Radial Tunnel Syndrome in Raleigh, NC
What is Radial Tunnel Syndrome?
Radial tunnel syndrome (RTS) is a compressive neuropathy of the posterior interosseous nerve (PIN) in the proximal forearm that causes chronic lateral elbow and forearm pain. Unlike posterior interosseous nerve syndrome, which presents with motor weakness and finger drop, radial tunnel syndrome is primarily a pain syndrome without significant motor deficits.
The condition occurs when the posterior interosseous nerve becomes compressed as it passes through the radial tunnel, a fibro-osseous space in the proximal forearm. The radial tunnel extends from the radiocapitellar joint to the distal edge of the supinator muscle.
Anatomy and Pathophysiology
At the elbow, the radial nerve divides into two branches:
– Superficial branch: Provides sensory innervation only
– Deep branch (posterior interosseous nerve): Provides motor innervation to the forearm extensors
The posterior interosseous nerve can become compressed at several anatomical sites within the radial tunnel
– Fibrous bands anterior to the radial head
– Recurrent radial vessels (leash of Henry)
– Arcade of Frohse (proximal edge of the supinator muscle)
– Distal edge of the supinator muscle
The arcade of Frohse is the most common site of compression.
Clinical Presentation and Symptoms
Primary Symptoms
Patients with radial tunnel syndrome typically present with:
– Chronic lateral elbow pain extending 3-4 cm distal to the lateral epicondyle along the proximal lateral forearm[5]
– Pain that persists for more than 6 months and is resistant to conservative treatment[6]
– Pain exacerbated by repetitive forearm rotation, gripping activities, and wrist/finger extension
– Symptoms that may occur during activity or sleep[5]
Key Distinguishing Features
Unlike lateral epicondylitis (tennis elbow), radial tunnel syndrome presents with:
– Tenderness over the radial tunnel anterior to the radial head, rather than directly over the lateral epicondyle
– Pain located more distally in the forearm (4-5 cm distal to lateral epicondyle)
– No significant motor weakness or finger drop (which would indicate posterior interosseous nerve syndrome)
Diagnosis
Physical Examination
Three pathognomonic signs indicate radial tunnel syndrome:[6]
1. Point tenderness: Palpation over the radial tunnel anterior to the neck of the radius reproduces symptoms
2. Resisted supination test: Pain with resisted forearm supination
3. Resisted middle finger extension test: Pain with resisted extension of the middle finger
Additional provocative tests include:
– Cozen’s test: Pain with resisted wrist extension
Diagnostic Imaging and Testing
Electrodiagnostic Studies: Radial tunnel syndrome typically has no specific electrodiagnostic findings, which distinguishes it from other radial nerve pathologies. Normal nerve conduction studies and electromyography are expected.
Ultrasound: May reveal increased cross-sectional area of the posterior interosseous nerve, though findings can be variable.Ultrasound-guided diagnostic nerve blocks can help confirm the diagnosis.
MRI: Can identify space-occupying lesions (lipomas, ganglion cysts) or synovitis that may be compressing the nerve
Differential Diagnosis
Radial tunnel syndrome must be differentiated from:
– Lateral epicondylitis (tennis elbow) – most common
– Posterior interosseous nerve syndrome (presents with motor weakness)
– Cervical radiculopathy
– Superficial radial nerve entrapment
Notably, radial tunnel syndrome frequently coexists with treatment-resistant lateral epicondylitis in up to 44% of cases.[7]
Treatment Options
Conservative Management
Initial treatment should be conservative for at least 6 weeks:
Activity Modification
– Rest from aggravating activities
– Avoidance of repetitive forearm rotation and gripping
Splinting
– Wrist and elbow splinting to reduce nerve tension
Physical Therapy
– Stretching and strengthening exercises
– Nerve gliding techniques
Medications
– NSAIDs for pain and inflammation management
Emerging Conservative Treatments
Recent evidence supports newer interventional approaches:
1. Ultrasound-guided corticosteroid injections: Perineural infiltration with corticosteroids and local anesthetic at the arcade of Frohse has shown promising results, with pain resolution in 98% of patients in one study
2. Hydraulic release (hydrodissection): Using saline solution to separate the nerve from surrounding compressive structures under ultrasound guidance
3. Dry needling: Targeted dry needling of the affected area may provide symptom relief
Surgical Treatment
Indications for Surgery:
– Failure of conservative treatment after 6 months
– Presence of space-occupying lesions
– Severe, debilitating symptoms
Surgical Technique:
Surgical decompression involves release of all potential compression sites:
– Release of fibrous bands
– Division of recurrent radial vessels
– Release of the arcade of Frohse
– Complete release of the superficial head of the supinator muscle
The procedure can be performed through dorsal or anterior approaches
Surgical Outcomes:
– Success rates range from 67% to 92%
– Poorer outcomes are associated with:
– Concurrent lateral epicondylitis
– Workers’ compensation claims
Some evidence suggests that decompression of the superficial branch of the radial nerve (either alone or in combination with PIN release) may improve surgical outcomes, with satisfaction rates of 92% in select studies.
Prognosis
Radial tunnel syndrome has historically been challenging to treat conservatively, with many patients ultimately requiring surgical intervention.[1] However, emerging ultrasound-guided injection techniques show promise as alternatives to surgery. Surgical decompression remains the standard treatment for refractory cases, with generally favorable outcomes when appropriate patient selection criteria are applied.
Key Takeaways
– Radial tunnel syndrome is a pain syndrome caused by compression of the posterior interosseous nerve without motor weakness
– Diagnosis is primarily clinical, based on characteristic pain location and provocative physical examination findings
– Electrodiagnostic studies are typically normal
– Conservative treatment should be attempted for at least 6 weeks
– Ultrasound-guided corticosteroid injections represent a promising minimally invasive option
– Surgical decompression is effective for refractory cases, with success rates of 67-92%
Why Choose Dr. Chambers for Hand and Wrist Care
At Raleigh Orthopaedic Clinic, Dr. Stephen Chambers specializes in hand and upper extremity surgery. With years of expertise in treating hand and wrist injuries, including Radial Tunnel Syndrome Treatment. Dr. Chambers provides comprehensive care—ranging from at home treatments and injections to advanced hand surgery when needed. Patients trust Dr. Chambers and his team for personalized care, effective treatment options, and excellent outcomes and describe Dr. Chambers as a caring, attentive, and skilled surgeon with excellent bedside manner. His amazing team ensures every patient feels supported and informed throughout the process.
If you are experiencing hand pain, swelling, or difficulty with wrist movements, don’t wait for symptoms to worsen. Schedule an Appointment with Dr. Chambers today to Radial Tunnel Syndrome Treatment. and get back to normal use of your hand . Experience the benefit of specialized hand care close to home at Raleigh Orthopaedics in Raleigh, Cary, Holly Springs, and Wake Forest, North Carolina.