Peroneal Tendonitis: who to see and what helps

Peroneal Tendonitis · Kitchener, Waterloo & Cambridge

Peroneal tendonitis is pain and swelling in the two tendons that run behind the outer ankle bone, usually from overuse, sometimes in an ankle that has been sprained before. The vast majority of cases heal without surgery: ease the load for a few weeks, then build it back with strengthening. At CARESPACE the first visit is with a physiotherapist or a chiropractor, and both assess and treat that day.

What peroneal tendonitis is

The two peroneal tendons sit just behind the fibula, the bone you can feel on the outside of the ankle. The shorter one attaches to the outer edge of the foot; the longer one runs under the foot to its inner side. Their main job is turning the foot outward, and they help steady the outside of the ankle.

The names overlap. Tendinitis, strictly, is a freshly inflamed tendon, usually just after an injury, and tendinosis is the long-running version in which the tendon has enlarged and thickened. You will also see peroneal tendinopathy, and fibularis in place of peroneal.

Symptoms of peroneal tendonitis

• Pain around the back and outside of the ankle, sometimes with swelling behind the outer ankle bone
• Pain that can run along the tendon toward the outer edge of the foot
• A gradual start that slowly gets worse, usually with no single injury
• Pain with walking, running and jumping that eases with rest
• Pain when the foot is turned inward or when you rise onto the ball of the foot
• Feeling unsteady on uneven ground, with poorer balance on that leg

What causes peroneal tendonitis

Overuse: a repetitive activity that irritates the tendons over a long period. Marathon running is the characteristic example. A rapid increase in training, poorly fitting or unsupportive shoes and running on uneven surfaces all contribute; around here that last one usually means trail running rather than pavement. People with high arches may be more susceptible, because the heel is turned slightly inward. A history of ankle sprains matters too: an international expert panel calls peroneal tendon disorders a serious cause of symptoms at the back and outside of the ankle after a sprain. Being overweight, diabetes, inflammatory arthritis and smoking are also listed as risk factors.

How peroneal tendonitis is diagnosed

From the history and an examination: tenderness along the tendons just behind the outer ankle bone, and pain or weakness when you turn the foot outward against resistance. Pain directly over the bone suggests a different problem. X-rays are usually normal; ultrasound is a very effective way to look at the tendons, and an MRI may show a tear. After a twisting injury, a clinician applies the Ottawa ankle rules to decide whether an X-ray is needed. An X-ray can be ordered by a chiropractor in Ontario; an ultrasound or MRI goes through a physician or nurse practitioner.

When outer ankle pain needs urgent care

Call 911 or go to an emergency department if the foot turns pale, white, blue or grey, or feels cold to the touch, whether or not there was an injury. After an injury, do the same if you heard a crack when it happened, the leg, ankle or foot has changed shape or points at an odd angle, or it is numb, tingling or has pins and needles. Do not drive yourself.

Get medical care the same day, from a physician, a nurse practitioner, an urgent care clinic or an emergency department, if the pain is severe; you cannot move the foot, put any weight on the ankle or walk more than a few steps; you feel faint, dizzy or sick from the pain; the foot or ankle has suddenly become unstable when you step down (a new change, not the gradual trouble with uneven ground listed under symptoms); the foot has gone numb or tingly, or looks twisted or out of its normal position, without an injury; the ankle or foot is hot, red, swollen and painful, has red streaks leading from a sore area, or is draining pus; or you also have a fever, or feel hot, cold or shivery. After an injury, the same applies if the pain is getting worse; the swelling or bruising is large or still growing; you heard a snap, grinding or popping noise when it happened; or the ankle is very stiff or hard to move. These can be signs of a broken bone, a torn tendon or an infection.

Sudden, severe pain in a tendon during an accident or activity, sometimes with a pop or snap, can mean the tendon has torn. That is a same-day matter too.

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.

See a physician or nurse practitioner if the pain is stopping your normal activities, keeps coming back, is getting worse without an injury, or has not improved after two weeks of looking after it yourself. If you have diabetes, see your health-care provider or foot specialist right away for any swelling, warmth, redness or pain in your legs or feet. The lists in this section follow NHS and MyHealth Alberta advice, put in Ontario terms; the diabetes line is Diabetes Canada’s.

What the evidence says about treating peroneal tendonitis

• Where these points come from. A 2018 international consensus statement (a 16-member panel, 14 of them orthopaedic surgeons), two Scottish health-board pathways and American surgeons’ public guidance. The panel says practice rests mainly on level IV and V evidence, with limited and varied evidence on how non-surgical treatment of the acute form turns out.
• Ease the load, then reload. The sequence is rest, ice, compression and elevation at first; weight-bearing once it is painless; then range-of-motion and tendon-loading exercises. Strengthening is described as very important, and the return to training as very slow and based on pain.
• A boot or no boot: the sources differ. The panel agreed that immobilization should be avoided. The surgeons’ guidance suggests a walking boot for several weeks when pain is significant, and an ankle brace when it is not.
• Shoes, braces and insoles. Supportive trainers or hiking boots with a slightly raised heel are advised, with a wide sole or a high collar while the ankle feels unstable. In NHS Borders’ guidance, if six weeks of that has not helped, or the ankle keeps spraining, the next step is an insole or an ankle brace; the Glasgow pathway has insoles off the shelf or custom made depending on severity. For a heel that turns inward, an orthotic that tilts the ankle the other way may help.
• Not supported by high-quality evidence. The Glasgow pathway for persistent outer ankle pain lists acupuncture, low-level laser, therapeutic ultrasound and corticosteroid injection as things to consider only when the evidence-based treatments have failed and there is a clear clinical reason.
• Shockwave and injections. When symptoms last beyond three months the panel sees “some suggestion” for shockwave therapy, drawn from tendon problems of the leg in general. Evidence for platelet-rich plasma is insufficient, and the surgeons’ guidance says steroid injections are not routinely done because of the risk of a complete rupture.

What a doctor may offer

Outside what CARESPACE provides: an ultrasound or MRI, the injections described above, and surgery. Surgery may be considered after non-surgical treatment that could last up to a year. The exception is an athlete whose tendons have newly slipped out of place, for whom non-surgical management is not advised.

How each CARESPACE service treats peroneal tendonitis

Physiotherapy

A physiotherapist can pin down where the pain comes from: pressing along the tendons behind the outer ankle bone, testing the outward turn against resistance, and checking your balance on that leg. Treatment starts with what to cut back for a few weeks, then moves to tendon-loading and strengthening exercises that progress as pain allows. Shoe advice and a brace can be part of it; CARESPACE supplies ankle braces.

See our physiotherapy team →

Chiropractic

A chiropractor can examine the ankle and foot, including the high arch and inward-turned heel that may make these tendons more susceptible, and after a twisting injury can apply the Ottawa ankle rules and order an X-ray. For an ankle that keeps giving way, the physiotherapy guideline for ankle sprains says joint mobilization and manipulation should be used to improve ankle bend and balance in the short term. That recommendation is about the unstable ankle, not the tendon.

See our chiropractic team →

Kinesiology

A kinesiologist can build the strengthening and balance program and manage the return to running: cross-training while the tendon is sore, then training added back very slowly and judged by pain. Balance training is a first-line recommendation for a persistently sore outer ankle.

See our kinesiology team →

Other services people ask about

Massage therapy. None of the sources we read mentions massage for peroneal tendonitis. Acupuncture is on the not-supported list above. Dry needling of the peroneal muscles may be used with balance training for an ankle that keeps giving way, on weak evidence; nothing we read tested it for the tendon itself. Some CARESPACE physiotherapists offer dry needling.

Where most people start

With a physiotherapist or a chiropractor. Bring the shoes you run or work in.

How your team works together

Often one practitioner is enough. Your physiotherapist or chiropractor can set the plan, and a kinesiologist can take over the strengthening and the return to running once the pain is settling.

Browse by service: physiotherapists, chiropractors and kinesiologists.

What to expect at your first visit

1. The story. When it started, what changed in your training, shoes or running surface, and whether this ankle has been sprained.
2. The ankle. Where it is tender, how it responds when you turn the foot out against resistance, the shape of the arch and heel, and your balance on one leg. After an injury, the X-ray check comes first.
3. Treatment at that visit, and what happens next: what to cut back, your first exercises, and what to wear on your feet.

What you can do at home

• Rest it relatively: cut back what provokes it and stay active in other ways.
• In the first five to seven days of a flare-up, hold an ice pack wrapped in a damp towel on it for 10 to 20 minutes, two or three times a day.
• Wear supportive trainers or hiking boots with a slight heel, and avoid hard, flat or unsupportive footwear.
• Sort activities into green, amber and red by how much pain they cause, and keep your exercises mostly in the green, during the exercise and for the two days after.
• Losing weight if you are overweight, and stopping smoking, may help it heal.

How long it takes, and whether it comes back

Most people improve within three months of following this kind of advice, and some take up to a year. Flare-ups along the way are normal and usually settle within about six weeks. Left untreated, the tendon can tear, and weak peroneal tendons can lead to an ankle sprain or an ankle that keeps giving way.

Peroneal tendonitis treatment in Kitchener, Waterloo and Cambridge

Kitchener. Physiotherapy in Kitchener, Chiropractic in Kitchener and Kinesiology in Kitchener. Locations: Victoria North, Fischer-Hallman, Westmount East and Deer Ridge.

Waterloo. Physiotherapy in Waterloo, Chiropractic in Waterloo and Kinesiology 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 peroneal tendonitis or an ankle sprain?

A sprain is a torn or twisted ligament, an injury that happens in one moment. Peroneal tendonitis usually builds gradually, with no specific injury, and hurts just behind the outer ankle bone. The two overlap, because peroneal tendon problems are a recognized cause of pain that lingers after a sprain. See Ankle Sprains.

Can I keep running with peroneal tendonitis?

Cut back until the pain improves, which usually takes several weeks, and cross-train in the meantime. Then return very slowly, with pain as the guide.

Will insoles help?

They may, particularly if your heel turns inward. Insoles are a second step in both Scottish pathways; NHS Borders brings them in when six weeks of footwear advice has not helped. See custom orthotics.

How is it different from posterior tibial tendonitis?

The side of the ankle. The peroneal tendons run behind the outer ankle bone; the posterior tibial tendon runs behind the inner one and holds up the arch. See Posterior Tibial Tendonitis.

Where can I get peroneal tendonitis treated in Cambridge?

Start with Physiotherapy in Cambridge, at our Hespeler Road location. 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

• van Dijk PA, et al. The ESSKA-AFAS international consensus statement on peroneal tendon pathologies. Knee Surgery, Sports Traumatology, Arthroscopy, 2018.
• American Orthopaedic Foot & Ankle Society. What Is Peroneal Tendinosis? FootCareMD.
• NHS Greater Glasgow and Clyde. Persistent lateral ankle. MSK Foot and Ankle pathway, reviewed January 2026; next review due January 2027.
• NHS Borders. MSK Peroneal tendinopathy (lateral ankle pain). RefHelp, reviewed May 2024; its next review was due in May 2026.
• NHS Lanarkshire. Peroneal Tendinopathy. Undated; last modified March 2023.
• Martin RL, Davenport TE, Fraser JJ, et al. Ankle Stability and Movement Coordination Impairments: Lateral Ankle Ligament Sprains Revision 2021. Clinical practice guideline, Journal of Orthopaedic & Sports Physical Therapy, 2021.
• NHS. Tendonitis. Reviewed June 2023; its next review was due in June 2026.
• NHS. Ankle pain. Reviewed November 2025.
• NHS. Sprains and strains. Reviewed April 2024.
• MyHealth Alberta. Foot Pain: Care Instructions. Current as of July 2024.
• Diabetes Canada Clinical Practice Guidelines Expert Committee. Foot Care (chapter 32). 2018 Clinical Practice Guidelines.
• College of Chiropractors of Ontario. Standard of Practice S-006: Ordering, Taking and Interpreting Radiographs. Amended November 2023.

Related conditions

Ankle Sprains
Posterior Tibial Tendonitis
Tendonitis
Stress Fractures
Foot Pain

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