Radial Tunnel Syndrome · Kitchener, Waterloo & Cambridge
Radial tunnel syndrome is an aching pain in the outer, upper forearm, put down to pressure on a branch of the radial nerve just below the elbow. It causes pain without weakness and is often mistaken for tennis elbow. It is rare, no controlled trial has tested any treatment for it, and care starts with changing the activity that sets it off. At CARESPACE you start with a physiotherapist or a chiropractor, who sorts it from tennis elbow and begins treatment at that visit.
What radial tunnel syndrome is
The posterior interosseous nerve is a branch of the radial nerve. It passes through the upper forearm in a passage known as the radial tunnel, where five structures along its path can press on it; the most common is a fibrous band called the arcade of Frohse. The condition also goes by radial nerve compression or radial nerve entrapment.
It is rare, with an estimated annual incidence of 0.003%, and it is debated: a standard medical reference calls it “an entity with much debate”, and some specialists question whether it exists as a separate condition.
The same branch can also produce a different picture. In posterior interosseous nerve syndrome the problem is weakness in straightening the fingers, thumb or wrist. Radial tunnel syndrome, by definition, is pain with normal strength.
Symptoms of radial tunnel syndrome
- A deep ache in the back and outer side of the upper forearm
- A tender spot in the forearm muscles about 2 to 5 cm below the bony point on the outside of the elbow
- Pain that gets worse with activity, and sometimes during sleep
- Pain when you turn the palm up, or straighten the middle finger, against resistance
- No true weakness and, as a rule, no numbness, although tingling over the back of the hand between the thumb and index finger has been reported
What causes it
The recognized risk is repeated turning of the forearm, palm up and palm down, the motion of turning a screwdriver. A review for family physicians names carpenters and mechanics, and a Washington State guideline ties work-related cases to repetitive work activities. In Waterloo Region that covers the trades, the auto shops and a good deal of assembly work.
How it is diagnosed, and how it differs from tennis elbow
Location is the difference. Tennis elbow is tender on the bony point at the outside of the elbow. Radial tunnel syndrome is tender further down, in the muscle of the forearm. The two can also occur together: radial tunnel syndrome accompanies about 5% of cases of tennis elbow. A practitioner presses along the nerve, tests the palm-up turn and the middle finger against resistance, and checks that finger, thumb and wrist strength are normal.
No test confirms it. Nerve conduction studies and EMG are normal in radial tunnel syndrome, and MRI has a limited role; both are used mainly to rule out other causes, such as a nerve trapped in the neck. Without a confirming test, the diagnosis rests on the examination. That is part of why it is debated.
When forearm pain needs prompt medical care
These signs come from the UK’s NHS advice for elbow and arm pain, given here with Ontario equivalents. Call 911 (999 in the UK) if arm pain comes on suddenly together with pressure, heaviness or squeezing across your chest: this could be a sign of a heart attack. Go to an urgent care clinic or an emergency department (the NHS says an urgent treatment centre or A&E) if you have severe pain in your arm and it is difficult to move, if you injured your arm and heard a snapping noise or the arm has changed shape, or if your arm tingles or feels numb. Get medical advice the same day, from a physician or nurse practitioner, an urgent care clinic or an emergency department (the NHS says its 111 service), if your arm hurts when you exercise and the pain goes away when you rest, or if it is swollen and you have a very high temperature or feel hot, cold or shivery. None of these should wait for an appointment with us.
The emergency departments in Waterloo Region are:
- WRHN @ Midtown (formerly Grand River Hospital), 835 King St. W., Kitchener
- WRHN @ Queen’s Blvd. (formerly St. Mary’s General Hospital), 911 Queen’s Blvd., Kitchener
- Cambridge Memorial Hospital, 700 Coronation Blvd., Cambridge
If you cannot get there safely, call 911.
About weakness, tingling and numbness. Radial tunnel syndrome should not make the hand weak. See a physician or nurse practitioner right away if you have difficulty straightening your fingers, thumb or wrist, or if weakness or numbness is constant or getting worse: that points to a nerve that is losing function, not to radial tunnel syndrome. The NHS line on tingling does not separate a sudden loss of feeling from tingling that has come and gone for weeks, so follow it if numbness or weakness comes on suddenly, follows an injury, or you cannot tell which you have.
What the evidence says about treating radial tunnel syndrome
- There are no controlled trials. A systematic review that set out to assess treatments found no randomized or controlled trials at all. Of 21 case series, six were good enough to analyze, and every one was about surgery. It concluded that the effectiveness of non-surgical treatment is unknown.
- Non-surgical care comes first anyway. Treatment is initially non-operative: changing activities, anti-inflammatory medicine and a removable splint. The Washington State guideline, written for workers’ compensation claims, lists activity modification, a splint that keeps the forearm palm-up or the wrist bent back, physiotherapy and anti-inflammatory medicine, and says no one method has been proven most effective.
- Physiotherapy is an add-on in the sources. The medical reference calls it an adjunct. The family-physician review describes it as focusing on ergonomics, then stretching, then strengthening.
- Injection: one small study. Of 25 people given a steroid and local anaesthetic injection, 72% had complete relief of their forearm pain at six weeks, and 60% were still pain-free at two years.
- Surgery: mixed results. The systematic review found a “tendency” that surgical release might be effective, using a grading scheme its authors built for case series. Reported success ranges from 39% with good results in one series of 28 operations, through 60% to 70%, to 92% to 95% in other reports, and a 2025 review says recent data suggest lower rates than the earlier studies. Recovery after surgery can take 9 to 18 months.
- Who does less well. Satisfaction after surgery was poorer in people with other nerve compression syndromes or workers’ compensation claims.
What a doctor may offer
CARESPACE does not provide these, but it helps to know where they fit. A physician or nurse practitioner can prescribe anti-inflammatory medicine, arrange nerve tests or imaging to rule out other causes, and give or arrange an injection. Surgery to release the tunnel is reserved for severe cases that have not responded. The Washington State guideline will not authorize it without objective findings on examination and an abnormal EMG.
How each CARESPACE service treats radial tunnel syndrome
Physiotherapy
A physiotherapist can find the tender point in the forearm muscles, compare it with the bony point where tennis elbow hurts, test the palm-up turn and the middle finger against resistance, and confirm that strength is normal. Care can begin with the job or hobby: which repeated turning or straight-arm positions to cut back, and how to set up the task differently. Stretching and then strengthening follow. A removable splint has a place in the sources, and CARESPACE supplies splints and braces.
Chiropractic
A chiropractor can examine the elbow, forearm, wrist and neck, since a nerve trapped in the neck is one of the conditions to rule out. Care for radial tunnel syndrome can cover the same ground: activity changes, exercises and advice on a splint. Our sources report no study of hands-on treatment for this condition.
Other services people ask about
The sources below say nothing about massage therapy or acupuncture for radial tunnel syndrome. The non-surgical care they list is activity change, splinting, physiotherapy and anti-inflammatory medicine.
Where most people start
Book with a physiotherapist or a chiropractor. If your fingers, thumb or wrist are weak, start with a physician or nurse practitioner instead.
How your team works together
One practitioner usually looks after this. When tennis elbow is present as well, the same practitioner treats both. If the forearm is no better after six weeks, the next step is your physician or nurse practitioner, for an injection or a specialist’s opinion; six weeks without improvement is the Washington guideline’s marker for a specialist consultation in workers’ compensation claims.
Physiotherapists
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Available this week
Eric Bowman, BSc, MPT, PT
Physiotherapist
If you are looking for physiotherapy in Waterloo, you are probably not looking for a rushed appointment or a generic sheet of exercises.
Chiropractors
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Shannon Webster, BA (Hons), DC
Chiropractor, Clinic Director
You should not have to keep organizing your life around pain when Dr.
No availability About Shannon Osteopathic Manual Practitioners
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Evening availability
Aliya Malek, BPT, DOMP
Osteopathic Manual Practitioner, Assistant Director
You don’t need another rushed appointment when your body is asking for careful, skilled hands and a plan that finally makes sense.
Browse by service: physiotherapists and chiropractors.
What to expect at your first visit
- The ache and the work. Where it sits, whether nights are affected, and the turning, gripping and reaching your job and hobbies involve.
- Bony point or forearm muscle. Pressure on the outside of the elbow and then a few centimetres below it.
- Resisted tests and strength. The palm-up turn, the middle finger, and finger, thumb and wrist straightening.
- What it points to: radial tunnel syndrome, tennis elbow, both, or something a physician should see.
- Treatment at that visit, and a plan to leave with: what to change in the task, and your first exercises.
What you can do at home
- Cut back the repeated forearm turning that brings it on, and avoid holding the elbow straight for long periods with the palm turned down and the wrist bent.
- Fix the task first: Canada’s workplace health agency says the job itself should be redesigned and that splints call for extreme caution.
- If you want to try an anti-inflammatory medicine, check with a pharmacist first.
How long it takes
Our sources give no recovery time for non-surgical care. The Washington guideline’s marker, for workers’ compensation claims, is a specialist consultation if there has been no improvement within six weeks. For the related nerve problem that causes weakness, a 2025 review gives at least three months of non-surgical care before surgery is considered. Surgery is slow to pay off: relief can take 9 to 18 months.
Radial tunnel syndrome treatment in Kitchener, Waterloo and Cambridge
Kitchener. Physiotherapy in Kitchener and Chiropractic in Kitchener. Locations: Victoria North, Fischer-Hallman, Westmount East and Deer Ridge.
Waterloo. Physiotherapy in Waterloo and Chiropractic in Waterloo. Locations: Weber North, Uptown Waterloo and Waterloo GoodLife.
Cambridge. Physiotherapy in Cambridge. Location: Hespeler Road.
The city pages linked above show the locations and practitioners for each service, with their next availability.
Common questions
Is it tennis elbow or radial tunnel syndrome?
Tennis elbow is tender on the bony point at the outside of the elbow. Radial tunnel syndrome is tender a few centimetres further down, in the forearm muscle, and aches more deeply.
Can I have both?
Yes. Radial tunnel syndrome accompanies about 5% of cases of tennis elbow.
Will a nerve test show radial tunnel syndrome?
No. Nerve conduction studies and EMG are normal in it. They are used to look for other causes.
Does a splint help?
It is part of usual non-surgical care: a removable splint that holds the wrist bent back or the forearm palm-up. No study has tested it against going without.
Is radial tunnel syndrome a real condition?
It is debated. No test confirms it, and some specialists doubt that it is a separate condition. The pain is real either way, and the first steps are the same: find the activity that provokes it and change it.
Where can I get radial tunnel syndrome assessed in Waterloo?
Physiotherapy in Waterloo and Chiropractic in Waterloo are both places to start. Book online or call 519-208-2273 and our Central Reception Team will find the closest location with an opening.
Do I need a referral?
No. Book online or call 519-208-2273. You pay at each visit and receive a receipt for your extended health plan. More on fees and insurance →
Sources
- Huisstede B, Miedema H, van Opstal T, de Ronde M, Verhaar J, Koes B. Interventions for treating the radial tunnel syndrome: a systematic review of observational studies. Journal of Hand Surgery, 2008 (abstract, Erasmus University repository).
- Shamrock AG, Das JM. Radial Tunnel Syndrome. StatPearls, last updated August 2023.
- Washington State Department of Labor & Industries. Work-Related Radial Nerve Entrapment: Diagnosis and Treatment. 2010; reformatted June 2023.
- Kane SF, Lynch JH, Taylor JC. Evaluation of Elbow Pain in Adults. American Family Physician, 2014.
- Bartoletti D, Gupta A, Bohne W, Gresham S, Ghayyad K, Kachooei AR. Peripheral Nerve Syndromes at the Elbow: A Review of Current Treatments. Archives of Bone and Joint Surgery, 2025.
- Canadian Centre for Occupational Health and Safety. Musculoskeletal Disorders (MSDs). OSH Answers fact sheet, revised October 2026.
- NHS (UK). Elbow and arm pain. Reviewed January 2024.
Related conditions
Tennis Elbow · Elbow Pain · Cubital Tunnel Syndrome · Pronator Teres Syndrome · Pinched Nerve in the Neck
Ready to book?
Book online with a physiotherapist or chiropractor, or call 519-208-2273 and our Central Reception Team will match you with the right person and the closest location.