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Elbow neuropathies: ulnar (cubital tunnel), radial, and median nerve compression – diagnosis & management strategies.

128 citationsUpdated Oct 2026

Overview

Compressive neuropathies of the upper extremity represent a spectrum of conditions where peripheral nerve injury can dramatically affect a patient's life [4]. Diagnosis relies on a combination of clinical presentation, physical examination, imaging, and electrodiagnostic studies, as no true diagnostic gold standard exists for most conditions [5]. Patient demographics across various compressive neuropathies are not homogeneous, suggesting distinct etiologies [8]. While nonsurgical treatment is successful in most patients with mild nerve dysfunction [32], symptoms are often refractory to conservative management in more severe cases, where surgical decompression leads to nearly 90% symptom resolution [1]. Surgery is usually indicated if symptoms persist or muscle weakness develops, with the specific procedure depending on neuropathy severity and patient factors [2].

Treatment strategies vary by nerve involvement. For radial nerve palsy, non-operative management is usually satisfactory, though surgery is indicated for nerve transection or lack of improvement after conservative treatment [43]. Conversely, surgical decompression of the median or anterior interosseous nerves in the forearm is rarely indicated, warranting a prolonged nonsurgical approach in most cases [61]. Regarding ulnar neuropathy at the elbow, current evidence suggests that different surgical methods do not differ in clinical outcomes [60], and no single procedure has shown superiority over another [20]. Individualized treatment is emphasized to improve symptoms and maximize nerve recovery potential [20]. Decompression generally yields good outcomes for the majority of patients, with preoperative symptoms and intraoperative observations related to final results [15]. Patients typically show significant improvement in subjective and objective symptoms, though variable residual neuropathy persists [7].

Prognostic factors and complications guide management. Nerve-conduction studies serve as a prognostic factor, with patients exhibiting motor abnormalities appearing to have more favorable results than those with only sensory abnormalities [23]. Poor outcomes are mainly related to the severity of the neuropathy according to the clinical stage, specifically the McGowan/Goldberg (McGG) classification [26]. In one study, the group with moderate symptoms had 97% good and excellent results, while the severe symptom group had 89% good and excellent results, contradicting the view that transposition is necessary for advanced neuropathies [27]. Complications include iatrogenic injury, treatment failure, and pathologic pain syndromes, with prevention relying on a solid understanding of normal anatomy and anatomic variations [6]. The field continues to evolve with technology, shifting towards preoperative imaging with ultrasound and MRN, while the management of failed decompressions remains challenging [9]. Expert consensus on best practice for the clinical use of these references is lacking and should be a logical next step in the deployment of ultrasound for upper extremity neuropathy evaluation [13]. Clear definitions of recurrence versus persistent compression neuropathy, agreements on supplementary diagnostics, and standardized outcome measurements are required to enable comparing results from different techniques and clinics [3]. A standardized assessment protocol for ulnar neuropathy is required for future comparison trials [110].

Anatomy & Pathophysiology

Bony Anatomy

The elbow is a trocho-ginglymoid joint consisting of medial and lateral articulations that provide bony stability [73]. The ulnohumeral joint forms where the trochlea articulates with the ulna within the greater sigmoid notch, providing highly congruent anatomy through almost 180° of articular contact, except for a bare area on the greater sigmoid notch devoid of cartilage [73]. The radiocapitellar joint is formed by the articulation of the capitellum and the radial head, which is a concave elliptical structure covered with articular cartilage along the radiocapitellar joint and approximately 270° of the articular margin [73]. The distal humeral articular surface is angled 30° from the longitudinal axis of the humerus [73] and is internally rotated 3 to 8 degrees axially [92]. The axis of rotation of the elbow is angulated 5° to 7° in the coronal plane relative to the epicondylar axis, with the medial side more distal than the lateral side [73]. In the coronal plane, the trochlea is more distal than the capitellum, resulting in a valgus alignment of 4 to 8 degrees [92], while the overall valgus angle of the elbow in extension, including the ulna, is 10 to 17 degrees [92]. The normal valgus carrying angle of the elbow is 5 to 10 degrees for men and 10 to 15 degrees for women [84].

The distal humerus consists of medial and lateral columns, with the medial column diverging approximately 45 degrees from the humeral shaft in the coronal plane [92] and the lateral column diverging at approximately 20 degrees [92]. The lateral column curves anteriorly, creating a 35 to 40 degrees angle with the shaft in the sagittal plane [92]. The ulna bends approximately 8° medially at 8 cm from the tip of the olecranon [73], and the articulation to the tip of the coronoid is approximately 30° from the long axis of the ulna in the sagittal plane [73]. The trochlea is covered by articular cartilage anteriorly, inferiorly, and posteriorly, creating an arc of almost 270 degrees [92] or a 300-degree arc of cartilage [87]. The olecranon fossa and coronoid fossa are separated by a thin bony septum, which is occasionally absent [92]. In full extension, 60% of axial load is transmitted through the radiocapitellar joint [84].

Ligamentous Anatomy

The medial ulnar collateral ligament (MUCL) is the primary restraint to valgus stress within functional elbow range of motion [84]. It originates on the posterior medial epicondyle and inserts on the sublime tubercle of the medial coronoid process [84]. The anterior bundle of the MUCL is the strongest component and primary restraint to valgus stress [72], while the posterior bundle becomes taut at flexion beyond 120 degrees [74] and is the primary restraint to valgus stress with the elbow in maximal flexion [84]. Stability in full elbow extension is provided by the MCL, joint capsule, and ulnohumeral articulation [84].

The lateral collateral ligament complex consists of the radial collateral ligament, the lateral ulnar collateral ligament (LUCL), and the annular ligament [92]. The annular ligament attaches to the anterior and posterior margins of the lesser sigmoid notch [92]. The radial collateral ligament originates from an isometric point on the lateral epicondyle and fans out to attach to the annular ligament [92]. The LUCL arises from the isometric point on the lateral epicondyle and attaches to the crista supinatoris of the proximal ulna [92], functioning as a posterolateral stabilizer [74]. The LCL complex functions as an important restraint to varus and posterolateral rotatory instability [92]. It is vulnerable to injury during application of a direct lateral plate, so exposure of the lateral aspect of the distal lateral column should not extend past the equator of the capitellum [92]. Osborne’s ligament stabilizes the ulnar nerve in the cubital tunnel [74]. The ligament of Struthers is a variant anatomy arising from the supracondylar process to attach to the medial epicondyle and is a potential site of median nerve compression [74].

Neurovascular Anatomy

The median nerve and brachial artery are located just superficial to the anteromedial joint capsule and brachialis muscle [94]. On the anterolateral side of the elbow, the radial nerve splits into the superficial sensory branch and the posterior interosseous nerve [94]. The posterior interosseous nerve is just superficial to the anterior joint capsule at the level of the radiocapitellar joint and courses longitudinally along the medial side of the capitellum [94]. At the level of the radial neck, the posterior interosseous nerve may come in direct contact with the joint capsule [94]. The ulnar nerve is located just superficial to the posteromedial joint capsule [94].

The radial nerve enters the interval between the brachialis and brachioradialis muscles in the proximal angle of the lateral approach wound [78]. The deep branch of the radial nerve enters the supinator muscle and must be protected during lateral approach exposure [78]. The radial and posterior antebrachial cutaneous nerves are at greatest risk during creation of the proximal lateral arthroscopic portal [83]. The medial antebrachial cutaneous nerve is near the anteromedial arthroscopic portal and should be localized first under direct visualization [83]. The ulnar nerve passes through the cubital tunnel at the medial column of the elbow [87] and lies in a bony groove covered and restrained by the arcuate ligament posterior to the medial epicondyle [88]. It enters the anterior forearm by traveling between the two heads of the flexor carpi ulnaris [87].

Pathophysiology

Nerve compression syndromes are more frequent in the upper extremity than the lower limb due to increased mobility [22]. Nerve compression injuries are caused by both static and dynamic factors [22]. Static factors include anatomical components such as an unyielding tunnel or musculotendinous anomaly [22]. Dynamic factors include mobility, muscle contraction, and nerve mobility during repetitive movements [22]. Double crush syndrome was first described by Upton and McComas in 1973 [22]. Pre-existing subclinical mechanical compression of the nerve at a different location may increase the susceptibility of the same nerve to compression at a second, more distal site [70].

Compression is usually regarded as the principal mechanism of nerve damage in peripheral neuropathy [70]. Nerve damage may occur by direct mechanical compression or by compression of the intrinsic blood supply to the nerve, causing local ischaemia [70]. Mechanical compression forces of > 30 mm Hg retard blood flow [70]. Compression interferes with axonal transport pathways [70]. Larger fibres containing more myelin are more susceptible to compression than smaller non-myelinated fibres [70]. Compression is most effective at the edge of the compression area, known as the "edge effect" [70]. Previous injuries to the nerve may tether it to the walls of the tunnel, prevent normal sliding, and expose it to traction injuries [70]. A tight tunnel may predispose the nerve to friction and compression [70].

Neuropathy in diabetic patients is caused by sustained hyperglycemia leading to the formation of advanced glycation end products (AGE) [28]. AGE cause direct neuronal injury and microvascular damage, negatively affecting peripheral nerve function [28]. Sustained hyperglycemia causes excess production of reactive oxygen species, resulting in direct damage to intracellular proteins and membrane lipids [28]. Excess production of superoxide species disrupts nitric oxide function, causing vasoconstriction and subsequent ischemia and end-organ damage [28].

The ulnar nerve requires over 2 cm of unimpeded movement both at the elbow and wrist to perform full motions of the upper extremity [128]. Maximum strains in the ulnar nerve occur at maximum elbow flexion and directly behind the medial epicondyle [135]. The range of maximal ulnar nerve strains at the elbow is 0% to 14% [135]. Tearing of the ulnar collateral ligament significantly increases elbow valgus laxity, which elongates the ulnar nerve during simulated throwing motion [138]. In stage IV cubital tunnel disease, pressure adjacent to the ulnar nerve increases in both elbow extension and elbow flexion [151]. Increased pressure in the cubital tunnel is important because exposure to lesser extraneural pressure by repetitive non-maximum elbow flexion might be more deleterious [153]. Shoulder position changes the ulnar nerve strain around the elbow in living patients with cubital tunnel syndrome [155]. Increased elbow flexion in patients with cubital tunnel syndrome influences the intraneural blood flow of the ulnar nerve [159]. Ulnar nerve gliding is most severe during passive wrist movement in elbow flexion and forearm supination [163].

The elastic limit in the peripheral nerve varies from 7–20%, and failure strain varies from 7–30% [189]. The maximal elastic limit for the nerve root is less than 15%, and failure strain occurs at 25% [189]. The initial process of nerve elongation is "physiologic" in nature, described as unfolding of the connective tissues of the nerve [189]. The ulnar nerve is located superficially at the elbow and passes through tight anatomical spaces [188]. It is closely associated with sharp edge-like structures such as the arch at the flexor carpi ulnaris muscle origin and the medial intermuscular septum [188]. The ulnar nerve is stretched and compressed every time the elbow is flexed [188]. Continuous and repeated stress on the ulnar nerve is normally moderated by a natural sliding of the nerve over several millimetres with extension and flexion [188].

The cubital tunnel is the focus of the problems facing the ulnar nerve at the elbow [172]. Anterior transposition of the ulnar nerve eliminates natural and pathological traction and compression forces, relieving the nerve of potential microcirculation compromise [175]. Maximal pressure in the cubital tunnel does not begin until after 90° flexion [182]. The pathogenesis of cubital tunnel syndrome caused by osteoarthrosis involves entrapment neuropathy where the primary cause is degenerative osteophytes originating from the humeroulnar joint [185]. The incidence or severity of neuropathy in cubital tunnel syndrome is not necessarily proportional to the degree of joint degeneration [185]. After medial epicondylectomy, foci of compression may remain untreated and result in early postoperative failure [185]. In Osborne's procedure, the ulnar nerve can be decompressed in situ without injuring the extrinsic blood supply to the nerve [185]. Subsequent recurrence of symptoms after Osborne's procedure may result from secondary entrapment caused by postoperative fibrosis [185]. Osteophytes on the medial ridge of the olecranon and the trochlea underneath the ulnar nerve may remain untreated after Osborne's procedure [185]. Anterior transposition removes the nerve from the environment of the cubital tunnel but can create other levels of mechanical impingement or perineural fibrosis [185].

The throwing elbow is a common source of nerve injuries due to the unique combination of anatomy, high forces, and sheer repetition associated with throwing sports [169]. It is important to carefully trace the path of the ulnar nerve through imaging and physical examination when bony variants are present in the elbow joint [170]. Dynamic compressive neuropathies around the elbow are rare entities that present unique diagnostic challenges, often requiring dynamic nerve conduction studies for diagnosis [14].

Classification

Ulnar Nerve Severity Staging

McGowan: McGowan introduced a three-grade classification system for ulnar nerve function in 1950 [33]. This system functions essentially as a preoperative rating of intrinsic muscle function [33]. Grade I represents a minimal lesion characterized by paresthesias and numbness without weakness, with no detectable motor weakness of the hand [33, 58]. In mild cases, symptoms are intermittent and include occasional paresthesia; patients might have complaints of weakness, but findings of the motor examination are typically normal [69]. Grade II is an intermediate lesion characterized by wasting of the interosseous muscles, sensory disturbance, and some interosseous muscle weakness [33, 58]. In moderate cases, paresthesias are intermittent, a decrease in vibratory sensation might be present, a discrepancy in intrinsic strength compared with the unaffected side might be present, and results of provocative tests are positive [69]. Grade III is a severe lesion characterized by complete intrinsic muscle paralysis and profound weakness of the interossei [33, 58]. In severe cases, patients might complain of constant numbness in the ulnar nerve distribution in the hand, might have abnormal results of the two-point discrimination test, and present with atrophy of the ulnar innervated intrinsics and obvious weakness [69]. The distinction between Grade II and Grade III is based solely on the degree of muscle weakness [33]. Sensory findings were later included into the McGowan staging classification [69]. Poor outcomes in cubital tunnel syndrome are mainly related to the severity of the neuropathy according to this clinical stage, specifically the McGowan/Goldberg (McGG) classification [26].

Alternative and Comprehensive Staging Systems

Dellon and Gabel Amadio: Dellon and Gabel Amadio developed more comprehensive staging classifications using additional diagnostic criteria [69]. Dellon and colleagues used a numeric grading scale to categorize patients based on symptoms [69]. A score of 0 indicated normal results [69]. Scores of 1 and 2 included intermittent paraesthesias and mild weakness observed during pinch and grip tests [69]. Scores of 3 and 4 included vibratory changes and moderate objective weakness [69]. A score of 5 indicated persistent paresthesias [69]. A score of 6 showed abnormal two-point discrimination [69]. Scores 7 through 10 evidenced muscle atrophy [69].

Akahori and Gu: The Akahori and Gu classification incorporates electrodiagnostic criteria in the form of conduction velocities [168].

Other Considerations: There is no consensus on any scoring system for ulnar neuropathies [33]. Available scoring systems either rate subjective symptoms, which are difficult to quantify, or fail to compare preoperative and postoperative conditions [33]. There is no reliable grading system that directs treatment and predicts outcome for cubital tunnel syndrome [168]. The McGowan–Golberg and Dellon classifications are based on symptoms and/or clinician opinion, without objective measures of function [168].

Ulnar Tunnel Syndrome Classification

Ulnar Tunnel Syndrome: Ulnar tunnel syndrome is classified into two distinct types [140]. Type 1 involves compression at the level of the pisiform with sensory and motor involvement [140]. Type 2 involves compression distal to the pisiform with motor involvement only [140].

General Neuropathy Classification and Etiology

Nerve Compression Syndromes: Nerve compression syndromes are due to both static and dynamic factors [22]. Static factors may include anatomical components such as an unyielding tunnel or musculotendinous anomaly [22]. Dynamic factors include mobility, muscle contraction, and nerve mobility during repetitive movements [22].

Epidemiology and Injury Patterns: Ulnar neuropathies are more frequent in men [34]. Radial neuropathies are rare [34]. Most nerve lesions sustained by athletes are best described as neuropraxias, which is the mildest form of nerve injury denoting a conduction block where all nerve elements remain in continuity [154].

Charcot-Marie-Tooth Disease: Charcot-Marie-Tooth disease is a progressive neuropathy that affects both the lower and upper extremities [40]. It was initially reported by Virchow in 1855 but was more clearly defined in separate reports by Charcot and Marie and by Tooth in 1886 [40]. Onset is commonly in childhood, consisting of progressive weakness and muscle atrophy affecting the feet and legs first and then the hands and forearms [40]. The disease is characterized by early involvement of the peroneal muscles, the presence of foot deformity, lesser severity of the sensory loss, and a tendency for more than one family member to be affected [40]. Charcot and Marie considered a myelopathy as the basic pathosis whereas Tooth favored a neuropathy [40]. The introduction of nerve conduction studies in the 1950s began to shed light on the classification of peroneal muscular atrophy and its related disorders [40]. Dyck and Lambert found that severe conduction slowing was consistent within family members affected by CMT disease [40]. Dyck and Lambert defined two broad categories of patients with CMT disease [40]. The first category showed severely reduced nerve-conduction velocities associated with segmental demyelination, sometimes associated with hypertrophic changes [40]. This first category was subdivided into the hypertrophic neuropathies of Charcot-Marie-Tooth and Dejerine-Sottas types [40].

Clinical Presentation

General Principles and Etiology

Nerve compression syndromes are more frequent in the upper extremity than the lower limb due to increased mobility [22]. These injuries arise from static factors, such as anatomical components like unyielding tunnels or musculotendinous anomalies, and dynamic factors, including mobility, muscle contraction, and nerve mobility during repetitive movements [22]. The basic pathophysiology is complex and multifactorial, involving changes in intraneural circulation and nerve fiber structure [21]. Patient demographics for various compressive neuropathies are not homogeneous, suggesting different etiologies [8]. A broad spectrum of histopathology may mimic nerve compression syndromes, requiring the inclusion of unusual causes such as tumours and tumour-like lesions in the differential diagnosis [31]. Compression neuropathies are a significant source of pain in the upper extremity [77]. Nontraumatic neuropathies of the upper limb are rare in children, and high-quality evidence regarding diagnostics and treatment remains limited [19].

Carpal Tunnel Syndrome

Carpal tunnel syndrome is the most common compression neuropathy of the upper extremity [36]. The mean age at diagnosis is 50 years, and the condition is more common in women than men by nearly four times [36]. By the age of 65 years, the prevalence is approximately 5.1% for women and 1.3% for men [36]. Risk factors include obesity, pregnancy, hypothyroidism, diabetes mellitus, and menopause [36]. The American Academy of Orthopaedic Surgeons guidelines list body mass index (BMI) and high hand repetition rate as factors with strong evidence of increased risk for development of carpal tunnel syndrome [36].

Clinically, the syndrome classically presents with nocturnal paresthesias in a median nerve distribution that gradually worsen as nerve injury progresses [36]. Late in the disease course, patients may develop sensory loss and thenar muscle atrophy [36]. Many patients report pain in the hand or symptoms not directly referable to the median nerve [36]. A positive Tinel sign at the wrist or development of symptoms after a provocative Phalen maneuver can aid in diagnosis, though reported specificity for these tests varies from 55% to 100% [36]. Differentiating features between carpal tunnel syndrome and pronator syndrome should be understood, and evaluation for one site of median nerve compressive neuropathy should always include the other potential sites [29]. Patients presenting with median nerve symptoms must be assessed both at the wrist and proximally to exclude compression elsewhere [30]. A diagnosis of ulnar nerve compression merits a comprehensive workup by the treating surgeon and a high suspicion for concomitant median nerve compression [50].

Cubital Tunnel Syndrome

Cubital tunnel syndrome is the second most common nerve compression syndrome in the upper limb [44]. Ulnar nerve entrapment is the second most common nerve entrapment syndrome of the upper extremity, most commonly occurring in the cubital tunnel [51]. Paresthesia and weakness are the most common presentations [44]. The condition classically presents with arm and hand pain and associated sensory and motor dysfunction [81]. Clinical findings of localized pain or tenderness at the medial elbow, night-time paresthesias, aggravation of symptoms with elbow flexion, and motor or sensory changes of the ulnar nerve in the absence of previous injury should alert the clinician to the presence of ulnar neuropathy at the elbow [57]. Patients with cubital tunnel syndrome are more likely to present with muscle atrophy, reflecting advanced nerve damage that may not respond to surgery [49].

Diagnostic Evaluation and Testing

Diagnosis of compressive neuropathies relies on a combination of clinical presentation, physical examination findings, imaging modalities, and electrodiagnostic studies, as there is no true diagnostic gold standard for most conditions [5]. Electrodiagnostic studies, when used in combination with clinical findings, can improve diagnostic reliability significantly [45]. Nerve conduction and electromyographic studies are useful in confirming a diagnosis of cubital tunnel syndrome and assessing its severity [46]. Electrodiagnostic testing can help determine the presence of an injury to the ulnar nerve, the location of the injury, the possibility of a multiple site (double crush) injury, and the existence of segmental demyelination and/or axonal degeneration [46]. It can also help differentiate a focal or systemic neuropathy and identify myopathy or motor neuron disease that may mimic focal neuropathy [46]. Patients with clear clinical cases of cubital tunnel syndrome are more likely than carpal tunnel syndrome patients to have normal electrodiagnostic tests [46]. Patients can have conduction studies consistent with a diagnosis of cubital tunnel syndrome despite not exhibiting symptoms [46]. The results of electrodiagnostic testing alone cannot determine if a patient is a candidate for surgery [46].

There is no perfect gold standard for the diagnosis of compression neuropathy [89]. For carpal tunnel syndrome, a combination of positive electrodiagnostic findings, clinical symptoms, and positive clinical testing is believed to be the most accurate diagnostic method [89]. Reported sensitivities for Tinel’s test in carpal tunnel syndrome range from 45% to 75% [89]. Reported sensitivities for wrist flexion/compression test in carpal tunnel syndrome range from 49% to 89% [89]. Reported sensitivities for Tinel’s test in cubital tunnel syndrome are 70% [89]. Reported sensitivities for elbow flexion/compression test in cubital tunnel syndrome are 91% [89]. False-positive rates of 20% to 30% have been reported for provocative tests in asymptomatic individuals [89]. The diagnostic value of provocative clinical tests in ulnar neuropathy at the elbow is marginal [86]. Nearly forty percent of patients with a provisional diagnosis of cubital tunnel syndrome had either another nerve pathology or a normal test [80].

Ultrasound examination can be challenging for median nerve compression in the forearm, as findings may not lead to diagnosis because compression is often mild and may not produce positive ultrasound findings [53]. Expert consensus on best practice for the clinical use of ultrasound reference values for upper extremity neuropathy evaluation is lacking [13]. The diagnosis and treatment of compressive neuropathies are shifting towards preoperative imaging with ultrasound and MRN [9]. A finding of a positive Tinel sign over peripheral nerves in a patient with symptoms of nerve compression can be accepted as a legitimate physical finding [47]. Some abnormalities considerably modify or influence the clinical presentation of nerve entrapment and necessitate a specific treatment [52]. Physicians treating peripheral nerve disorders in individuals from endemic regions should consider leprosy when confronted with a mass in or near the ulnar nerve associated with peripheral neuropathy [54].

Classification and Severity

McGowan proposed a three-grade classification system for ulnar nerve function in 1950 [33]. Grade I: Minimal lesions characterized by symptoms of paresthesias and numbness but no weakness [33]. Grade II: Intermediate lesions characterized by wasting of the interosseous muscles [33]. Grade III: Severe lesions characterized by complete intrinsic muscle paralysis [33]. The difference between Grade II and Grade III ulnar nerve lesions is based solely on the degree of muscle weakness [33]. McGowan’s system is essentially a preoperative rating of intrinsic muscle function [33]. There is no consensus on any scoring system for ulnar neuropathy, as available systems either rate subjective symptoms that are difficult to quantify or fail to compare preoperative and postoperative conditions [33]. More pronounced ulnar nerve thickening at the time of diagnosis is associated with poor outcome at follow-up, especially in conservatively treated cases [24]. Electrodiagnostic signs of demyelination on testing indicate favorable outcome for ulnar neuropathy at the elbow [24].

Investigations

Clinical Assessment and Differential Diagnosis

A broad spectrum of histopathology may mimic nerve compression syndromes, requiring the inclusion of tumours and tumour-like lesions in the differential diagnosis [31]. Prior to committing an individual to surgery for entrapment neuropathy, careful history, detailed examination, and adequate testing should be carried out to ascertain that there are no non-compressive etiologies for the presentation [39]. The clinical presentation of demyelinating focal motor neuropathy of the ulnar nerve can masquerade as compression in Guyon's canal, demonstrating the importance of establishing an accurate diagnosis before recommending surgery [16].

Nerve compression syndromes are more frequent in the upper extremity than the lower limb because of its increased mobility [22]. Nerve compression injuries are due to both static factors, such as anatomical components like unyielding tunnels or musculotendinous anomalies, and dynamic factors, including mobility, muscle contraction, and nerve mobility during repetitive movements [22]. Ulnar and radial neuropathies were less common than median neuropathies, with ulnar neuropathies more frequent in men and radial neuropathies being rare [34]. The clinician should consider double crush syndrome even with normal electrodiagnostic and two-point discrimination findings, evaluating all potential sites of entrapment along the nerve course [22]. Evaluation for one site of compressive neuropathy of the median nerve should always include other potential sites, such as differentiating between carpal tunnel syndrome and pronator syndrome [29]. The possibility of Calcific Neuritis should be strongly considered whenever a peripheral nerve becomes acutely swollen, tender, or visible on radiology [97, 98].

Electrodiagnostic Studies

Electromyography and nerve conduction velocity studies should be performed if any question about neurologic dysfunction exists during the evaluation of the elbow [99]. Precise localization of the ulnar nerve below and above the elbow with submaximal stimulations improves accuracy of the distance measurement [66].

Imaging Modalities

The diagnosis and treatment of compressive neuropathies continue to evolve with technology, shifting towards preoperative imaging with ultrasound and MRN [9]. High-resolution ultrasound should be part of the initial evaluation of ulnar neuropathy at the elbow in order to assess the etiology of the conflict [144]. Expert consensus on best practice for the clinical use of ultrasound for upper extremity neuropathy evaluation is lacking and should be a logical next step in its deployment [13]. US examination can be challenging and its findings may not lead to diagnosis of lateral synovial plica syndrome, as median nerve compression in the forearm is often mild and may not produce positive US findings [53]. As ganglia are often not palpable, ultrasonography and magnetic resonance imaging are recommended for accurate diagnosis of recurrent cubital tunnel syndrome caused by ganglion [115].

MRI is a useful diagnostic modality for confirming nerve compression, assessing space-occupying lesions, and excluding other pathologies in athletes with entrapment neuropathies of the shoulder and elbow [120]. As schwannomas may be multiple without clinical symptoms, MR imaging of the entire limb is recommended when schwannomas occur in a major nerve in the upper extremity [121]. MRI can be used to evaluate ligaments and tendons in the elbow, but it is rarely indicated [99].

Plain radiographs remain the hallmark and the best screening test for the evaluation of the elbow [48]. CT is helpful when assessing for malunion architecture and the location and pattern of osteophytes and/or loose bodies, and three-dimensional CT is used to check for heterotopic ossification [99].

Early diagnosis, careful preoperative imaging assessment, and complete decompression can be expected to result in favorable rehabilitation outcomes for ulnar nerve double crush by entrapment of a peri-cubital tunnel ganglion cyst and cubital tunnel [114]. Early diagnosis, careful preoperative imaging assessment, and full decompression can be expected to receive a good rehabilitation for cubital tunnel syndrome caused by intraneural ganglion cyst of the ulnar nerve at the elbow [129].

Treatment

Non-Operative

Conservative management remains the first-line approach for many neuropathies. Patients with mild or moderate cubital tunnel syndrome have a good likelihood of symptom reduction or recovery without surgical treatment [116]. For snapping of the medial head of the triceps, a trial of nonoperative therapy may eliminate presenting symptoms; this regimen includes avoidance of exacerbating activities, a course of nonsteroidal antiinflammatory agents, and splinting of the elbow in approximately 70° of flexion [143]. The majority of compression neuropathies in cyclists resolve after appropriate rest and conservative treatment [127]. Similarly, treatment for radial nerve palsy is usually non-operative with satisfactory results [43]. In the forearm, surgical decompression of the median nerve or the anterior interosseous nerve is rarely indicated, and a prolonged nonsurgical approach is warranted in most cases [61].

Guidelines support initial conservative care for carpal tunnel syndrome. The American Academy of Neurology’s 1993 practice guidelines recommended treating carpal tunnel syndrome with noninvasive options first and considering surgery only if noninvasive treatment proved ineffective [149]. The AAOS guideline recommends both nonsurgical and surgical treatments for early carpal tunnel syndrome without denervation, while also recommending an initial course of nonoperative treatment [149]. Chitosan phonophoresis demonstrated significant improvements in nerve conduction, pain reduction, and enhancement of hand function for mild to moderate cubital tunnel syndrome [117]. In pediatric and adolescent patients, non-operative treatment of cubital tunnel syndrome is unlikely to resolve symptoms [123]; however, a trial of conservative care remains appropriate for most of these patients, even though nonsurgical treatment is unlikely to relieve symptoms [126].

Operative

Indications: Surgical intervention for cubital tunnel syndrome is indicated when nonoperative treatment, including activity modification, does not relieve symptoms [139]. Surgery is usually indicated for compressive ulnar neuropathies at the elbow if symptoms persist or muscle weakness develops [2]. For radial nerve palsy, surgery is indicated in cases of nerve transection or lack of improvement after conservative treatment [43]. Surgical decompression is indicated for ulnar neuropathy in cyclists if symptoms persist after conservative treatment [127]. Neuropathy symptoms following shoulder surgery were often refractory to conservative management [1]. The majority of patients with musculocutaneous nerve entrapment required surgical decompression, although some responded to nonoperative therapy [133]. Surgery on neural structures compromised by neuromas, neuroma-in-continuity, or compression is indicated if symptoms persist after nonoperative modalities [96].

Surgical Approach / Technique: Surgical decompression of median and ulnar neuropathies following shoulder surgery led to nearly 90% symptom resolution [1]. Decompression of the posterior interosseous nerve resulted in good outcomes for the majority of patients [15]. Endoscopic management of cubital tunnel syndrome yielded 97% good and excellent results in patients with moderate symptoms and 89% good and excellent results in patients with severe symptoms [27]. Surgery was effective in treating cubital tunnel syndrome, with more than 90% of patients cured or showing improvement [100]. No surgical treatment procedure has shown superiority over another for recalcitrant cubital tunnel syndrome, though individualized treatment is emphasized to improve symptoms and maximize nerve recovery potential [20]. Cross-palm nerve grafting may be a useful adjunct to enhance sensory recovery in severe ulnar neuropathy [106]. Relief of pain and paresthesias were the most consistent favorable results following subcutaneous anterior transposition of the ulnar nerve for failed decompression of cubital tunnel syndrome [119].

For carpal tunnel syndrome associated with vasospasm, all patients treated surgically had an excellent result regarding carpal-tunnel symptoms [145], whereas only three of the conservatively treated patients showed improvement [145].

Neural Injury and Complex Regional Pain Syndrome: Surgical options for neural injury in complex regional pain syndrome include neurolysis, neurorrhaphy, or neural relocation [96]. Modification of the neural bed is an option for treating neural injury in complex regional pain syndrome [96]. For complete nerve transection or neuroma-in-continuity, tension on the repair site should be avoided by performing nerve grafts from the sural nerve or a branch of the medial or lateral antebrachial cutaneous nerve [96]. Adhesions between the skin and nerve should be managed by Z-plasty local flaps or distant flaps [96]. If excessive scarring or adhesions develop, the neural bed should be modified using autologous fat, rotational muscle flaps, pedicled muscle or fascial flaps, free muscle transfer, autologous or allograft venous wraps, or nerve conduits [96]. Internal neurolysis should be minimized during surgery for neural injury in complex regional pain syndrome [96].

Postoperative Care and Rehabilitation: Postoperative care for neural injury in complex regional pain syndrome should include sympatholytic intervention, pharmacologic palliation, physical therapy, and early active and passive range of motion [96]. Hemostasis must be established to prevent hematoma formation during surgery for neural injury in complex regional pain syndrome [96]. Constrictive postoperative dressings should be avoided during surgery for neural injury in complex regional pain syndrome [96].

Compression Neuropathy in Complex Regional Pain Syndrome: For compression neuropathy in complex regional pain syndrome, the location of the compression must be confirmed by peripheral nerve conduction velocities or interstitial pressure measurements if symptoms justify intervention [96]. Complete release of the involved nerve is important for treating compression neuropathy in complex regional pain syndrome [96]. If the neural bed is damaged or compromised during treatment of compression neuropathy in complex regional pain syndrome, modification of the neural environment is appropriate [96]. Patients undergoing surgery for compression neuropathy in complex regional pain syndrome should expect prolonged rehabilitation, continued use of oral nonnarcotic agents for 3 to 6 months, and some residual disability [96]. Surgical release of intrinsic muscles by myotomy or tenotomy about the MCP or PIP joints decreases stiffness but does not restore full range of motion, with an average improvement of 50% [96].

Indications and Decision-Making

The choice of surgical procedure for compressive ulnar neuropathies at the elbow depends on the severity of the neuropathy and patient factors [2]. Early diagnosis and treatment are essential to maintain joint function and avoid neuropathy in cases of pigmented villonodular synovitis of the elbow [12]. The clinical presentation of a demyelinating focal motor neuropathy of the ulnar nerve masquerading as compression in Guyon's canal demonstrates the importance of establishing an accurate diagnosis before recommending surgery [16]. Initial evaluation of nerve compression involves determining longevity and severity of symptoms prior to proceeding down a treatment path [42]. The surgeon must differentiate between a transient onset of symptoms affecting a normal nerve and a nerve with altered physiology resulting from chronic compression [42]. A nerve with altered physiology from chronic compression may return to its baseline condition once the offending agent is removed yet remain physiologically abnormal and susceptible to subsequent pressure changes [42]. A murine model study demonstrated evidence of irreversible physiologic changes seen after late decompression (at six weeks) but not after early decompression (at two weeks) [42].

A comprehensive and individualized treatment plan is crucial for optimizing patient outcomes with painful neuromas [107]. The goals for treating surgeons in peripheral nerve injuries are to accurately describe the injury, make a best available assessment as to the likelihood of improvement without intervention, and choose the optimal intervention at the earliest time point when clarity is available [76]. Options for treatment of peripheral nerve injuries include direct repair, single or cabled autografts, allografts, conduit-assisted repairs, nerve transfers, and tendon- and muscle-based salvage options [76]. Suboptimal treatment of peripheral nerve injuries can leave devastating consequences due to pain and dysfunction [76]. 24% to 41% of patients with a major peripheral nerve injury are unable to return to their previous line of work [76]. Over one million people worldwide present with a peripheral nerve injury every year [76]. There remains a lack of consensus on optimal treatment strategies for many clinical scenarios of peripheral nerve injuries [76].

Orthopaedic treatment strategies for neuromuscular diseases will likely change in the future as a result of pharmacologic alteration of the natural history [79]. The orthopaedic approach to patients with neuromuscular diseases requires careful timing of surgical and supportive interventions placed in context of the patient’s overall function and point in time of recovery [79]. An interdisciplinary approach with regular longitudinal follow-ups is recommended for patients with neuromuscular diseases to provide improved day-to-day satisfaction alongside optimal clinical outcomes [79]. Many orthopaedic treatments available for neuromuscular disorders treat symptoms of the disease, and awareness of the overall prognosis and natural history is important to devise an appropriate treatment plan [79].

Complications

Iatrogenic Injury and Anatomical Risk: Prevention of complications in compressive neuropathy management relies on a solid understanding of normal anatomy and anatomic variations [6]. Specific complications of ulnar nerve release include persistent dysaesthesia, reflex sympathetic dystrophy, haematoma, infection, neuroma of the medial brachial and medial antebrachial cutaneous nerves, persistent sensory deficit, and persistent weakness [70]. Medial epicondylectomy carries a risk of damage to medial collateral ligaments [70].

Treatment Failure and Recurrence: Recurrences of cubital tunnel syndrome are not rare and can occur after any surgical procedure, even after many years [162]. In a cohort of patients with persistent or recurrent cubital tunnel syndrome, 24 patients had muscle weakness prior to revision surgery [64]. Patients with recalcitrant ulnar tunnel syndrome treated with a local adipofascial flap showed variable residual neuropathy [7].

Psychosocial Factors and Patient Dissatisfaction: Dissatisfaction and disability after surgery in patients with advanced ulnar nerve neuropathy may stem from problems with coping or mood disturbances [157]. Depression was found to be the dominant predictor of both patient dissatisfaction and disability in patients who underwent carpal tunnel release [157]. Patients with concomitant pain syndromes or mood disorders rated the result of endoscopic carpal tunnel release less satisfactory [157]. Dissatisfaction after surgery for persistent or recurrent ulnar neuropathy may be inappropriately ascribed to technical shortcomings [157].

Other Considerations: Complications of compressive neuropathy management include iatrogenic injury, treatment failure, and pathologic pain syndromes [6]. Static numbness, weakness, and atrophy may be permanent, and incomplete understanding of this may lead to dissatisfaction and additional treatment [157]. A perceived response to treatment for persistent or recurrent ulnar neuropathy may be the placebo effect, self-limiting course of the disease, or regression to the mean [157]. Upper-extremity neuropathy can develop following nonupper extremity surgeries, particularly anterior cervical discectomy and fusion [38]. Critical illness polyneuropathies and myopathies are common complications of critical illness, summarized under the term intensive care unit-acquired weakness [136]. Neuropathy is present in a substantial number of diabetic patients, with around 10% having some degree of neuropathy at the time of diagnosis [28]. 40% of diabetic patients develop neuropathy within 10 years of diagnosis [28]. Elderly patients with diabetes have a higher prevalence of neuropathy [28]. Sustained hyperglycemia leads to the formation of advanced glycation end products, which cause direct neuronal injury and microvascular damage [28].

Recovery

Functional milestones: Patient-reported outcomes following simple decompression for ulnar neuropathy at the elbow continue to improve and reach a plateau at 3 months [62]. In contrast, measured strength and sensory recovery after this procedure continue over 12 months [62]. Nerve-conduction studies serve as a prognostic factor for carpal tunnel syndrome, where patients with motor abnormalities appear to have more favorable results than those with only sensory abnormalities [23]. Electrodiagnostic signs of demyelination on testing indicate a favorable outcome for ulnar neuropathy at the elbow [24].

Other Considerations: Poor outcomes in the surgical treatment of non-traumatic cubital tunnel syndrome are mainly related to the severity of the neuropathy according to the clinical stage, specifically the McGowan/Goldberg (McGG) classification [26]. In endoscopic management of cubital tunnel syndrome, the group with moderate symptoms had 97% good and excellent results [27], while the group with severe symptoms had 89% good and excellent results [27]. Patients with severe intrinsic muscle atrophy and absent motor and sensory nerve conduction velocities can expect satisfactory long-term functional results after surgery for severe cubital tunnel syndrome [125]. Decompression of the posterior interosseous nerve resulted in good outcomes for the majority of patients, with preoperative symptoms and observations at surgery related to the results [15].

Conservative management with a drop-out splint for ulnar nerve entrapment at the elbow resulted in complete resolution of symptoms in 24% of patients [41], while 24% subsequently required surgical decompression of the nerve [41]. Patients with cubital tunnel syndrome treated with a local adipofascial flap showed significant improvement in subjective and objective symptoms, with variable residual neuropathy [7]. Patients with combined nerve compressions follow similar trajectories in the postoperative period as those with isolated cubital tunnel syndrome [179].

Specific case series report varied recovery timelines. In a case of cubital tunnel syndrome associated with previous ganglion cyst excision, symptoms including sensory dysfunction and weakness improved over the 1-year follow-up period [59]. In a case of ulnar nerve compression in Guyon’s canal due to a haemangioma, nerve conduction velocity and distal latency to the first dorsal interosseus muscle returned to normal [190]. For a patient in long-term haemodialysis with cubital tunnel syndrome, immediate relief of paraesthesia and pain in the right hand occurred after surgery [192]; however, 8 months after operation, some numbness was present and muscular atrophy was unchanged, though the patient had recovered partial use of his hand [192]. The delayed neuropathy of the ulnar nerve in pediatric patients associated with elbow dislocation appears to be associated with a complete recovery, as long as it is promptly treated [63]. Despite early release of constriction bands in congenital constriction band syndrome causing ulnar nerve palsy, the ulnar nerve palsies persisted for a mean follow-up period of 7 years [132].

Key Evidence

• [L4] Neuropathy symptoms were often refractory to conservative management, while surgical decompression led to nearly 90% symptom resolution. [1] (10.1016/j.jseint.2024.05.011)
• [L5] If symptoms persist or muscle weakness develops, surgery is usually indicated, with the choice of procedure depending on the severity of the neuropathy and patient factors. [2] (10.5435/00124635-199809000-00004)
• [L5] The authors emphasize the need for clear definitions of recurrence versus persistent compression neuropathy, agreements on supplementary diagnostics, and standardized outcome measurements to enable comparing results from different techniques and clinics. [3] (10.1177/17531934241311822)
• [L5] Peripheral nerve injuries can dramatically affect a patient's life. [4] (10.1016/j.hcl.2015.01.007)
• [L5] Diagnosis of compressive neuropathies relies on a combination of clinical presentation, physical examination findings, and use of imaging modalities and electrodiagnostic studies, as there is no true diagnostic gold standard for most conditions. [5] (10.1016/j.jhsg.2022.10.010)
• [L5] Complications of compressive neuropathy management include iatrogenic injury, treatment failure, and pathologic pain syndromes, with prevention relying on a solid understanding of normal anatomy and anatomic variations. [6] (10.1016/j.hcl.2015.01.012)
• [L4] Patients showed significant improvement in subjective and objective symptoms, with variable residual neuropathy. [7] (10.1016/j.hansur.2021.03.010)
• [L3] The demographics of patients with various compressive neuropathies were not homogeneous, suggesting different etiologies. [8] (10.1177/15589447221107701)
• [L5] The diagnosis and treatment of compressive neuropathies continue to evolve with technology, shifting towards preoperative imaging with ultrasound and MRN, while the management of failed decompressions remains challenging. [9] (10.1016/j.jhsg.2022.10.009)
• [L5] Early diagnosis and treatment are essential to maintain joint function and avoid neuropathy. [12] (10.1016/j.jse.2005.08.015)
• [Paper] Expert consensus on best practice for the clinical use of these reference is lacking and should be a logical next step in the deployment of ultrasound for upper extremity neuropathy evaluation. [13] (10.2106/jbjs.rvw.24.00099)
• [L4] Dynamic compressive neuropathies around the elbow are rare entities that present unique diagnostic challenges, often requiring dynamic nerve conduction studies for diagnosis. [14] (10.1177/2325967118807131)
• [L4] Decompression of the nerve resulted in good outcomes for the majority of patients, with preoperative symptoms and observations at surgery related to the results. [15] (10.3109/ort.1979.50.suppl-174.01)
• [L5] The clinical presentation of the patient's condition shows the importance of establishing an accurate diagnosis before recommending surgery for what may appear to be a compressive neuropathy. [16] (10.1053/jhsu.2003.50015)
• [L5] Nontraumatic neuropathies of the upper limb are rare in children, and high-quality evidence regarding diagnostics and treatment remains limited. [19] (10.1016/j.jhsa.2020.04.028)
• [L5] No surgical treatment procedure has shown superiority over another; however, individualized treatment is emphasized to improve symptoms and maximize nerve recovery potential. [20] (10.5435/jaaos-d-20-01381)
• [L5] The basic pathophysiology of nerve compression injury is complex and multifactorial, involving changes in intraneural circulation and nerve fiber structure. [21] (10.1016/s0749-0712(21)00589-8)
• [Paper] [22] (10.1016/s0894-1130(02)80011-4)
• [L4] Nerve-conduction studies can be used as a prognostic factor, with patients having motor abnormalities appearing to have more favorable results than those with only sensory abnormalities. [23] (10.2106/00004623-197961010-00017)
• [L2] More pronounced ulnar nerve thickening at the time of the diagnosis is associated with poor outcome at follow-up, especially in conservatively treated cases, while electrodiagnostic signs of demyelination on testing indicate favorable outcome. [24] (10.1212/01.wnl.0000142535.24626.90)
• [L4] The study supports the hypothesis that poor outcomes are mainly related to the severity of the neuropathy according to the clinical stage, specifically the McGowan/Goldberg (McGG) classification. [26] (10.1016/j.hansur.2021.10.030)
• [L4] The group with moderate symptoms had 97% good and excellent results, while the group with severe symptoms had 89% good and excellent results, contradicting the view that transposition is necessary for advanced neuropathies. [27] (10.1016/j.jhsb.2005.08.008)
• [L5] The differentiating features between carpal tunnel syndrome and pronator syndrome should be understood, and evaluation for one site of compressive neuropathy of the median nerve always should include the other potential sites. [29] (10.1016/s0278-5919(05)70267-2)
• [L4] The case demonstrates that patients presenting with median nerve symptoms must be assessed both at the wrist and proximally to exclude compression elsewhere. [30] (10.1111/j.1758-5740.2010.00051.x)
• [Paper] A broad spectrum of histopathology may mimic nerve compression syndromes, and the surgeon should include in the differential diagnosis of nerve compression the unusual cause of tumours and tumour-like lesions. [31] (10.1177/175319340703201s08)
• [L4] Nonsurgical treatment is successful in most patients with mild nerve dysfunction. [32] (10.5435/jaaos-d-15-00261)
• [L5] [33] (10.5435/00124635-199809000-00003)
• [L3] Ulnar and radial neuropathies were less common, with ulnar neuropathies more frequent in men and radial neuropathies being rare. [34] (10.1177/1753193419886741)
• [L4] [37] (10.3389/fsurg.2018.00048)
• [L3] Upper-extremity neuropathy can develop following nonupper extremity surgeries, particularly ACDF. [38] (10.1016/j.jhsg.2026.100972)
• [L5] Prior to committing an individual to surgery for entrapment neuropathy, careful history, detailed examination, and adequate testing should be carried out to ascertain that there are no non-compressive etiologies for the presentation, some of which may be adversely affected by surgery. [39] (10.1177/1558944719898801)
• [L4] [40] (10.1016/0363-5023(92)90366-w)
• [L4] Of these patients, 24% demonstrated complete resolution of their symptoms, whereas another 24% of the patients subsequently required surgical decompression of the nerve. [41] (10.1016/s0894-1130(12)80378-4)
• [L5] [42] (10.2106/jbjs.n.00213)
• [L5] Treatment is usually non-operative with satisfactory results, though surgery is indicated for nerve transection or lack of improvement after conservative treatment. [43] (10.1302/2058-5241.1.000028)
• [Paper] Cubital tunnel syndrome is the second most common nerve compression syndrome in the upper limb, with paresthesia and weakness being the most common presentations. [44] (10.1142/s2424835520400032)
• [L5] Electrodiagnostic studies, when used in combination with clinical findings, can improve diagnostic reliability significantly for compressive neuropathies. [45] (10.1016/s0749-0712(21)00305-x)
• [Paper] [46] (10.1197/j.jht.2006.02.003)
• [L5] Therefore one may conclude that finding a positive Tinel sign over these peripheral nerves in the patient with symptoms of nerve compression can be accepted as a legitimate physical finding. [47] (10.1016/s0363-5023(03)00374-5)
• [L4] Patients with cubital tunnel syndrome are more likely to present with muscle atrophy, reflecting advanced nerve damage that may not respond to surgery. [49] (10.1016/j.jhsa.2007.03.009)
• [L3] A diagnosis of ulnar nerve compression merits a comprehensive workup by the treating surgeon and a high suspicion for concomitant median nerve compression. [50] (10.1177/1558944718813669)
• [L5] Ulnar nerve entrapment is the second most common nerve entrapment syndrome of the upper extremity, most commonly occurring in the cubital tunnel. [51] (10.5435/00124635-200711000-00006)
• [Paper] Nevertheless, a few abnormalities considerably modify or influence the clinical presentation of nerve entrapmen and necessitate a specific treatment. [52] (10.1016/j.main.2004.10.011)
• [L5] US examination can be challenging and its findings may not lead to diagnosis of LS, as median nerve compression in the forearm is often mild and may not produce positive US findings. [53] (10.1177/17531934251370272)
• [Case_report] Physicians treating peripheral nerve disorders in individuals from endemic regions should consider leprosy when confronted with a mass in or near the ulnar nerve associated with peripheral neuropathy. [54] (10.2106/00004623-197961040-00028)
• [L5] [57] (10.1258/ht.2011.011007)
• [L3] [58] (10.1227/neu.0b013e3182846dbd)
• [Case_report] The patient's symptoms including sensory dysfunction and weakness improved over the 1-year follow-up period. [59] (10.5397/cise.2022.01102)
• [L4] Current evidence suggests that different surgical methods to treat ulnar neuropathy at the elbow do not differ in their clinical outcomes. [60] (10.1016/j.hcl.2013.04.013)
• [L5] Surgical decompression of the median nerve or the AIN in the forearm is rarely indicated; a prolonged nonsurgical approach is warranted in most cases. [61] (10.5435/jaaos-d-16-00010)
• [L4] Improvement in patient-reported outcomes continued and reached a plateau at 3 months, whereas measured strength and sensory recovery continued over 12 months. [62] (10.1097/prs.0b013e318282764f)
• [L4] The delayed neuropathy of the ulnar nerve appears to be associated with a complete recovery in children, as long as it is promptly treated. [63] (10.1016/j.jse.2012.11.009)
• [L4] [64] (10.1177/1753193417729602)
• [L5] Precise localization of the ulnar nerve below and above the elbow with submaximal stimulations improves accuracy of the distance measurement. [66] (10.1016/j.pmr.2012.08.019)
• [L5] [69] (10.1016/j.hcl.2007.05.002)
• [L5] [70] (10.1136/pgmj.2006.047456)
• [L5] Compression neuropathies are a significant source of pain in the upper extremity. [77] (10.1016/s0749-0712(21)00355-3)
• [L4] Nearly forty percent of patients with a provisional diagnosis of CubTS had either another nerve pathology or a normal test. [80] (10.1016/j.jse.2020.01.064)
• [L5] It classically presents with arm and hand pain and associated sensory and motor dysfunction, making it a common cause of upper-extremity pain. [81] (10.1016/s0749-0712(21)00356-5)
• [L2] [86] (10.1136/jnnp.2009.180844)
• [L2] [89] (10.1016/j.jhsa.2008.05.022)
• [L5] The possibility of Calcific Neuritis should be strongly considered whenever a peripheral nerve becomes acutely swollen, tender or visible on radiology. [97] (10.1016/0266-7681(86)90033-1)
• [L5] The possibility of Calcific Neuritis should be strongly considered whenever a peripheral nerve becomes acutely swollen, tender or visible on radiology. [98] (10.1016/0266-7681_86_90033-1)
• [L4] Surgery was effective in treating cubital tunnel syndrome with more than 90% of patients cured or showing improvement. [100] (10.1016/j.otsr.2014.03.009)
• [L4] Cross-palm nerve grafting may be a useful adjunct to enhance sensory recovery in severe ulnar neuropathy. [106] (10.1177/1558944718822851)
• [L5] A comprehensive and individualized treatment plan is crucial for optimizing patient outcomes with painful neuromas. [107] (10.5435/jaaos-d-24-00581)
• [L3] A standardized assessment protocol for ulnar neuropathy is required for future comparison trials. [110] (10.1016/j.jhsa.2009.05.010)
• [Case_report] Early diagnosis, careful preoperative imaging assessment, and complete decompression can be expected to result in favorable rehabilitation outcomes. [114] (10.1186/s12891-025-08526-x)
• [L4] As ganglia are often not palpable, ultrasonography and magnetic resonance imaging are recommended for accurate diagnosis. [115] (10.1142/s2424835518500224)
• [L2] [116] (10.1177/1753193408098480)
• [L1] This approach demonstrated significant improvements in nerve conduction, pain reduction, and enhancement of hand function. [117] (10.1016/j.jht.2024.02.006)
• [L4] Relief of pain and paresthesias were the most consistent favorable results. [119] (10.1053/jhsu.2000.6005)
• [Paper] MRI is a useful diagnostic modality for confirming nerve compression, assessing space-occupying lesions, and excluding other pathologies in athletes with entrapment neuropathies of the shoulder and elbow. [120] (10.1016/j.csm.2006.03.005)
• [L5] As schwannomas may be multiple without clinical symptoms, we recommend MR imaging of the entire limb when schwannomas occur in a major nerve in the upper extremity. [121] (10.1016/s0266-7681(97)80371-3)
• [L4] Non-operative treatment of cubital tunnel syndrome in pediatric and adolescent patients is unlikely to resolve symptoms. [123] (10.1016/s0363-5023(11)60063-4)
• [L4] Patients with severe intrinsic muscle atrophy and absent motor and sensory nerve conduction velocities can expect satisfactory long-term functional results after surgery. [125] (10.1016/j.jhsa.2004.01.010)
• [L3] Although nonsurgical treatment is unlikely to relieve symptoms, a trial of conservative care remains appropriate for most patients, with surgery effective if nonsurgical care fails. [126] (10.1016/j.jhsa.2012.01.016)
• [L5] The majority of compression neuropathies in cyclists resolve after appropriate rest and conservative treatment; however, should symptoms persist, nerve decompression may be indicated. [127] (10.1016/j.hcl.2016.08.015)
• [L5] The ulnar nerve requires over 2 cm of unimpeded movement both at the elbow and wrist to perform full motions of the upper extremity involving the shoulder, elbow, wrist, and fingers. [128] (10.1053/jhsu.2001.26140)
• [L5] Therefore, early diagnosis, careful preoperative imaging assessment and full decompression can be expected to receive a good rehabilitation. [129] (10.1186/s12883-018-1229-7)
• [L4] Despite early release of the constriction bands, the ulnar nerve palsies persisted for a mean follow-up period of 7 years. [132] (10.1053/jhsu.2001.24130)
• [L4] While some patients respond to nonoperative therapy, the majority in this series required surgical decompression. [133] (10.1016/s1058-2746(98)90053-2)
• [L5] Maximum strains in the ulnar nerve occurred at maximum elbow flexion and directly behind the medial epicondyle, with a wide range of maximal strains (0% to 14%) found. [135] (10.1016/s0363-5023(98)80005-1)
• [L5] Critical illness polyneuropathies (CIP) and myopathies (CIM) are common complications of critical illness, summarized under the term intensive care unit-acquired weakness (ICUAW). [136] (10.1152/physrev.00028.2014)
• [L5] Tearing of the UCL significantly increased elbow valgus laxity, which in turn elongated the ulnar nerve during simulated throwing motion. [138] (10.1016/j.jse.2019.02.009)
• [L5] Surgical intervention is indicated when nonoperative treatment, including activity modification, does not relieve the symptoms. [139] (10.1016/j.ocl.2012.07.017)
• [L4] Ulnar tunnel syndrome is of two distinct types: Type 1 involves compression at the level of the pisiform with sensory and motor involvement, and Type 2 involves compression distal to the pisiform with motor involvement only. [140] (10.1016/0266-7681(84)90021-4)
• [L5] [143] (10.1097/00130911-200206000-00008)
• [L3] High-resolution ultrasound should be part of the initial evaluation of ulnar neuropathy at the elbow in order to assess the etiology of the conflict. [144] (10.1016/j.ejrad.2017.08.003)
• [L4] All patients treated surgically had an excellent result regarding carpal-tunnel symptoms, whereas only three of the conservatively treated group showed improvement. [145] (10.2106/00004623-196749060-00011)
• [L1] [149] (10.2147/ijgm.s7682)
• [L4] In stage IV disease the pressure increased in elbow extension and in elbow flexion. [151] (10.1016/j.jhsa.2006.01.009)
• [L4] The increased pressure in the cubital tunnel could still be important, as exposure to a lesser extraneural pressure by repetitive non-maximum elbow flexion might be more deleterious. [153] (10.3109/2000656x.2012.747962)
• [L5] Most nerve lesions sustained by athletes are best described as neuropraxias, which is the mildest form of nerve injury denoting a conduction block where all nerve elements remain in continuity. [154] (10.1016/s0278-5919(05)70256-8)
• [L4] To the best of our knowledge, this is the first study showing that shoulder position changes the ulnar nerve strain around the elbow in living patients with CubTS. [155] (10.1016/j.jse.2015.01.014)
• [L4] [157] (10.1016/j.jhsa.2011.11.024)
• [L3] Increased elbow flexion in patients with CuTS influences the intraneural blood flow of the ulnar nerve. [159] (10.1016/j.jhsa.2021.06.024)
• [Paper] [162] (10.1055/s-0031-1271800)
• [L4] Ulnar nerve gliding was most severe during passive wrist movement in elbow flexion and forearm supination. [163] (10.5397/cise.2024.00934)
• [L5] [168] (10.1302/2058-5241.6.200129)
• [L5] The throwing elbow is a common source of nerve injuries due to the unique combination of anatomy, high forces, and sheer repetition associated with throwing sports. [169] (10.1016/j.csm.2004.04.012)
• [L5] It is important to carefully trace the path of the ulnar nerve through imaging and physical examination when bony variants are present in the elbow joint. [170] (10.1142/s2424835518720232)
• [Paper] The cubital tunnel is clearly the focus of the problems facing the ulnar nerve at the elbow, and there are many factors that support this concept. [172] (10.1053/jhsu.1999.0898)
• [L5] Anterior transposition of the ulnar nerve at the elbow eliminates natural and pathological traction and compression forces, relieving the nerve of potential microcirculation compromise. [175] (10.1053/jhsu.1999.0886)
• [L4] Patients with combined nerve compressions follow similar trajectories in the postoperative period as those with isolated CuTS. [179] (10.1177/15589447211028921)
• [L5] The author contends that limiting elbow flexion to 90° in the Dellon et al. study was a serious error because maximal pressure in the cubital tunnel does not begin until after 90° flexion. [182] (10.1016/s0363-5023(96)80137-7)
• [L4] [185] (10.1016/s1058-2746(10)80005-9)
• [L5] [188] (10.1016/0266-7681(92)90106-c)
• [Paper] [189] (10.1197/j.jht.2005.02.010)
• [L5] Nerve conduction velocity and distal latency to the first dorsal interosseus muscle returned to normal. [190] (10.1016/s0266-7681(98)80185-x)
• [L5] The patient experienced immediate relief of paraesthesia and pain in the right hand after surgery. 8 months after operation some numbness was present and muscular atrophy was unchanged but he had recovered partial use of his hand. [192] (10.1016/0266-7681(94)90133-3)

See Also

• Cubital Tunnel Syndrome

References

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[24] Ulnar neuropathy at the elbow. Neurology. 2004. DOI: 10.1212/01.wnl.0000142535.24626.90

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