Clinical synthesis based on the most recent meta-analyses and international consensus statements: Cochrane Caliandro 2025, Bateman 2025, McEachan round table 2024, Staples JAAOS 2017, Dy & Mackinnon 2016.

Cubital tunnel syndrome, also known as ulnar neuropathy at the elbow (UNE) in the English-language literature, is the second most common compressive neuropathy of the upper limb after carpal tunnel syndrome.¹ It results from mechanical compression of the ulnar nerve in its medial retro-epicondylar passage, a constrained osteofibrous passage whose volume decreases drastically during elbow flexion.²

How is this condition defined, who does it affect and what are the risk factors?

Clinically, UNE combines paraesthesia of the ulnar territory (little finger and ulnar half of the ring finger), medial elbow pain and, in advanced forms, motor weakness of the intrinsic muscles of the hand (interossei, hypothenar) with visible atrophy.³

The incidence is now better quantified thanks to administrative databases. The American study by Osei and colleagues (2017, national ambulatory database) found an adjusted incidence of 30.0 cases per 100,000 person-years, with a clear sex effect (male/female ≈ 1.5) and a peak incidence between 40 and 60 years.⁴ The cross-sectional prevalence in a metropolitan sample (An & Boone 2017, n = 1,757) varies with the definition: 5.9% with the sensitive definition and 1.8% with the specific definition.⁵

Several risk factors, systemic or biomechanical, have been identified by research.⁶ 🧐 The main ones are:

• Obesity (BMI ≥ 30) : associated with an increased risk of compressive neuropathy in general.⁵
• Diabetes mellitus : increased nerve vulnerability to compression (“double crush” through microangiopathy + metabolic). The Scottish cohort study by Stirling et al. (2023, n = 305 operated patients) confirms that diabetic patients have less favourable post-operative functional results than non-diabetics after cubital tunnel decompression.⁷
• Smoking : a risk factor identified in several cohorts, probably via the microvascularisation of the nerve.⁵
• Biomechanical stresses : prolonged or repeated elbow flexion, direct pressure on the medial side (the “desk sign”), heavy manual work, vibration.⁸ The SR by Fadel et al. (2017, Hand Surg Rehabil) finds converging arguments for intense manual effort as an unfavourable prognostic factor.⁹
• Previous trauma to the elbow: fracture of the medial condyle, elbow dislocation, cubitus valgus as a sequela.¹

What happens in the body, and how does the syndrome evolve naturally?

The pathophysiology rests on the combination of mechanical compression and longitudinal traction of the ulnar nerve on elbow flexion.²

Anatomically, the cubital tunnel is an osteofibrous passage whose floor is formed by the medial collateral ligament (MCL) and the joint capsule, and whose roof is the cubital retinaculum (“Osborne's arcade”).¹⁰ When the elbow goes from extension to flexion, several phenomena add up: stretching of the retinaculum, shortening of the floor, and direct compression of the nerve between the two. The tunnel loses up to 55% of its volume at maximal flexion.²

This chronic compression triggers a biological cascade: local ischaemia, breakdown of the blood-nerve barrier, impaired axonal transport, then segmental demyelination (slowing of conduction velocities) and, at a late stage, axonal degeneration leading to atrophy of the intrinsic muscles of the hand.¹¹ Beyond the cadaveric data, this mechanism explains the predictive value of Froment's sign (weakness of the adductor pollicis with recruitment of the flexor pollicis longus) and of Wartenberg's sign (permanent abduction of the little finger through deficit of the 3rd palmar interosseous).¹²

As for the natural course, two trajectories emerge clearly according to initial severity:

• For mild to moderate cases (mild Dellon or McGowan I), the course under conservative treatment is broadly favourable. The Swedish randomised trial by Svernlöv et al. (2009, n = 70 patients, 6-month follow-up) found an objective improvement in 89.5% of patients whichever arm they were in (night splint, nerve gliding, simple observation), an important result that suggests a strong effect of natural history / spontaneous changes in activity in the less severe cases.¹³
• For severe cases (severe Dellon / McGowan III, with demonstrable atrophy), spontaneous recovery is rare. Surgical decompression within a reasonable time frame is necessary to limit permanent deficits, without however guaranteeing complete motor recovery in long-standing cases.¹⁴

How do you assess and diagnose cubital tunnel syndrome with certainty?

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The diagnosis of UNE rests above all on clinical findings.¹ No single test has perfect accuracy. It is the convergence of arguments (compatible history + ≥ 2 positive tests + consistent sensory territory) that establishes the diagnostic probability. Electrodiagnosis (EDX) and imaging are not routine: they confirm in ambiguous cases, stratify before surgery, or help to exclude a differential diagnosis.²

Which questions should you ask to understand the patient and their history? 🤔

The structured interview systematically explores:

• Location : paraesthesia / hypoaesthesia strictly within the ulnar territory: the whole little finger + ulnar half of the ring finger + ulnar border of the dorsum of the hand (the latter spared in compression at Guyon's canal).¹
• Behaviour : triggered by sustained elbow flexion (holding the phone, driving, sleeping with the arm bent), direct pressure on the medial side of the elbow (desk sign), repeated flexion-extension movements.³
• Chronology : intermittent vs constant, presence or absence of night waking (highly suggestive because the elbow is spontaneously flexed during sleep), length of history.¹
• Motor signs : loss of fine dexterity (buttoning, pinching), dropping objects, fatigability of the hand. These signs point to motor involvement and require urgent assessment.²
• Past history : fracture/dislocation of the elbow, cubitus valgus, osteoarthritis, rheumatoid arthritis, diabetes, at-risk occupation, overhead sport.⁴

Which clinical tests should be performed, and which other conditions need to be ruled out? 🩺

The examination aims to reproduce the symptoms and to document objectively the sensory and motor deficits. The main tests, with their diagnostic values validated in meta-analyses or prospective studies:

⚠️ Caution on the Scratch Collapse Test : although the original study by Cheng (2008) reports a sensitivity of 69% for the cubital tunnel,⁵ the systematic review by Čebron and Curtin (2018) finds very high heterogeneity between studies (sensitivities from 0.24 to 0.77, NPV from 0.15 to 0.92).⁶ Performance probably depends on the clinician's expertise and on standardisation of the technique. The SCT should therefore be included in the battery but cannot be used in isolation.

Should patients be classified, and what are the benefits? 📈

Classifying severity has a direct impact on therapeutic strategy and prognosis. Two systems coexist and remain the reference:

The study by Choi et al. (2022) demonstrated the acceptable inter-observer reliability of the modified McGowan score (κ = 0.73) and its concurrent validity with the Dellon scores and functional questionnaires.⁷ These classifications can therefore be used in clinical practice to stratify, to share a decision with the patient, and to communicate between physiotherapist and surgeon.

⚠️ The diagnosis-EDX paradox deserves emphasis: up to 38% of patients with a suggestive clinical picture have normal electrodiagnostic results in the initial phase.⁸ This means that EDX confirms but cannot exclude the diagnosis. The clinician must decide on the basis of the convergence of arguments, not a single test.

Management follows a stratified algorithm according to initial severity (McGowan/Dellon) and the response to conservative treatment.¹

Where do you start? What is the recommended hierarchy of interventions?

For mild to moderate cases (mild Dellon / McGowan I-IIA), first-line treatment is conservative for 3 to 6 months, in line with the updated recommendations of the McEachan 2024 round table.³ For conservative treatment, the 2025 Cochrane review provides only isolated trials.² Three pillars structure this protocol. 🎯

Pillar 1: Education and activity modification (the most worthwhile intervention, unanimously recommended²).⁴ The patient must understand:

• Avoid prolonged and sustained flexion of the elbow (phone, driving, pillow).
• Avoid direct pressure on the medial side of the elbow (“desk sign”, armrest, lever).
• Use protective padding (sleeve, cushion) if the occupational activity is at risk.²
• Sleep hygiene: a pillow to avoid bending the elbow under the head, sometimes a soft, non-occlusive orthosis.

Pillar 2: night splint in near-extension (30 to 45°). A 2025 systematic review of splinting (Bateman 2025, 5 studies) includes only one randomised trial against advice alone, at high risk of bias, underpowered and with many participants lost to follow-up: no difference between the groups. A second trial and three single-arm series, at high risk of bias, show that most mild to moderate forms improve, without it being possible to distinguish the effect of the splint from that of time. The certainty is very low and the authors judge the evidence insufficient to say whether it should be recommended: it is therefore offered as a trial, with reassessment at 3 months.⁵ The splint aims to prevent the maximal spontaneous flexion during sleep, the position that places the most strain on the nerve: this is mechanical reasoning, not evidence of effect.⁶

Pillar 3: Neurodynamics / nerve gliding and progressive reconditioning, integrated into a multimodal programme (see below).

What is the place of exercise and neurodynamics?

The neurodynamic techniques (gliding, controlled tensioning, sliders/tensioners) aim to restore the excursion of the ulnar nerve within its anatomical interface and to reduce post-inflammatory adhesions.⁷ Their biomechanical rationale is sound (Coppieters & Butler 2008 showed that gliding techniques increase excursion without neural tension, whereas tensioning techniques increase tension).⁷

However, the level of clinical evidence remains moderate to low. The Cochrane review was updated in April 2025 (15 trials, 970 participants): for conservative treatment of mild to moderate forms, it reports only isolated trials (information, night splint, nerve gliding, injections), and a small trial indicates that, in mild forms, information on the positions to avoid may reduce discomfort.² The trial comparing night splint, nerve gliding and information alone finds no difference in functional outcome at 6 months.⁶ This result does not mean that neurodynamics is useless, but that it does not replace education or the rest of the programme, and that it should be used as a multimodal adjunct, monitored to avoid any symptomatic worsening (neural irritation through over-dosing).⁸

Manual therapies, technologies: how effective are they really?

Several modalities are frequently offered in practice, but their level of evidence is generally low for this specific condition:

Beyond the physical: patient education and psychosocial factors?

Therapeutic education is the most worthwhile and best-evaluated intervention for compression neuropathies of the upper limb.⁹ It allows the patient to become an active partner in their care, durably changes their habits (sleep, ergonomics, vibration) and reduces attendance for acute care.

💡 The psychosocial dimension should not be neglected. Biopsychosocial models of chronic pain apply here: kinesiophobia, catastrophising, anxiety and depression modulate pain perception and functional disability, independently of electrophysiological severity.¹⁰ In a patient with persistent symptoms despite an EDX of low severity, screening for these dimensions with brief tools (PCS, TSK-11) is useful and points to integrated management (CBT, graded exercises, desensitisation).

Long-term management aims to consolidate the gains obtained in the initial phase and to minimise the risk of recurrence or chronicity. It relies on patient accountability and on a resumption of occupational or sporting activities that is rigorously planned. 🛡️

How do you make the patient an active participant in their recovery through self-management?

Patient empowerment is the cornerstone of prevention.¹ The operational components:

• Permanent ergonomics : avoid prolonged and sustained flexion and direct pressure on the medial side. Adjust the chair height and the keyboard angle, and use protective sleeves for at-risk occupations.²
• Sleep hygiene : wearing a light splint or a soft sleeve for 3 to 6 months, until symptoms stabilise; then gradual weaning.³
• Home exercise programme : gentle nerve sliders, active elbow range-of-motion exercises, strengthening of the intrinsic muscles of the hand (thumb-index pinch, finger abduction-adduction against light resistance).⁴
• Self-monitoring : react early to signs of worsening (increasing paraesthesia, fatigability of pinch) by readjusting loads before symptoms become established.¹

When and how should you plan a safe return to sport and activities?

🧠 Return to activities with high demands (sport, physical work, instruments) must be gradual and individualised, based on functional criteria and not on a fixed timetable. The progression criteria validated in clinical practice:

1. Neurological symptoms resolved at rest and absent during activities of daily living.
2. Recovery of grip and pinch strength ≥ 90% of the contralateral side (dynamometer, pinch-meter).⁵
3. Functional test reproducing the sporting/occupational movement without provoking symptoms over 24-48 h.
4. Sensation restored in the ulnar territory (Semmes-Weinstein or monofilament).

Return is organised in steps: specific exercises without impact → simulated movements at low speed → modified practice at 50-70% intensity → full training → competition. Each step must be validated by 24 to 48 h without exacerbation.

The biomechanical analysis of the movement (sport or workstation) is essential: a technical flaw (throwing mechanics, tennis stroke, welding position) can impose excessive valgus stress on the elbow and perpetuate the condition. Referral to a strength and conditioning coach, a sports physician or an ergonomist may be appropriate.

The overhead athlete (baseball pitcher, javelin thrower, tennis player, volleyball player, handball player) constitutes a distinct subpopulation in ulnar pathology at the elbow. The nature, intensity and frequency of chronic valgus stresses on the elbow create a specific pathophysiology that deserves a dedicated approach.

Chronic valgus mechanism and associated MCL instability

During an overhead throw, in the late cocking and acceleration phases the elbow undergoes a valgus stress that can exceed 64 N·m (that is, a load greater than the ultimate strength of the isolated medial collateral ligament in the laboratory).¹ This cyclic stress causes:

• The progressive elongation of the MCL with chronic micro-tears (valgus laxity), or even frank rupture in extreme cases (“UCL injury”).
• The longitudinal traction and dynamic compression of the ulnar nerve at the retro-epicondylar passage, accentuated by widening of the valgus space at the end of extension.
• Sometimes an anterior dynamic dislocation of the ulnar nerve on flexion, audible (“snapping”) and palpable, which is self-perpetuating through friction.²

The typical clinical picture in the overhead athlete therefore combines medial elbow pain (MCL + flexor-pronator insertion), delayed ulnar paraesthesia (post-exercise, worsened by cold or by stepping up training), and sometimes weakness of pinch or of grip on the ball/racket. ⚠️ The differential diagnosis between MCL injury, isolated ulnar neuritis and structural cubital tunnel syndrome is crucial, and often intertwined (combined injury).

Specific management and pre-surgical stratification

Management in the overhead athlete follows the same hierarchy, conservative → surgical, but with specificities:

• Temporary rest from sport with complete cessation of throwing for 4 to 6 weeks, maintenance of physical conditioning and of the core musculature.³
• Specific strengthening of the flexor-pronators (pronator teres and the long flexor, flexor carpi ulnaris) which act as dynamic medial stabilisers of the elbow.
• Video analysis of the throwing mechanics : looking for errors (“inverted W”, arm behind the trunk, opposite lateral flexion) that increase valgus stress.⁴
• Systematic imaging if there is no response at 6 weeks: MRI with arthrography (looking for a grade ≥ 2 MCL lesion), dynamic ultrasound for snapping.
• Surgical decision coordinated between the hand orthopaedic surgeon and the sports physician: anterior transposition (subcutaneous or submuscular) rather than simple decompression if snapping or proven valgus laxity.

⚾ Special case of UCL reconstruction (“Tommy John surgery”): in MLB pitchers with an MCL injury and associated ulnar neuritis, several studies find that the presence of pre-operative neuritis impairs return to sport. Concomitant transposition of the nerve at the time of reconstruction does not seem to change the overall prognosis for return, but the data remain heterogeneous.⁵

The study of published cases makes it possible to transpose the data from SR/MA and trials to the heterogeneous reality of the field. 👨‍⚕️ All the cases that follow are drawn from verified PubMed/PMC publications, never invented.

Analysis of a typical case: from assessment to conservative resolution

In the night-splint arm of the original RCT by Svernlöv et al. (2009, n = 70, mild to moderate cases),¹ patients were assessed before treatment, at 3 and at 6 months by: COPM (Canadian Occupational Performance Measure), VAS pain, grip strength, and ulnar nerve conduction at the elbow. The night splint held the elbow at about 45° of flexion, worn every night for 6 months.

Pooled results (all arms combined, mild/moderate): 89.5% of patients with objective improvement (VAS, COPM, strength) at 6 months, with no statistically significant difference between the arms (splint, gliding, observation). No patient's motor score worsened. Nerve conduction improved in 50% and remained stable in 30%.¹

📌 Clinical lessons from this typical case :

• For mild to moderate cases, the conservative treatment works in the great majority of cases, but the effect of natural history and spontaneous changes in activity is probably the major factor, not the splint alone.
• Clinical improvements often precede electrophysiological improvements, which justifies not following patients on NCS alone.
• Simple structured observation (without active therapeutic intervention) remains a legitimate option in the patient who is asymptomatic on waking.

The diagnostic challenge: when the cubital tunnel mimics another condition

The cubital tunnel shares sensory territories with other conditions, hence the risk of diagnostic wandering. An updated narrative review stresses that C8-T1 radiculopathy, thoracic outlet syndrome and compression at Guyon's canal are the three major mimics that must be known.²

⚠️ The role of “double crush” lesions deserves emphasis: a patient may suffer simultaneously from a proximal compression (cervical spine, brachial plexus) and a distal one (cubital tunnel), each contributing to the symptoms without either being sufficient on its own. This hypothesis, proposed by Upton & McComas in 1973³, remains debated but probably explains the persistence of symptoms after isolated local surgery in some patients.

📌 Good clinical practice :

• Always assess the cervical spine (Spurling, segmental mobility) in a patient with UNE.
• Systematically test sensation on the ulnar border of the dorsum of the hand : preserved = compression at Guyon's canal; affected = more proximal compression (including the cubital tunnel).
• If symptoms and EDX are dissociated, widen the work-up: cervical MRI, high-resolution ultrasound along the whole course, blood glucose/HbA1c.

Study of a complex case (rare anatomical cause or recurrence)

Several subtypes fall outside the usual framework:

Case 1 - Anconeus epitrochlearis muscle (anatomical variant) : this accessory muscle, which is not always present, occupies the roof of the cubital tunnel and can compress the ulnar nerve there. The series by Kim et al. (Hand 2019, n = 13) confirms that this accessory muscle is a cause of dynamic cubital tunnel syndrome, causing problems of symptom localisation on flexion. The myotomy / resection of the muscle in addition to decompression resolves most cases.⁴ Diagnosis: dynamic ultrasound (Sookur 2008) or MRI.

Case 2 - Rheumatoid arthritis with synovitis : RA can compress the ulnar nerve at the elbow through hypertrophic synovitis of the elbow (more rarely through eventual mechanical rupture of the nerve, an exceptional case reported by Iyengar 2007).⁵ Treatment combines medical optimisation of RA (DMARDs, biologics) and, if necessary, surgical decompression with synovectomy. The Stirling 2023 meta-analysis confirms that systemic comorbidities (RA, diabetes) worsen post-operative results.⁶

Case 3 - Recurrence after in situ decompression : 5-15% of patients relapse after simple decompression. Reviews of revision surgery (Aleem 2014, Krogue 2015) show that a revision subcutaneous or submuscular anterior transposition gives good results in about two thirds of patients, provided the cause of the primary failure is clearly identified (fibrosis, dislocation, perpetuation of activity-related stresses).⁷

Applying research-based recommendations is the bridge between science and improved outcomes. It requires knowing what to do, how to integrate it, when to collaborate and how to measure impact. 🧑‍⚕️

When and to which professionals should you refer?

The fundamental competence of the front-line physiotherapist is to recognise the limits of their scope of practice and to identify situations requiring collaboration or medical referral. The IFOMPT-JOSPT 2020 framework (Finucane) remains a transferable reference for taking red flags into account in musculoskeletal practice.¹

Beyond emergencies, referral should be considered in the case of:

• Failure of conservative treatment at 3-6 months that has been properly carried out → hand surgeon.²
• Dominant psychosocial factors (severe kinesiophobia, catastrophising, depression, fear of movement) → general practitioner, pain psychologist.
• Overhead athlete or patient with high occupational demands → sports physician, ergonomist, hand surgeon.
• Presence of a systemic comorbidity (RA, poorly controlled diabetes, thyroid dysfunction) → general practitioner for medical optimisation.

How do you measure outcomes and overcome barriers to implementation?

Objective, standardised measurement of outcomes is essential to evaluate effectiveness and adapt management. 👍

Recommended outcome measures for UNE :

• DASH (Disabilities of the Arm, Shoulder and Hand): a general functional questionnaire, internationally validated, French version available. Score 0 (normal) to 100 (maximal disability). MCID ≈ 10 points.³
• PRWE / PRUNE (Patient-Rated Wrist Evaluation / Patient-Rated Ulnar Nerve Evaluation): the PRUNE version was developed specifically for ulnar neuropathies (MacDermid 2015).
• BCTQ (Boston Carpal Tunnel Questionnaire): initially for carpal tunnel but used in practice for upper limb neuropathies; good sensitivity to change.
• Grip and pinch strength (Jamar dynamometer, pinch-meter): objective bilateral comparative measurement.
• VAS pain (visual analogue scale 0-10) and symptom frequency (days/week).

Barriers to implementation of evidence-based practice, identified by the SRs on EBP in physiotherapy (Al Zoubi 2018):

• Lack of time in consultation.
• Difficulty accessing scientific databases (PubMed, Cochrane).
• Weak continuing education in critical reading and appraisal of evidence.
• Entrenched professional habits (“we've always done it this way”).

Identified facilitators :

• Clinical leadership and an institutional culture favourable to EBP.
• Communities of practice and regular journal clubs.
• Integration of PROMs into the electronic patient record.
• Use of checklists and standardised protocols derived from SR/MA.