Nerve Condition · Often Misdiagnosed as Tennis Elbow

Radial Tunnel Syndrome Treatment in Raleigh, NC

Outer elbow pain that hasn't responded to tennis elbow treatment? Radial tunnel syndrome is a compression of the radial nerve that mimics lateral epicondylitis but requires completely different treatment. Accurate diagnosis is everything.

What Is Radial Tunnel Syndrome?

Radial tunnel syndrome is compression of the radial nerve as it passes through the radial tunnel — a narrow passage in the forearm just below the elbow. The radial nerve controls sensation and movement in parts of the forearm, wrist, and hand. When compressed in the radial tunnel, it produces outer elbow and forearm aching that is remarkably similar to tennis elbow.

This similarity is the core problem: radial tunnel syndrome is one of the most frequently misdiagnosed conditions in orthopedic practice. Patients are often treated for tennis elbow — with PT, cortisone injections, even surgery — without improvement, because the actual problem is a nerve, not a tendon.

Misdiagnosed

Most commonly as tennis elbow

4 cm

Below lateral epicondyle — key location

Nerve

Radial nerve compression

Surgery

When conservative care fails

How to Tell Radial Tunnel Syndrome from Tennis Elbow

The key distinguishing features:

Feature	Tennis Elbow	Radial Tunnel Syndrome
Tender point	Lateral epicondyle	4 cm below epicondyle
Pain type	Sharp with gripping	Dull ache, worse at night
Resisted wrist extension	Positive (pain at epicondyle)	Positive (pain in forearm)
Middle finger extension test	Negative or mild	Strongly positive
Response to cortisone	Temporary relief	No relief (nerve, not tendon)

The 4cm RuleThe most reliable clinical sign: press firmly 4 cm (about 1.5 inches) directly below the lateral epicondyle, along the radial nerve course. In radial tunnel syndrome, this reproduces the pain. In pure tennis elbow, the maximum tenderness is at the epicondyle itself. This single test point is the key to distinguishing the two conditions.

Treatment

Conservative (First Line)

Activity modification: Avoid repetitive forearm rotation and sustained gripping
Nerve gliding exercises: Radial nerve mobilization to restore normal nerve movement through the tunnel
Wrist splinting in slight extension — reduces radial nerve tension
NSAIDs for pain management
Cortisone injection is generally not helpful for pure radial tunnel syndrome (confirms diagnosis if it doesn't work)

Surgical Decompression

For radial tunnel syndrome that fails 3–6 months of conservative care, surgical decompression of the radial nerve is indicated. The arcade of Frohse (a fibrous arch at the entry to the radial tunnel) is the most common site of compression and is released. Outcomes are good when the diagnosis is accurate, though recovery takes 3–6 months.

How do I know if it's radial tunnel syndrome or tennis elbow? +

The two most reliable distinguishing features are: (1) maximum tenderness 4 cm below the lateral epicondyle rather than at it, and (2) failure to respond to treatments that work for tennis elbow (eccentric PT, bracing, cortisone injection). If you have been treated for tennis elbow for 3+ months without improvement, radial tunnel syndrome should be evaluated. Dr. Chambers has specific provocative tests that help make this distinction.

Can you have both tennis elbow and radial tunnel syndrome at the same time? +

Yes — dual pathology occurs and makes diagnosis more challenging. In these cases, the more distal tenderness (4 cm below epicondyle) from the radial tunnel component may be masked by the more proximal epicondylar tenderness of tennis elbow. Careful examination with attention to the specific locations of tenderness can identify both components.

Related Conditions

Tennis Elbow Treatment Not Working? It Might Be Your Nerve.

Radial tunnel syndrome is frequently misdiagnosed as tennis elbow. Dr. Chambers can distinguish the two with a focused clinical exam. No referral needed.

Book Online Now