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Cubital Tunnel Syndrome

Second most common peripheral nerve compression after carpal tunnel syndrome. The ulnar nerve is compressed or stretched in the cubital tunnel behind the medial epicondyle. Paresthesias in the 4th and 5th fingers, intrinsic hand muscle weakness. McGowan-Dellon classification in 3 grades.

Characteristics

Cubital tunnel syndrome is the second most common peripheral nerve compression syndrome after carpal tunnel syndrome [1]. It results from compression or stretching of the ulnar nerve in the cubital tunnel, an osteoligamentous channel located behind the medial epicondyle. The annual incidence is estimated at 25 per 100,000 inhabitants with male predominance (3:1). The ulnar nerve is particularly vulnerable at this level due to its superficial subcutaneous position and the morphological changes of the tunnel during elbow flexion (volume reduction of 55%, internal pressure increase from 7 to 14 mmHg).

Five potential compression sites have been identified: Struthers arcade, medial intermuscular septum, medial epicondyle (Osborne's ligament), Osborne's fascia between the two heads of the flexor carpi ulnaris (FCU), and the deep flexor-pronator aponeurosis [2]. The clinical presentation combines paresthesias of the 4th and 5th fingers (ulnar territory), intrinsic hand muscle weakness (interossei, hypothenar, adductor pollicis), and eventually amyotrophy of the first dorsal interosseous space and hypothenar eminence. Positive Tinel's sign at the elbow and positive flexed elbow test (sustained flexion > 60 seconds) are characteristic.

Treatment depends on the McGowan-Dellon grade: conservative treatment for grade I (night splinting, ergonomics), surgical decompression for grades II-III (in situ decompression or anterior transposition) [3].

  • The ulnar nerve enters the cubital tunnel behind the medial epicondyle, beneath Osborne's ligament (arcuate ligament), between the two heads of the flexor carpi ulnaris. The tunnel floor is formed by the medial collateral ligament and the joint capsule. The nerve is subcutaneous and palpable, exposed to direct compression and stretching during elbow flexion.
  • During elbow flexion, the cubital tunnel narrows by 55%, internal pressure increases from 7 to 14 mmHg, and the ulnar nerve elongates by 5-8 mm. These mechanical constraints explain symptom worsening in flexion and nocturnal paresthesias (sleeping with flexed elbows). Nerve subluxation over the medial epicondyle occurs in 16% of the population.
  • Risk factors: occupations requiring prolonged elbow flexion (desk work, telephoning), direct pressure on the elbow (leaning), prior elbow fracture or dislocation, cubitus valgus deformity, osteoarthritis with osteophytes, diabetes, obesity, hypothyroidism, pregnancy, repetitive elbow flexion-extension movements.
  • Complications of untreated syndrome: progressive intrinsic muscle atrophy (first dorsal interosseous, hypothenar eminence) leading to claw hand deformity (4th-5th fingers), permanent sensory loss in the ulnar territory, loss of fine pinch and grip strength, Wartenberg sign (5th finger abduction), Froment sign (compensatory thumb flexion during pinch).

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  1. Grade I – Mild (intermittent paresthesias)

    Intermittent paresthesias (tingling, numbness) in the 4th and 5th fingers, mainly nocturnal or positional (provoked by sustained elbow flexion). No objective motor deficit. Normal grip and pinch strength. Normal nerve conduction studies or mild slowing. Conservative treatment recommended with good prognosis.

  2. Grade II – Moderate (measurable weakness)

    Persistent paresthesias with measurable weakness of ulnar-innervated intrinsic muscles. Decreased grip and pinch strength on dynamometry. Beginning of first dorsal interosseous muscle wasting. Abnormal nerve conduction studies with slowing across the elbow segment. Surgical decompression recommended (in situ or transposition).

  3. Grade III – Severe (muscle atrophy)

    Marked intrinsic muscle atrophy (first dorsal interosseous, hypothenar eminence), clawing of 4th-5th fingers, significant sensory loss. Positive Froment and Wartenberg signs. Severe motor and sensory conduction abnormalities or absent responses. Surgical decompression with possible anterior transposition. Prognosis more guarded as nerve recovery is incomplete after prolonged denervation.

  4. Grade IIIb – Advanced severe

    Complete paralysis of ulnar intrinsic muscles with severe irreversible atrophy. Fixed ulnar claw deformity. Anesthesia of the ulnar territory. Major functional loss of fine grip. EMG showing absent responses. Surgical decompression with guarded prognosis for nerve recovery. Tendon transfers (Zancolli lasso, FDS to lateral bands) may be necessary to correct the claw deformity and restore hand function.

Medical and Surgical Management

  • Conservative treatment (Grade I): night extension splint to limit elbow flexion during sleep, ergonomic modifications (avoid prolonged flexion, padding for elbow resting), nerve gliding exercises. Success rate of 50-70% at 3 months. NSAIDs and local modalities as adjuncts.
  • In situ surgical decompression: simple release of Osborne's ligament and fascial structures compressing the nerve without moving the nerve. Minimally invasive technique with lower complication rate. First-line surgical option for grades II-III without nerve subluxation. Success rate 75-90%.
  • Anterior transposition of the ulnar nerve: subcutaneous, intramuscular or submuscular. Indicated if nerve subluxation, significant cubitus valgus, failed in situ decompression, or revision surgery. Moves the nerve anterior to the medial epicondyle, removing it from the compression zone and reducing traction during flexion.

Physiotherapy treatment

  • Conservative: ulnar nerve gliding exercises (ULNT3 – Elvey technique), elbow extension night splint (maintaining < 45° flexion), postural education (avoid prolonged flexion, padding for elbow rest). Ergonomic workstation assessment. Neural mobilization 3 times daily.
  • Post-surgical (in situ decompression): early active mobilization from day 1-3. Gentle flexion-extension within pain-free range. Wound care. Progressive nerve gliding exercises from week 2. No forced flexion or direct pressure on the medial epicondyle for 4-6 weeks.
  • Post-surgical (anterior transposition): more progressive mobilization. Sling for comfort 5-7 days. Progressive active flexion from week 1-2 (limited to 90° for 2-3 weeks). Full range from week 4. Scar mobilization from week 3. Grip strengthening from week 4-6.
  • Intrinsic hand muscle rehabilitation: specific strengthening exercises for interossei, hypothenar muscles and adductor pollicis. Rubber band finger abduction/adduction exercises, putty exercises, fine motor activities. Sensory re-education if persistent numbness. Complete recovery of nerve function can take 6-12 months post-surgery.

After the session

You may feel slight fatigue or tightness: this is normal. Continue the exercises taught at home to maintain session benefits.

Questions About Elbow Rehabilitation

When should I start physiotherapy after elbow surgery?

Rehabilitation generally begins between 3 and 21 days after the operation, depending on the type of procedure and the stability of the surgical fixation. For fractures treated with stable internal fixation (screw plate), early mobilization is often authorized from D+3 to D+5 to prevent joint stiffness. In cases of elbow replacement or complex ligament repair, the delay may be extended to 2-3 weeks with initial immobilization in a splint. A systematic review published in the Journal of Shoulder and Elbow Surgery confirms that early mobilization after elbow surgery significantly improves final range of motion without increasing the risk of complications [Hackl et al., 2023] . Your surgeon will advise the optimal timing based on your specific procedure.

What are the goals of elbow rehabilitation?

Elbow rehabilitation pursues several complementary goals, adapted to each phase of recovery. In the initial phase (0-6 weeks), the priority is to restore range of motion in flexion-extension (goal: 30°-130° minimum for daily activities) and in pronation-supination (50° in each direction minimum). In the intermediate phase (6-12 weeks), the focus is on progressive muscle strengthening of the flexors, extensors and rotators of the forearm, as well as restoring joint stability through proprioceptive exercises. In the advanced phase (3-6 months), the emphasis is on functional reintegration: daily activities, work tasks and return to sports. Scientific literature highlights that the minimum functional arc of the elbow (30°-130° of flexion-extension, 50° of pronation and 50° of supination) is necessary to perform 90% of daily activities [Mofidi et al., 2020] . Scar treatment and adhesion prevention complete this comprehensive care approach.

Is elbow rehabilitation painful?

The techniques used are progressive and adapted to your tolerance. The elbow is a joint particularly prone to stiffness and inflammatory reactions: overly aggressive rehabilitation can paradoxically worsen the situation by causing heterotopic ossifications (abnormal bone formations in soft tissues). Exercises must be regular but never forced . The physiotherapist always adapts the intensity to stay below the pain threshold, following the "no pain, more gain" rule specific to the elbow. Gentle, regular active mobilization spread across the day in short sequences is generally preferred to prevent stiffness, with early active mobilization recommended after an elbow injury [Akhtar et al., 2021] . Complementary techniques such as cryotherapy , microcurrents and Novafon vibration therapy also help control pain during sessions.

Scientific sources

Average duration

3 to 6 months for conservative treatment, 3 to 12 months for nerve recovery post-surgery

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