Ulnar Nerve Neuropathy at the Elbow: Symptoms and Treatment

Ulnar nerve neuropathy at the elbow

Ulnar nerve neuropathy at the elbow, also known as cubital tunnel syndrome, is the second most common compressive neuropathy of the upper limb after carpal tunnel syndrome. The ulnar nerve, as it passes through the epitrochleo-olecranon groove of the elbow, is particularly vulnerable to compression, traction, and friction, causing tingling, numbness, and weakness in the hand. It is estimated that this condition affects approximately 25 people per 100,000 annually.

Anatomy of the Ulnar Nerve at the Elbow

The ulnar nerve at the elbow is a peripheral nerve passing through the cubital tunnel behind the medial epicondyle, susceptible to compression causing pain, numbness, and weakness in the forearm and hand. The ulnar nerve originates from the medial cord of the brachial plexus (C8-T1 roots) and runs along the arm medial to the brachial artery. At the elbow, the nerve passes through the cubital tunnel, an anatomical space delimited by:

• Floor: capsule of the humeroulnar joint and medial collateral ligament
• Roof: Osborne’s arcuate ligament (cubital tunnel retinaculum) and fascia of the flexor carpi ulnaris muscle
• Walls: medial epicondyle (epitrochlea) medially, olecranon laterally

The cubital tunnel is a critical point because:

• The space available for the nerve decreases by 55% with elbow flexion beyond 90°
• The nerve is superficially located, with poor soft tissue protection
• Intraneural pressure increases up to 6 times during full flexion

After the elbow, the ulnar nerve passes between the two heads of the flexor carpi ulnaris muscle and continues along the forearm to the hand, where it innervates the intrinsic muscles and provides sensation to the fourth and fifth fingers.

Causes and Risk Factors

Direct compression

• Prolonged resting of the elbow on hard surfaces (desk, armrest)
• Sustained positions with the elbow flexed during sleep
• Ganglion cysts, osteophytes, or scar tissue in the cubital tunnel
• Anatomical anomalies: anconeus epitrochlearis muscle (present in 10-25% of the population)

Traction and subluxation

• Elbow valgus deformity (increased carrying angle)
• Ulnar nerve subluxation: the nerve slides over the epicondyle during flexion, causing repeated friction (present in 16% of the population)
• Congenital ligamentous laxity

Occupational and sports factors

• Jobs requiring prolonged elbow flexion (phone calls, computer use)
• Sports with repetitive throwing movements (baseball, javelin)
• Activities with vibrations transmitted to the upper limb
• Prolonged use of crutches

Post-traumatic causes

• Elbow fractures (epicondyle, olecranon) with callus formation
• Elbow dislocations
• Surgical outcomes at the elbow with scar fibrosis

Predisposing medical conditions

Symptoms

Sensory symptoms (earlier)

• Tingling and numbness in the fourth and fifth fingers (little and ring finger, ulnar side)
• Sensation of an “electric shock” radiating from inside the elbow to the hand
• Paresthesias that worsen with the elbow flexed (talking on the phone, sleeping, driving)
• Decreased tactile sensitivity in the ulnar area of the hand

Motor symptoms (later)

• Weakness of grip: difficulty opening jars, squeezing objects
• Reduced precision grip: difficulty handling small objects, buttons, coins
• Wartenberg’s sign: the little finger tends to remain abducted (away from the other fingers)
• Froment’s sign: to hold a sheet of paper between the thumb and index finger, the patient compensates by flexing the distal phalanx of the thumb
• Atrophy of the intrinsic hand muscles (in advanced cases)
• Claw hand (griffe deformity): hyperextension of the metacarpophalangeal joints and flexion of the interphalangeal joints of the fourth and fifth fingers

Severity classification (modified McGowan)

Diagnosis

Clinical examination

The doctor or physical therapist performs a series of specific tests:

• Tinel’s test at the elbow: percussion of the nerve in the cubital groove — positive if it causes tingling in the fourth and fifth fingers
• Elbow flexion test: maintain the elbow flexed at 120° for 60 seconds — positive if it reproduces symptoms
• Ulnar nerve compression test: direct pressure in the cubital groove for 30-60 seconds
• Sensory evaluation: monofilament test and two-point discrimination
• Muscle strength: testing of interosseous muscles, adductor pollicis, flexor carpi ulnaris
• Froment’s and Wartenberg’s sign

Electromyography and electroneurography (EMG/ENG)

Electrophysiological examination is the diagnostic gold standard:

• Motor nerve conduction velocity: reduction across the elbow (< 50 m/s)
• Distal motor latency: increased
• Denervation potentials: present in ulnar muscles in moderate-severe cases
• Allows localization of the exact site of compression and quantification of severity

Instrumental examinations

• Nerve ultrasound: evaluates the cross-sectional area of the nerve (increased in compression), identifies subluxation
• Elbow MRI: highlights structural causes of compression (cysts, osteophytes, mass)
• X-ray: shows bone alterations, osteoarthritis, fracture outcomes

Conservative Treatment

Conservative treatment is indicated in mild and moderate forms, with a success rate of 50-70% in mild cases.

Behavioral modifications

• Avoid prolonged elbow flexion: do not sleep with the elbow bent, do not rest it on the desk
• Avoid direct pressure on the cubital groove
• Modify ergonomics: position the keyboard and mouse so that the elbow is flexed less than 90°
• Phone calls: use a headset or speakerphone instead of holding the phone to the ear

Night splint

A brace or splint that keeps the elbow in extension (or maximum flexion of 30-45°) during the night is often the first therapeutic measure. It reduces pressure on the nerve during sleep, when one unconsciously tends to sleep with the elbows very flexed.

A simple alternative is to wrap a towel around the elbow to limit flexion.

Medications

• Oral or topical NSAIDs to reduce local inflammation
• Vitamin B6 and B12: support for nerve metabolism (on medical advice)
• Gabapentin or pregabalin: for neuropathic pain in more symptomatic cases

Physiotherapy and Rehabilitation

Phase 1 — Neuroprotection and symptom reduction (weeks 1-4)

Patient education:

• Explanation of compression mechanisms
• Instructions on positions to avoid
• Correct ergonomics at work and during sleep

Neurodynamic techniques (nerve gliding):
Ulnar nerve gliding exercises improve nerve mobility within the cubital tunnel, reducing adhesion and friction:

• Exercise 1: seated, arm by your side. Flex the wrist upwards, then progressively extend the elbow while keeping the wrist flexed. 10 repetitions, 3 sets
• Exercise 2: seated, elbow flexed at 90°. Slowly rotate the forearm into supination and pronation. 10 repetitions, 3 sets
• Exercise 3: standing, abduct the arm to 90° with the elbow extended, wrist flexed. Laterally tilt the head to the opposite side. Hold for 5 seconds, 5 repetitions

Manual therapy:

• Ulnar nerve mobilization in the cubital groove
• Myofascial techniques on the flexor carpi ulnaris and pronator muscles
• Mobilization of the humeroulnar joint

Phase 2 — Functional recovery (weeks 4-8)

Strengthening of intrinsic hand muscles:

• Exercises with elastic bands for finger abduction and adduction
• Pinch grip with therapeutic putty of different resistances
• “Table” exercise: keep fingers extended at the metacarpophalangeal joints and flexed at the interphalangeal joints
• Thumb opposition to fingers with elastic resistance

Strengthening of forearm muscles:

• Wrist flexion and extension with light dumbbell (0.5-1 kg)
• Pronation and supination with hammer or dumbbell
• Grip exercises with adjustable hand grip

Instrumental physical therapy:

• High-power laser therapy on the cubital tunnel region
• Pulsed therapeutic ultrasound
• TENS for neuropathic pain control

Phase 3 — Return to activities (weeks 8-12)

• Specific functional exercises for work or sports activities
• Progressive increase in loads
• Maintenance of neurodynamic exercises as prevention
• Clinical and possibly electrophysiological re-evaluation

Surgical Treatment

Surgery is indicated when:

• Conservative treatment for 3-6 months does not produce improvements
• Progressive motor deficit or muscle atrophy is present
• EMG shows signs of significant denervation
• Compression is due to structural causes (cysts, osteophytes)

Surgical techniques

In situ decompression:

• Release of Osborne’s ligament and compressive tissues without moving the nerve
• Less invasive procedure, indicated when there is no subluxation

Anterior transposition of the nerve:

• The nerve is moved in front of the epicondyle (subcutaneous, intra- or sub-muscular)
• Indicated in cases of subluxation or recurrent compression

Medial epicondylectomy:

• Partial removal of the epicondyle to enlarge the nerve space
• Less commonly used than other techniques

Post-surgical rehabilitation

• Weeks 1-2: brace in 60-90° flexion, finger and wrist movements
• Weeks 2-4: progressive elbow mobilization, neurodynamic exercises
• Weeks 4-8: progressive strengthening, full range of motion recovery
• Weeks 8-12: gradual return to activities
• Sensory recovery can take 3-6 months, motor recovery up to 12-18 months in severe cases

Recovery Times

Prevention

• Avoid resting the elbow on a desk or hard surfaces for prolonged periods
• Sleep with the elbow in extension (possibly with a night splint)
• Take frequent breaks during repetitive activities with the elbow flexed
• Ergonomically position your workstation
• Strengthen upper limb muscles to protect the nerve
• In case of initial symptoms, promptly consult a doctor for early treatment

Frequently Asked Questions (FAQ)

Frequently Asked Questions

Does cubital tunnel syndrome heal on its own?

Mild cases of ulnar nerve neuropathy may improve with behavioral modifications and conservative management. However, persistent or worsening symptoms often necessitate further intervention, including physical therapy or, in some instances, surgical treatment.

What is the difference between carpal tunnel and cubital tunnel?

Carpal tunnel syndrome involves compression of the median nerve at the wrist, affecting the thumb, index, middle, and part of the ring finger. Cubital tunnel syndrome, conversely, is the compression of the ulnar nerve at the elbow, primarily causing symptoms in the ring and little fingers.

When is surgery necessary for ulnar nerve neuropathy?

Surgical intervention for ulnar nerve neuropathy is typically considered when conservative treatments, such as behavioral modifications, splinting, and physical therapy, have not provided adequate relief. It may also be recommended in cases of severe nerve compression or progressive motor weakness.

What is the role of a physical therapist in managing ulnar nerve neuropathy?

A physical therapist plays a crucial role in managing ulnar nerve neuropathy by guiding patients through neuroprotection, symptom reduction, and functional recovery phases. They implement exercises and strategies to improve nerve gliding, reduce compression, and restore strength and mobility.

Sources and Scientific References

1. Poenaru D et al. (2022). Conservative therapy in ulnar neuropathy at the elbow (Review). Exp Ther Med. 24:517. DOI | PubMed
2. Caliandro P et al. (2016). Treatment for ulnar neuropathy at the elbow. Cochrane Database Syst Rev. 11:CD006839. DOI | PubMed
3. Coppieters MW et al. (2008). Do ‘sliders’ slide and ‘tensioners’ tension? An analysis of neurodynamic techniques and considerations regarding their application. Man Ther. 13:213-21. DOI | PubMed
4. Caliandro P et al. (2012). Treatment for ulnar neuropathy at the elbow. Cochrane Database Syst Rev.:CD006839. DOI | PubMed
5. Caliandro P et al. (2011). Treatment for ulnar neuropathy at the elbow. Cochrane Database Syst Rev.:CD006839. DOI | PubMed