If you have been told you have tennis elbow but the treatment is not working, there is a good chance something else is going on. Radial tunnel syndrome is one of the most commonly missed conditions in the forearm — and it is missed precisely because it looks so much like tennis elbow on the surface.
Understanding what it actually is, and why it behaves the way it does, is the first step toward getting the right help.
What is Radial Tunnel Syndrome?
The radial nerve travels from your neck, down the back of your arm, and into your forearm. As it enters the forearm just past the elbow, it passes through a narrow corridor called the radial tunnel — and this is where things can go wrong.
When the structures in that tunnel compress or irritate the nerve, the result is radial tunnel syndrome. Unlike a nerve injury that causes numbness or weakness, this condition is primarily a pain problem. The nerve is not severely damaged — it is irritated, and that irritation produces a deep, persistent aching in the outer forearm that gets worse with use.
What Does it Feel Like?
The most distinctive feature of radial tunnel syndrome is where it hurts. The pain sits about four to five centimetres below the bony point on the outside of your elbow — not at it. This is the detail that separates it from tennis elbow, where the tenderness is right at that bony landmark.
People typically describe:
- A deep aching or burning in the outer forearm
- Pain that worsens with gripping, lifting, or rotating the forearm
- Fatigue and heaviness in the arm after use
- Symptoms that build throughout the day, particularly with repetitive tasks
Tingling and numbness are usually not prominent features — which again is different from what people expect with a nerve problem.
Who Gets it and Why?
Radial tunnel syndrome tends to develop in people whose work or sport involves a lot of repetitive forearm rotation and gripping. Think tradespeople, musicians, racquet sport players, and office workers doing sustained keyboard and mouse work.
Sometimes it develops after a significant increase in activity — a new project at work, a change in training load, or returning to a sport after a break. The nerve becomes irritated gradually, and by the time symptoms are noticeable, the pattern is already established.
In some people, the anatomy itself is a contributing factor. A more fibrous tunnel or a tighter muscle arch can make the nerve more vulnerable, even without an obvious trigger.
Why is it So Often Missed
The honest answer is that radial tunnel syndrome does not show up on standard tests. Nerve conduction studies — the electrical tests used to assess nerve function — are frequently normal, because the compression is not severe enough to slow the nerve’s signals measurably. MRI and X-ray do not typically show it either.
This means that many people are told their tests are normal and the diagnosis defaults back to tennis elbow, even when treatment for tennis elbow produces no improvement. The diagnosis is a clinical one — it depends on a detailed assessment of the pattern of symptoms and specific hands-on tests, not on imaging.
What Can Be Done About It?
The good news is that radial tunnel syndrome responds well to conservative care in most cases.
- Identifying and modifying what is driving it is always the starting point. This does not mean stopping everything — it means finding the level of activity that allows things to settle, and adjusting technique or setup where possible.
- Manual therapy directed at the tight structures around the nerve — particularly the supinator muscle and the surrounding forearm — can significantly reduce the compression driving the symptoms.
- Neural mobilisation exercises are an important part of recovery. The radial nerve needs to glide freely through the tunnel, and specific exercises help restore that movement gradually and without aggravation.
- Strengthening of the forearm muscles becomes the focus once the acute phase has settled, building the resilience needed to return to full activity without recurrence.
In cases that do not respond adequately to conservative care, a guided corticosteroid injection or surgical decompression may be considered — but the majority of people do not need to go down that path.
What to Expect
Most people with radial tunnel syndrome see meaningful improvement over two to four months with the right treatment. The frustration is usually in the time spent being mismanaged beforehand — because once the correct diagnosis is established and treatment is properly directed, progress tends to be steady.
If forearm pain has been going on longer than it should, or if a tennis elbow diagnosis has not quite added up, it is worth having the radial tunnel specifically assessed.
Call us on (02) 8018 8883 to speak with one of our Chiropractors at Aret Chiropractic in North Ryde, or book online for a consultation.
References
Roles, N. C., & Maudsley, R. H. (1972). Radial tunnel syndrome: Resistant tennis elbow as a nerve entrapment. Journal of Bone and Joint Surgery, 54-B(3), 499–508.
Naam, N. H., & Nemani, S. (2012). Radial tunnel syndrome. Orthopedic Clinics of North America, 43(4), 529–536.
Huisstede, B. M. A., et al. (2006). Radial tunnel syndrome: A systematic review of its treatment. Disability and Rehabilitation, 28(17), 1033–1042.
Shacklock, M. (2005). Clinical Neurodynamics: A New System of Musculoskeletal Treatment. Elsevier.