgery, the compressed ulnar nerve is released; this can be done by widening the tunnel through which the nerve passes or by moving the nerve to the front of the elbow. The goal is to relieve the pressure on the nerve, and a very good result is generally obtained.
Which doctor should I see for nerve compression at the elbow?
For your complaints, you can consult specialists in brain and nerve surgery, orthopedics, neurology, or physical therapy and rehabilitation. For a correct diagnosis, an EMG examination is generally performed in addition to the physical examination.
Is it the same thing as carpal tunnel syndrome?
No. Carpal tunnel syndrome is compression of the median nerve at the wrist and affects the thumb, index, and middle fingers. Nerve compression at the elbow (cubital tunnel syndrome), on the other hand, involves the ulnar nerve and produces symptoms in the little and ring fingers.
What happens if it is not treated?
If the compression continues for a long time, the nerve can be permanently damaged; irreversible loss of strength and thinning (atrophy) can develop in the hand and forearm muscles. For this reason, it is important to have it evaluated before the symptoms progress.
Disclaimer (Legal Notice)
The information contained in this article has been prepared for general informational purposes only and in no way replaces a medical examination, diagnosis, or treatment. The course of nerve compression at the elbow and its appropriate treatment vary according to the degree and duration of the compression and the patient’s general state of health, and can only be determined by a doctor who evaluates you. If you have a complaint or before making any decision regarding your health, always consult a specialist physician.