Ankle

Peroneal Tendinopathy

Q: How do you fix peroneal tendinopathy?

Mostly without surgery: reduce activity enough to let it settle, strengthen on a flat surface rather than a step, wear supportive footwear, and rebuild balance. Anti-inflammatories and an insole may help. Be aware these recommendations rest mainly on case series and expert opinion.

Q: What does peroneal tendinopathy pain feel like?

Pain, and sometimes swelling, on the outside of the ankle, usually just behind or below the outer ankle bone. It’s typically worse with activity and better with rest, and you may notice weakness pushing with the outside of your foot.

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The pain sits on the outside of your ankle, just behind and below the bony bump on that side. It's worse after a walk or a run and eases when you rest. Often there's an ankle sprain somewhere in the story (sometimes several), and a feeling that the ankle never quite came right after the last one. That's a familiar picture of peroneal tendinopathy, which a lot of people know as peroneal tendonitis.

What's actually causing it

A tendon is the tough cord that joins a muscle to bone. Your two peroneal muscles run down the outside of your lower leg, and their tendons pass behind the bony bump on the outside of your ankle: the lateral malleolus, the lower end of your fibula ^2,4.

They do two jobs. They turn your foot outwards, with one of them, the peroneus brevis, providing 63% of that power ³. And they're the first muscles to switch on when your ankle suddenly rolls inwards, which makes them central to keeping the outside of the ankle stable ³.

That's where sprains come in. A sprain can injure the tendons directly ². And a sprain that wasn't fully rehabilitated tends to leave the peroneal muscles weaker, with a reduced sense of where your foot is in relation to your leg, part of why sprains recur ¹. Peroneal problems turn up often in people whose ankles keep giving way, and in people with a high-arched foot that tilts the heel inwards ^3,4.

Other causes include repetitive or prolonged activity, a heel-bone fracture that has left the heel widened, and an enlarged bony ridge on the outer heel that the tendons run past ³.

One honest note. Two explanations you may hear stated as fact (that the peroneals switch on too slowly after a sprain, and that the tendon has poor-blood-supply "zones" where it breaks down) are still debated. The first has studies both supporting and refuting it; the second has been refuted and remains a subject of debate ³.

Outer lower leg and ankle showing the two peroneal tendons curving behind the outer ankle bone, shown irritated

Peroneal tendinopathy or an ankle sprain that hasn't settled? How to tell the difference

This is the confusion that matters most. Both hurt on the outside of the ankle, both often start with a roll, and peroneal tendon problems are genuinely hard to tell apart from ligament injuries ³. A sudden dislocation of the peroneal tendons is misdiagnosed in up to 40% of cases, usually as a sprain ³.

Clues that point towards the tendons rather than the ligaments:

Pain and swelling just behind or below the outer ankle bone ³
Pain that builds with activity and eases with rest ³
Weakness pushing something with the outside of your foot ²
Pain when you resist turning your foot outwards, when the foot is stretched inwards, or when you push down through the big-toe side of the foot against resistance ³
Clicking over the outside of the ankle, which can mean the tendon is slipping out of its groove ²

If what you've got is a recent roll with swelling, our Ankle Sprain page is the better starting point. If the ankle keeps giving way, read about Chronic Ankle Instability too: the two frequently turn up together ³.

Scans help, but they don't settle it on their own. On ultrasound the tendon is often thickened ². MRI is less reliable than people expect: even in 238 patients already heading for ankle surgery, it missed roughly four in ten peroneal problems, and nothing in their history predicted who it would miss ⁵.

How it's diagnosed

This is worked out from your story and a hands-on examination, and the story comes first ³. Before going near the sore spot, a clinician looks at how your leg and heel line up, because a heel that tilts inwards can put extra force through the peroneal tendons ³. Then they press along the line of the tendons, check the ankle ligaments for looseness, and may ask you to circle your ankle to see whether a tendon slips out of place ³. In the peroneal compression test, you push your foot up and out hard while they feel behind the outer ankle bone for pain, grating or a pop ³.

Scans come second. A standing X-ray shows your foot shape and any bony cause, and ultrasound can watch the tendons move in real time ³.

How we treat it

First we work out whether the tendons are actually the problem. Then we settle them down, and rebuild the strength and control that protect them.

Assessment first. Where the pain sits, the resisted-movement tests above ³, a check for clicking ², and a look at your sprain history and foot shape ^3,4.

Settle the load, don't just stop. Reducing activity enough to let symptoms settle is part of the standard advice ². We use how your ankle responds to find a level of walking and training you can keep doing while it recovers.

Sports physiotherapy: strength and balance. Rehab typically starts with range of motion and moves on to exercises that load the tendon, with peroneal strengthening and balance work ⁴. Balance work on a wobble board targets the lost sense of foot position that sprains leave behind ¹.

Exercises on flat ground, not a step. This one surprises people. Doing these exercises on a step won't help and may make things worse, because it increases compression between the tendon and the outer ankle bone ².

Footwear and insoles. Supportive footwear helps ². An insole with a small wedge under the outer forefoot is one option in milder cases ³. And if you already wear an arch support, removing it may help: it can push your foot outwards too much ².

To be clear: this is a sensible, well-reasoned approach, but the published recommendations rest mainly on case series and expert opinion, not trials ^3,4.

Other treatments we may use

Hands-on treatment.

Manual therapy can sit alongside the exercise work, but the evidence on how well conservative treatments work in this condition is limited and varied ⁴. We treat it as an adjunct, not the main event.

Medication.

Anti-inflammatories and simple pain relief are part of standard first-line care ^2,3, a conversation with your GP or pharmacist, not something we prescribe.

Corticosteroid injections.

There's too little evidence to draw conclusions about them ⁴, and they carry a risk of causing the tendon to rupture: the authors of one specialist review don't use them at their own institution for that reason ³. That decision belongs with your GP or specialist.

A boot or brace.

For more severe or stubborn cases, a short spell in a boot or brace may be used ², and in cases that don't settle, immobilisation for around six weeks ³.

Surgery.

Considered for tears, a tendon that keeps slipping out of its groove, or cases that don't respond to conservative care ^2,3. If we think you need a surgical opinion, we'll tell you.

Your recovery path: Reset, Rebuild, Return

Peroneal tendinopathy treatment follows The Well Motion Recovery Path™. You move up a phase when the tendons tolerate more load, not when a set number of weeks has passed.

Reset: for as long as the tendons stay irritable. We cut back the walking or running that flares them and sort out footwear and insoles ². A boot or brace is for severe cases only ². Expect the ache to ease before the ankle feels stronger. We move you on once everyday walking no longer builds the pain.
Rebuild: the longest phase. Range of motion first, then tendon-loading exercises ⁴ through Sports physiotherapy, kept on flat ground ², with Manual therapy alongside if it helps. Expect some days to be sorer than others. We move you on when the ankle does what your daily tasks ask of it.
Return: back to running, sport, uneven ground or a job on your feet. We test the ankle on the tasks you are going back to, at the speed you do them. You leave with a strength and balance program and footwear advice.

How long it usually takes. No study gives a reliable recovery time for non-surgical care ^3,4. The one marker comes from an expert consensus panel, which treats symptoms lasting beyond three months as the point to consider further options ⁴. That is opinion, not trial data.

Reducing your risk of it coming back

Nobody has trialled prevention for peroneal tendinopathy itself. What has been tested is preventing the ankle sprains that so often set it off, and the rest of this list goes after known causes:

Get on top of the sprains. These tendons are commonly injured during an ankle sprain ². A review of 46 reviews rated the evidence for a brace as strong, and for balance-type training as moderate, in preventing repeat sprains ⁶. If you keep rolling the ankle, that needs proper investigation and rehab ¹.
Check your shoes and your ground. Walking or running on uneven ground in worn shoes is a recognised cause ². Look at your soles before you build your distance back up, and take care on uneven or wet ground for the first few weeks after any sprain ¹.
Have your foot shape looked at. Most people whose peroneal trouble came on without an injury have a heel that tilts inwards ³. How flexible that tilt is affects whether an insole is likely to suit you ³.

When to get it checked properly

Get it assessed rather than managing it alone if:

You feel clicking or snapping over the outside of the ankle ²
Pain on the outside of the ankle hasn't settled after a sprain, especially one that was only ever called "a simple sprain" ³
Pushing outwards with your foot feels weak ²
The ankle keeps giving way ³
Pain hasn't eased with reduced activity and more supportive shoes ²

Left untreated, peroneal tendon problems can lead to persistent pain on the outside of the ankle and substantial functional problems ³. But most can be treated successfully without surgery ²: getting it checked is about catching it early, not expecting the worst.

Your first appointment

We start by listening: how it began, what makes it worse, and what it's stopping you from doing. Then we examine the area, explain what we find in plain English, and agree a plan with you. Your first visit is 40 minutes at Engadine and 30 minutes at our other clinics.

We see patients at Engadine, Mount Annan, Narellan and Appin, and at home through our mobile physiotherapy service. If you have private health cover, here's how health fund rebates work for physiotherapy.

FAQs

How do you fix peroneal tendinopathy?

Mostly without surgery ²: reduce activity enough to let it settle, strengthen on a flat surface rather than a step, wear supportive footwear, and rebuild balance ^1,2,4. Anti-inflammatories and an insole may help ^2,3. Be aware these recommendations rest mainly on case series and expert opinion ^3,4.

What does peroneal tendinopathy pain feel like?

Pain, and sometimes swelling, on the outside of the ankle ², usually just behind or below the outer ankle bone ³. It's typically worse with activity and better with rest ³, and you may notice weakness pushing with the outside of your foot ².

Is walking good for peroneal tendinopathy?

The research doesn't answer this one directly. What the advice does say: reduce activity enough to let symptoms settle, and switch to footwear that supports the ankle ². Walking on uneven ground in worn shoes is itself a listed cause ², and symptoms typically worsen with activity ³. So how much and where you walk matters: we'd rather set your limit with you than give you a generic number.

How long does peroneal tendinopathy take to heal?

The research doesn't give a reliable figure for non-surgical recovery. The timeframes you'll see quoted mostly come from surgical studies, and the evidence for conservative timelines is thin ^3,4. Recovery depends on how long it's been going, whether there's a tear, and how your ankle responds to loading.

Should you massage peroneal tendonitis?

It can be part of treatment, but don't expect it to do the heavy lifting. The evidence on conservative treatments for this condition is limited ⁴, so we use it alongside strengthening, not instead of it.

What happens if a peroneal tendon tear is left untreated?

It can lead to persistent pain on the outside of the ankle and substantial functional problems ³. That's why an outer-ankle pain that hasn't settled deserves a proper assessment, not more waiting.

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