Is It Tennis Elbow or a Pinched Nerve (Radial Tunnel Syndrome)?

Lateral elbow pain that does not respond to standard tennis elbow treatment is sometimes radial tunnel syndrome, compression of a nerve branch just below the elbow that produces very similar pain. The two conditions frequently coexist, and distinguishing them usually requires a focused hands-on exam rather than symptoms alone.

Being told your tennis elbow should have responded to treatment by now, when it has not, is a reasonable moment to ask whether something else is also going on.

The Mechanism

The posterior interosseous nerve, a branch of the radial nerve, passes through a narrow passage in the upper forearm called the radial tunnel, just below the lateral epicondyle of your elbow. When that nerve is compressed, most often by the fibrous edge of the supinator muscle, it produces radial tunnel syndrome, an aching pain that sits close to, but is not identical to, the tenderness of classic tennis elbow.

The two conditions are frequently confused because they share so much anatomical territory. Tenderness from tennis elbow is typically felt directly over the lateral epicondyle, while radial tunnel pain is usually centered a few centimeters below, along the forearm itself, and tends to worsen with resisted supination (rotating the palm up) or extension of the middle finger rather than only with gripping.

A clinical review notes that radial tunnel syndrome coexists with lateral epicondylitis in roughly 5 percent of cases and is often difficult to distinguish from it using symptoms alone. One study of patients with lateral epicondylitis that had not responded to standard treatment found radial tunnel syndrome present on physical exam in 46 percent of them, with nerve testing confirming it in over a third.

This overlap matters because the two conditions do not resolve with the same treatment. Tendon loading and dry needling target degenerated tendon tissue. A compressed nerve needs the compression itself addressed. When radial tunnel involvement goes unrecognized, a well-designed tendon program can plateau, not because the approach was wrong, but because it was treating only part of the problem.

When It's Something More Serious

Progressive weakness in wrist or finger extension, a wrist that drops or cannot be held up against gravity, or symptoms that are steadily worsening despite treatment need prompt evaluation. Numbness or tingling that spreads into the hand, or symptoms following a direct injury to the forearm, should also be assessed promptly.

How This Gets Addressed

Because the treatment differs depending on which structure is involved, the exam needs to test both possibilities directly.

Chiropractic care assesses and treats the cervical spine contribution common to both conditions and restores forearm and wrist joint mechanics.

Dry needling reduces tension in the supinator and surrounding forearm muscles that can be compressing the nerve, while also treating any coexisting tendon degeneration directly.

Physical therapy restores nerve mobility and builds graded loading appropriate to what is actually driving the pain.

Naturopathic medicine evaluates systemic factors that affect how well any irritated nerve tolerates pressure.

You can learn more about our full approach to elbow pain here.

Most patients see renewed progress once the correct structure is identified and treated directly, often within a few weeks of a plateaued tendon program finally moving again, although a nerve that has been compressed for a long time may take longer to fully settle.

Written By:

Dr. Jason Winkelmann

Naturopathic doctor, Chiropractor, Chronic Pain Specialist, and Educator

Frequently Asked Questions

How can I tell if my elbow pain is radial tunnel syndrome instead of tennis elbow?

Pain centered a few centimeters below the bony point of the elbow, rather than directly over it, along with pain triggered by resisting rotation of the forearm or extension of the middle finger, points more toward radial tunnel syndrome. A hands-on exam that isolates each structure is more reliable than self-assessment, since the two overlap closely.

Why hasn't my tennis elbow treatment worked if I actually have radial tunnel syndrome?

Tendon-focused treatments such as loading programs and dry needling address degenerated tendon tissue. If a compressed nerve is the primary driver, or a significant contributor, those same treatments will produce only partial or temporary relief, since the compression itself is never addressed.

Can tennis elbow and radial tunnel syndrome happen at the same time?

Yes, research shows this is a fairly common presentation, and when it occurs, both need to be assessed and treated, since treating only the tendon will leave the nerve component, and some of your symptoms, unresolved.