Cubital tunnel syndrome
Content reviewed by✓Mr Andrew Davies, PhD FRCS (Tr & Orth)· Reviewed June 2026Cubital tunnel syndrome happens when one of the main nerves of the arm (the ulnar nerve) is squeezed or stretched as it passes the inner side of the elbow. It causes numbness and tingling in the ring and little fingers, and over time can weaken the small muscles of the hand. It is one of the most common trapped-nerve problems in the arm.
📊 After carpal tunnel syndrome in the wrist, cubital tunnel syndrome is the next most common trapped-nerve problem in the arm.
What is cubital tunnel syndrome?
Cubital tunnel syndrome is a condition where the ulnar nerve, one of the main nerves of the arm, is compressed or irritated as it passes around the inside of the elbow. This nerve is the one that causes the sharp pain you feel when you knock your "funny bone". When it is compressed over time, it causes tingling or numbness in the ring and little fingers, and in more severe cases, weakness of the grip.
The nerve runs through a narrow channel on the inner side of the elbow. This channel can become tight due to swelling, arthritis, previous injury, or simply the repeated bending of the elbow during daily activities. People who spend long periods with the elbow bent, such as talking on the phone, sleeping with bent arms, or working at a desk, are at higher risk.
Mild cases often improve with simple changes, avoiding prolonged elbow bending, using a night splint to keep the elbow straight while sleeping, and protecting the elbow from pressure. If symptoms are significant or not improving, a straightforward day-case operation to take the pressure off the nerve gives good results in most patients.
Common causes
- Keeping the elbow bent for long periods (sleeping with bent arms, holding a phone)
- Leaning the inner side of the elbow on a desk or hard surface
- A previous elbow fracture that has changed the shape of the joint
- Elbow arthritis with bony spurs near the nerve
- A nerve that slips or snaps over the bony bump on the inner elbow
Who is at risk? Jobs or habits that keep the elbow bent for long periods, or that press on the inner side of the elbow, increase the risk. People with less natural padding around the elbow can be more prone to it.
Symptoms
Symptoms vary depending on the severity and duration of the condition. Common symptoms include:
- Numbness and tingling in the little and ring fingers, worst at night and when the elbow is bent
- Aching pain along the inner side of the elbow and forearm
- Weakness of grip and pinch, particularly pinching between thumb and index finger
- Loss of muscle bulk in the hand, sometimes seen as a hollow between the thumb and index finger
- In advanced cases, the ring and little fingers may start to curl into a claw position
- Tingling that shoots into the fingers when the nerve at the inner elbow is tapped
When to seek help: See a specialist if symptoms are persistent, waking you at night, or causing weakness or loss of muscle bulk in the hand. Weakness and muscle wasting suggest the nerve is significantly squeezed, and surgery to relieve the pressure may help.
How is it diagnosed?
Your surgeon will take a detailed history and examine the joint. The following investigations may be arranged to confirm the diagnosis:
- Examination - tapping the nerve at the inner elbow, bending the elbow to see if it brings on symptoms, and checking the strength and feeling in the hand
- Nerve tests (nerve conduction studies) - confirm the diagnosis and show how mild or severe it is
- A muscle test (EMG) - checks whether the hand muscles have been affected and for how long
- X-ray - looks for bony spurs or changes from a previous injury
- Ultrasound - can show swelling of the nerve or whether it slips out of place
Nerve tests are usually done before surgery to confirm the diagnosis, show how severe it is, and rule out other causes. The results, alongside the examination, help decide whether surgery is needed.
Treatment pathway
Treatment is tailored to the severity of the condition, your age, activity level, and overall health. Most conditions are treated in a stepwise fashion, starting with the least invasive options.
Activity changes and a night splint
Avoiding keeping the elbow bent for long periods and protecting the inner elbow from pressure. A splint worn at night holds the elbow fairly straight, which eases night-time symptoms. This works well for mild cases.
Releasing the pressure on the nerve (decompression)
A small operation that divides the tight band of tissue, and anything else pressing on the nerve, leaving the nerve where it lies. It suits moderate cases without much muscle wasting, and recovery is usually quick.
Moving the nerve to the front of the elbow (transposition)
The nerve is moved from behind the bony bump to in front of it, where it is under less pressure and stretch. This is chosen when the nerve slips out of place, after previous elbow surgery, or when the channel is particularly narrow. Tucking the nerve under the muscle gives the most protection but takes a little longer to recover from.
Recovery
Numbness and tingling usually settle first after surgery. Strength takes longer to come back and may not fully recover if there is already a lot of muscle wasting, so having surgery sooner generally gives a better result for strength.
- Night splint: 3-6 months (non-surgical)
- Recovery after decompression: 4-8 weeks
- Recovery after moving the nerve: 6-12 weeks
- Nerve recovery after surgery: weeks to months
What results can I expect?
Mild cases often settle with simple measures. Surgery to relieve the pressure helps the large majority of people with moderate symptoms (around 85-90%). Advanced cases, where muscle wasting has already set in, have a less predictable result.
Cubital tunnel syndrome - nerve compression at the elbow
Common activity questions for this condition. Timelines are approximate, always follow the specific guidance given by your surgeon and physiotherapist.
| Activity | Typical timeline | Notes |
|---|---|---|
| Drive | Weeks 4–6 | When you have adequate elbow strength and grip. Avoid sustained elbow flexion while driving initially. |
| Return to desk work | Weeks 2–4 | Adjust workstation, elbow pad, phone headset, keyboard position to avoid prolonged flexion. |
| Manual work | Weeks 4–8 | When grip strength has returned sufficiently for your job demands. |
| Sport | Months 2–4 | When grip and elbow strength are adequate. Avoid sustained elbow bending initially. |
| Nerve recovery | Months 3–12 | Tingling improves first. Motor recovery (grip and hand strength) takes longer. Be patient. |
Common concerns during recovery, and whether they are expected.
Your questions, answered
Plain-English answers to the things people most often ask, drawn from real patient questions and grounded in published guidance. Tap a question to open it.
About thisWhat is cubital tunnel syndrome?
The ulnar nerve is squeezed where it passes the inner side of the elbow (the "funny bone"). This causes pins and needles or numbness in the little and ring fingers, and sometimes hand weakness. It is often worse when the elbow is bent for long periods, such as overnight or holding a phone.
Your choiceDo I need surgery?
Milder symptoms often improve with simple changes: avoiding leaning on the elbow, taking breaks from prolonged bending, and keeping the elbow straighter at night. Surgery to release or reposition the nerve is considered when symptoms persist or worsen, or if there is weakness or muscle wasting.
Self-careWhat helps day to day?
Avoid resting or leaning on the elbow, keep the elbow straighter where you can, and at night a soft splint or simply wrapping a towel loosely around the front of the elbow can stop it bending fully. Regular breaks from bent-elbow positions help too.
Getting backWill surgery cure it?
Surgery usually stops symptoms getting worse and often eases the tingling. Numbness and weakness that have been present for a long time may recover slowly or only partly, which is why it is worth seeking review if symptoms are progressing rather than waiting.
RecoveryHow long is recovery after surgery?
You can usually move the elbow fairly soon, with heavier use and full activity returning over several weeks. Nerve symptoms can keep improving gradually over months. Your team will guide any splinting and activity steps.
UrgentWhen should I seek help sooner?
New or worsening hand weakness, clumsiness with fine tasks, or wasting of the muscles between the fingers suggests the nerve needs prompt assessment.
WellbeingMy sleep is disturbed by tingling, is that common?
Yes, night-time symptoms are common because the elbow tends to bend during sleep. Night positioning or a splint often helps; mention persistent night symptoms to your team.
- Versus Arthritis: Elbow pain
- British Elbow & Shoulder Society: Exercises for elbow stiffness
- British Elbow & Shoulder Society: Patient information
These links are to UK clinical guidance and patient information from recognised organisations. This page is for general information and does not replace personalised advice from your own clinical team.
Preparing for surgery?
Read our step-by-step guide - what to expect before, during, and after your procedure.
How is it diagnosed?
- ✓Examination - tapping the nerve at the inner elbow, bending the elbow to see if it brings on symptoms, and checking the strength and feeling in the hand
- ✓Nerve tests (nerve conduction studies) - confirm the diagnosis and show how mild or severe it is
- ✓A muscle test (EMG) - checks whether the hand muscles have been affected and for how long
- ✓X-ray - looks for bony spurs or changes from a previous injury
- ✓Ultrasound - can show swelling of the nerve or whether it slips out of place
Recovery milestones
- ●Night splint: 3-6 months (non-surgical)
- ●Recovery after decompression: 4-8 weeks
- ●Recovery after moving the nerve: 6-12 weeks
- ●Nerve recovery after surgery: weeks to months