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This is the clinical evidence summary written for health professionals. It is technical, and it lists the research this page was built from. You do not need to read it to understand your treatment or to make a decision about it.

Overview¶

• Radial tunnel syndrome is relatively uncommon but is an important cause of lateral forearm pain [1].
• Clinical examination is a crucial part of the diagnosis of radial tunnel syndrome [1].
• The duration of symptoms averaged 2.3 years before a definitive diagnosis of radial tunnel syndrome was made [2].
• The diagnosis of radial tunnel syndrome remains clinical [5].
• Adherence to a defined protocol is useful in diagnosing radial tunnel syndrome [5].
• The issue surrounding radial tunnel syndrome traditionally has been properly identifying it clinically [7].
• Compression of the radial nerve at the elbow is of moderate frequency compared to the ulnar tunnel syndrome [9].
• A case of bilateral radial tunnel syndrome with signs discordant with traditionally used clinical diagnostic tests was successfully relieved with surgical decompression [6].
• The Rule-of-Nine test effectively specifies the site of tenderness for the diagnosis of radial tunnel syndrome [11].

Anatomy & Pathophysiology¶

Clinical Presentation & Diagnostic Challenges¶

• Radial tunnel syndrome is a relatively uncommon but important cause of lateral forearm pain [1].
• Clinical examination is a crucial component of the diagnosis for radial tunnel syndrome [1].
• The average duration of symptoms before a definitive diagnosis of radial tunnel syndrome was 2.3 years [2].
• Prominent focal tenderness in the area of the radial tunnel is a principal diagnostic criterion for radial tunnel syndrome [20].
• In radial tunnel syndrome, symptoms do not occur in the distribution of the purportedly affected nerve, which distinguishes focal tenderness from a positive Phalen's test in carpal tunnel syndrome [20].
• Skeptics note that radial tunnel syndrome presents with normal neurologic function and no confirmatory electrodiagnostic evidence of nerve dysfunction, contrasting with other well-described entrapment neuropathies [20].

Etiology & Pathophysiology¶

• There is dispute over the etiology of radial tunnel syndrome, with some skeptics questioning its status as a viable entrapment neuropathy [20].
• The posterior interosseous nerve carries unmyelinated (group IV) afferent fibers from the wrist capsule and small myelinated (group IIA) afferent fibers from muscles along its distribution [20].
• Unmyelinated group IV fibers are associated with nociception and pain [20].
• The current best evidence for the conservative management of radial tunnel syndrome consists primarily of expert opinion and inferences from studies on other nerve compressions [3].

Relevant Elbow Anatomy¶

• The elbow is a trocho-ginglymoid joint consisting of medial and lateral articulations that afford bony stability [63].
• The ulnohumeral joint is formed by the articulation of the trochlea with the ulna within the greater sigmoid notch [63].
• The radiocapitellar joint is formed by the articulation of the capitellum and radial head [63].
• The radius is held in close approximation to the ulna at the proximal radioulnar joint by the annular ligament [63].
• The lateral epicondyle is the origin of the lateral extensor musculature [63].
• The radial nerve enters the interval between the brachialis and brachioradialis muscles in the proximal angle of the lateral approach to the elbow [66].
• The deep branch of the radial nerve enters the supinator muscle [66].
• The posterior interosseous nerve is located just superficial to the anterior joint capsule at the level of the radiocapitellar joint [75].
• At the level of the radial neck, the posterior interosseous nerve may come in direct contact with the joint capsule [75].
• Supination increases the linear distance between the posterior interosseous nerve and the radial head [107].

Classification¶

• Radial tunnel syndrome (RTS) and posterior interosseous nerve (PIN) compression are distinct entities with different clinical presentations but share identical potential sites of nerve interference [29].
• The author of [29] proposes unifying RTS and PIN compression as mild and severe forms of one disease to simplify nomenclature [29].
• The authors of [52] recommend viewing radial tunnel syndrome and posterior interosseous nerve syndrome as a single condition presenting along a spectrum of nerve entrapment [52].
• Radial tunnel syndrome is a pain syndrome caused by compression of the posterior interosseous nerve at the proximal forearm [22].
• The diagnosis of radial tunnel syndrome remains clinical, and adherence to a defined protocol is useful in diagnosing this condition [5].
• A differential latency of ≥0.30 ms was considered indicative of radial tunnel syndrome [16].
• Radial tunnel syndrome is an illness construct based on a speculative pathophysiology with no verifiable pathophysiology or accepted reference standard for diagnosis [14].
• Skeptics note that the signs and symptoms of RTS contrast from other well-described entrapment neuropathies in that there is prominent focal tenderness, normal neurologic function, and no confirmatory electrodiagnostic evidence of nerve dysfunction [20].
• Prominent focal tenderness in the area of the radial tunnel remains one of the principal diagnostic criteria for RTS [20].
• Focal tenderness at the radial tunnel in RTS differs from a positive Phalen's test in carpal tunnel syndrome in that the symptoms do not occur in the distribution of the purportedly affected nerve [20].
• There has been no randomized controlled trial that compares surgical with nonsurgical treatment or with a placebo for RTS [20].
• Skeptics of RTS point to the great variability of surgical results reported in the literature as one of the characteristics of placebo surgery [20].

Clinical Presentation¶

• Radial tunnel syndrome is a relatively uncommon cause of lateral forearm pain [1].
• Radial tunnel syndrome and posterior interosseous nerve compression are distinct entities with different clinical presentations [29].
• The author proposes unifying radial tunnel syndrome and posterior interosseous nerve compression as mild and severe forms of one disease to simplify nomenclature [29].
• The authors recommend viewing radial tunnel syndrome and posterior interosseous nerve syndrome as a single condition presenting along a spectrum of nerve entrapment [52].
• Prominent focal tenderness in the area of the radial tunnel is one of the principal diagnostic criteria for radial tunnel syndrome [20].
• In radial tunnel syndrome, symptoms do not occur in the distribution of the purportedly affected nerve, which differs from a positive Phalen's test in carpal tunnel syndrome [20].
• A diagnosis of radial tunnel syndrome should be considered in patients with forearm and wrist pain that has not responded to more conventional treatment [13].
• The diagnosis of radial tunnel syndrome remains clinical, and adherence to a defined protocol is useful in diagnosing the condition [5].
• The issue surrounding radial tunnel syndrome has traditionally been properly identifying it clinically [7].
• A case of bilateral radial tunnel syndrome presented with signs discordant with traditionally used clinical diagnostic tests [6].
• Muscle denervation edema or atrophy along the distribution of the posterior interosseous nerve is the most common MR finding in radial tunnel syndrome [32].
• A symptomatic double-level entrapment of the posterior interosseous branch of the radial nerve has been described [51].
• Compression of the radial nerve at the elbow is of moderate frequency compared to ulnar tunnel syndrome [9].
• The annual incidence rate of posterior interosseous nerve entrapment is estimated to be 0.03% [88].
• The most frequent location of radial nerve entrapment is around the elbow, specifically involving the posterior interosseous nerve branch [88].
• The radial tunnel spans 5 cm, extending from the humero-radial joint and running distally between the deep and superficial heads of the supinator [88].
• The radial tunnel is bounded laterally by extensor carpi radialis longus and extensor carpi radialis brevis muscles and medially by biceps tendon and the brachialis [88].
• The roof of the radial tunnel is formed by brachioradialis [88].
• The floor of the radial tunnel is the elbow-joint capsule [88].
• Potential sites of entrapment in the radial tunnel include capsular tissue of the radiocapitellar joint, hypertrophic crossing branches of leash of Henry, the leading proximal tendinous and medial edge of ECRB, the arcade of Frohse, and the distal border of the supinator between its two heads [88].
• The arcade of Frohse is noted to be the most common site of entrapment in the radial tunnel [88].
• Clinical criteria for radial tunnel syndrome include activity-related pain, maximal tenderness 3–5 cm distal to the lateral epicondyle, pain exacerbation with forearm supination, radiation to the dorsoradial aspect of the forearm, and a positive Lister test [81].
• A clinical diagnosis of radial tunnel syndrome requires 4 of 5 diagnostic signs and symptoms, with one being maximal tenderness 3–5 cm distal to the lateral epicondyle [81].
• Physical examination for radial tunnel syndrome includes wrist flexion and forearm pronation, the Rule of Nines test, and assessment of weakness and pain with resisted long finger extension [86].
• The history for radial tunnel syndrome includes extensor musculature "forearm aching" [86].

Investigations¶

Clinical Diagnosis¶

• A diagnosis of radial tunnel syndrome should always be born in mind when dealing with patients with forearm and wrist pain that has not responded to more conventional treatment [13].
• It is important to understand the anatomic course and distribution of the radial nerve in order to make an accurate diagnosis [24].

Electrodiagnostic Studies¶

Imaging¶

• Neuroimaging should be considered as a complementary diagnostic method in posterior interosseous neuropathy [132].
• Dynamic ultrasonographic assessment of changes in the AP diameter and CSA is an effective diagnostic tool for identifying radial tunnel syndrome [121].
• Ultrasonography, computed tomography, and magnetic resonance imaging revealed the location of the ganglion in every patient with radial nerve palsy caused by a ganglion [124].
• The authors acknowledge that their study does not establish diagnostic accuracy or a reference standard for radial tunnel syndrome [49].

Treatment¶

Non-Operative Management¶

• Current best evidence for the conservative management of radial tunnel syndrome consists primarily of expert opinion and inferences taken from studies on other nerve compressions and related syndromes [3].
• The effectiveness of conservative treatments for radial tunnel syndrome is unknown because, for most treatments, no studies are available [48].
• Prospective evaluation of a single corticosteroid injection demonstrated improvement in standardized outcomes measures of pain and function at one year in 75% of patients presenting with symptoms of radial tunnel syndrome [8].
• Nonsurgical management is first-line for radial tunnel syndrome [4].
• The two most common nerve entrapment disorders about the elbow, including radial tunnel, should be initially managed conservatively before considering surgical intervention [80].

Operative Management¶

• Surgical decompression remains a viable option for refractory cases of radial tunnel syndrome despite ongoing controversy regarding diagnosis and outcomes [4].
• There is a tendency that surgical decompression of the radial tunnel might be effective in patients with radial tunnel syndrome [48].
• The authors advocate for surgery in high radial nerve entrapment neuropathy cases resistant to conservative treatment, emphasizing the importance of dissecting the entire length of the fibrous tunnel [17].
• This study indicates that pain in patients with radial tunnel syndrome may be treated successfully by surgical decompression of the superficial branch of the radial nerve [104].
• The results of radial tunnel release have been sufficiently good thus far as to warrant some attention, with an overall significant improvement in 99 of 108 cases (91.7%) when combined with other series [19].
• Nineteen patients (20 extremities) felt satisfied and helped and believed they gained improved function because of surgical decompression of the radial tunnel [27].
• The authors believe that a high rate of morbidity is associated with both the disease and its treatment, suggesting that great caution has to be taken before performing radial tunnel release [26].
• The authors suggest that great caution be taken before performing radial tunnel release and strict adherence to the indications noted during the preoperative examination [50].

Evidence Limitations and Controversy¶

• There has been no randomized controlled trial that compares surgical with nonsurgical treatment or with a placebo for radial tunnel syndrome [20].
• Skeptics of radial tunnel syndrome point to the great variability of surgical results reported in the literature as one of the characteristics of placebo surgery [20].
• Although radial tunnel syndrome is classically described as a nerve compression and entrapment syndrome, there is dispute over its etiology [20].

Complications¶

• A high rate of morbidity is associated with both radial tunnel syndrome and its treatment [26].
• In a case of congenital compression of the radial nerve, the patient was followed for an additional 3 months without clinical improvement in radial nerve function [12].
• Nerve injury is an uncommon though troublesome complication of fractures or dislocations of the elbow [39].

Recovery¶

• A patient with congenital compression of the radial nerve was followed for an additional 3 months without clinical improvement in radial nerve function [12].
• In a patient with posterior interosseous-nerve syndrome secondary to rheumatoid synovitis where the duration of entrapment was more than two years, a tendon transfer was used as treatment [139].
• Isolated posterior interosseous nerve neurectomy has shown excellent clinical outcomes, with few patients experiencing recurrent pain at long-term follow-up [123].

Key Evidence¶

• [L5] Radial tunnel syndrome is relatively uncommon but is an important cause of lateral forearm pain, with clinical examination being a crucial part of the diagnosis. [1] (10.1197/j.jht.2006.02.005)
• [L4] The duration of symptoms averaged 2.3 years before a definitive diagnosis of radial tunnel syndrome was made. [2] (10.1016/s0363-5023(83)80201-9)
• [L5] Current best evidence for the conservative management of radial tunnel syndrome (RTS) consists primarily of expert opinion and inferences taken from studies on other nerve compressions and related syndromes. [3] (10.1197/j.jht.2006.02.020)
• [L4] The article reviews the anatomy, diagnosis, and treatment of radial tunnel syndrome, noting that while nonsurgical management is first-line, surgical decompression remains a viable option for refractory cases despite ongoing controversy regarding diagnosis and outcomes. [4] (10.5435/jaaos-d-23-00314)
• [L4] The diagnosis of radial tunnel syndrome remains clinical, and adherence to a defined protocol is useful in diagnosing this condition. [5] (10.1016/s0266-7681(98)80015-6)
• [L5] A case of bilateral radial tunnel syndrome with signs discordant with traditionally used clinical diagnostic tests was successfully relieved with surgical decompression. [6] (10.1177/15589447211029045)
• [L5] The issue surrounding radial tunnel syndrome traditionally has been properly identifying it clinically. [7] (10.1097/01.bth.0000231580.32406.71)
• [L4] Prospective evaluation of corticosteroid injection demonstrated improvement in standardized outcomes measures of pain and function at one year in 75% of patients presenting with symptoms of radial tunnel syndrome. [8] (10.1016/j.jhsa.2017.06.095)
• [Paper] Compression of the radial nerve at the elbow is of moderate frequency compared to the ulnar tunnel syndrome. [9] (10.1016/j.main.2004.10.006)
• [L4] The Rule-of-Nine test effectively specifies the site of tenderness for the diagnosis of radial tunnel syndrome. [11] (10.1177/230949900401200115)
• [L5] The patient was followed for an additional 3 months, without clinical improvement in radial nerve function. [12] (10.1016/s0363-5023(89)80099-1)
• [L4] A diagnosis of radial tunnel syndrome should always be born in mind when dealing with patients with forearm and wrist pain that has not responded to more conventional treatment. [13] (10.1016/s0266-7681(05)80152-4)
• [L5] Radial tunnel syndrome is an illness construct based on a speculative pathophysiology with no verifiable pathophysiology or accepted reference standard for diagnosis. [14] (10.1016/j.jhsa.2010.03.020)
• [L4] A differential latency of ≥0.30 ms was considered indicative of radial tunnel syndrome. [16] (10.1016/s0363-5023(98)80163-9)
• [Case_report] The authors advocate for surgery in high radial nerve entrapment neuropathy cases resistant to conservative treatment, emphasizing the importance of dissecting the entire length of the fibrous tunnel. [17] (10.1016/j.jse.2025.02.060)
• [L4] The results of radial tunnel release have been sufficiently good thus far as to warrant some attention, with an overall significant improvement in 99 of 108 cases (91.7%) when combined with other series. [19] (10.1016/s0363-5023(79)80105-7)
• [L5] [20] (10.1016/j.jhsa.2009.10.016)
• [L5] Radial tunnel syndrome is a pain syndrome caused by compression of the posterior interosseous nerve at the proximal forearm. [22] (10.1016/j.ocl.2012.07.022)
• [L5] It is important to understand the anatomic course and distribution of the radial nerve in order to make an accurate diagnosis. [24] (10.1007/s11420-011-9238-8)
• [L5] The authors believe that a high rate of morbidity is associated with both the disease and its treatment, suggesting that great caution has to be taken before performing radial tunnel release. [26] (10.1097/00130911-200212000-00010)
• [L4] Nineteen patients (20 extremities), however, felt satisfied and helped and believed they gained improved function because of surgical decompression of the radial tunnel. [27] (10.1016/s0363-5023(97)80086-x)
• [L5] Radial tunnel syndrome (RTS) and posterior interosseous nerve (PIN) compression are distinct entities with different clinical presentations but share identical potential sites of nerve interference; the author proposes unifying them as mild (RTS) and severe (PIN compression) forms of one disease to simplify nomenclature. [29] (10.1177/1753193420953990)
• [L4] Muscle denervation edema or atrophy along the distribution of the posterior interosseous nerve is the most common MR finding in radial tunnel syndrome. [32] (10.1148/radiol.2401050028)
• [L4] Nerve injury is an uncommon though troublesome complication of fractures or dislocations of the elbow. [39] (10.1016/s0020-1383(79)80015-7)
• [L4] [48] (10.1016/j.jhsa.2007.10.001)
• [Paper] The authors acknowledge that their study does not establish diagnostic accuracy or a reference standard for radial tunnel syndrome. [49] (10.1177/17531934261463150)
• [L4] The authors suggest that great caution be taken before performing radial tunnel release and strict adherence to the indications noted during the preoperative examination. [50] (10.1053/jhsu.1999.0566)
• [L5] A symptomatic double-level entrapment of the posterior interosseous branch of the radial nerve is described. [51] (10.1016/s0363-5023(83)80202-0)
• [L5] The authors advocate for consistent use of the terminology distinguishing the deep branch of the radial nerve (DBRN) and the posterior interosseous nerve (PIN), and recommend viewing radial tunnel syndrome and posterior interosseous nerve syndrome as a single condition presenting along a spectrum of nerve entrapment. [52] (10.1177/17531934241254706)
• [L2] [81] (10.1016/j.jhsa.2024.09.023)
• [L5] [88] (10.1016/j.jisako.2024.03.001)
• [L4] This study indicates that pain in patients with radial tunnel syndrome may be treated successfully by surgical decompression of the superficial branch of the radial nerve. [104] (10.1177/1753193408099832)
• [L5] Supination increases the linear distance between the PIN and radial head and should be considered to increase the safe working volume whenever intra-articular procedures are performed on the anterolateral aspect of the elbow. [107] (10.1016/j.jse.2018.08.019)
• [L4] Dynamic ultrasonographic assessment of changes in the AP diameter and CSA is an effective diagnostic tool for identifying radial tunnel syndrome. [121] (10.1177/17531934261443138)
• [L4] Isolated PINN have shown excellent clinical outcomes, with few patients experiencing recurrent pain at long-term follow-up. [123] (10.1177/1558944717692093)
• [L4] Ultrasonography, computed tomography, and magnetic resonance imaging revealed the location of the ganglion in every patient. [124] (10.1016/s0363-5023(10)80102-9)
• [L4] Neuroimaging should be considered as a complementary diagnostic method in PINS. [132] (10.1212/wnl.0000000000003287)
• [L4] In the third patient, in whom the duration of entrapment was more than two years, a tendon transfer was used as treatment. [139] (10.2106/00004623-197355040-00009)

References¶

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