Peroneal Tendinopathy
Peroneal tendinopathy is pain in the tendons that run behind and below the bony bump on the outside of the ankle. These tendons help steady the ankle, and the problem often follows earlier ankle sprains. Pain usually builds gradually and is worse with activity, such as walking on uneven trails or pushing off when running.
Key points
- What usually helps
- Loading the tendons step by step, with balance training to steady the ankle.
- What you can do now
- Push the foot outward against a wall. Practise standing on one leg.
- How long it takes
- Improvement often takes weeks to months.
- When to see a doctor first
- Some signs need emergency care. Check the list before you start treatment.
Symptoms
Does this sound like you?
- Pain along the outside of the ankle, especially behind and below the bony bump on the outer ankle (the lateral malleolus)
- Pain that worsens with activity, especially walking on uneven surfaces or pushing off during running
- Tenderness when the tendons behind the outer ankle bone (the peroneal tendons) are pressed
- Pain when you turn the foot outward against resistance (resisted eversion)
- Stiffness and pain after periods of rest, particularly in the morning
Often alongside it
- Swelling along the tendon pathway
- Sensation of ankle instability or 'giving way'
- Difficulty with single-leg standing or balance activities
- Changes in how the hip or knee move to make up for the ankle
- History of recurrent ankle sprains
I typically see people with a history of ankle sprains who develop pain on the outside of the ankle that comes on gradually. Many describe difficulty with activities like hiking on trails or sports requiring quick direction changes. The pain often improves with rest but returns quickly when activity resumes.
Before using this comparison, check when these symptoms need a doctor first.
When to see a doctor first
Go to emergency
Fever, red streaking, or a hot, badly swollen ankle
Go to emergency now to rule out an infection
Get seen today
Sudden severe pain and inability to bear weight after a fall or twist
Go to urgent care or emergency to rule out a fracture or tendon rupture
Weakness turning the foot outward that keeps getting worse, or a dropping foot
Same-day medical assessment for a tendon tear or nerve problem
Check with your doctor
No improvement after 12 weeks of appropriate conservative treatment
I flag it to your family doctor, who can arrange imaging and an orthopaedic opinion
Treatment
How it is treated
Main approach. Loading the tendons with exercise that builds up step by step, combined with training to steady the ankle, can help. Treating any underlying unstable ankle matters for the longer term, though research specific to peroneal tendon pain is limited.
Alongside it. Slow lowering (eccentric) and heavier strengthening exercises build how much load the tendons can take, while balance training targets the loss of control that often comes with an unstable ankle.
Managing it over time. Rehabilitating ankle sprains well, including balance training, may lower the chance of later peroneal overload.
A typical rehabilitation progression
Three phases, from settling symptoms to returning to full activity.
Recovery from peroneal tendinopathy is usually staged: calm the symptoms first, then rebuild the strength and capacity of the area, then return to your full activities. The phases below show how that can progress.
Phase 1Calming the Tendon and Reclaiming Balance (Weeks 1 to 4)
Bring day-to-day symptoms down to a workable level, and start to restore how well the muscles on the outside of the lower leg (peroneals) switch on, which usually lags in an ankle left unstable by sprains. Pushing the foot outward against something solid without moving it ( ) is the main loading exercise, because it loads the tendon heavily without the repeated lengthening and shortening that often irritates it early on. Balance work rebuilds the sense of position () the outer ankle has lost, given the delayed switching on of these muscles found in research on chronic ankle .
Example exercises
- Pushing the outside of the foot against a wall or a firmly anchored band without moving it (isometric eversion), 5 sets of 45 seconds at a moderate effort, once a day
- Seated, turning the foot outward against a band through its range of movement, 3 sets of 12 to 15, slowly
- Single-leg balance on firm ground, eyes open, progressing to eyes closed, 3 sets of 30 seconds
- Calf raise variations on flat ground, 3 sets of 12, so the calf muscles share the load
- Adjusting activity: cut running on uneven ground and hills by roughly 50 percent, and keep your volume on flatter surfaces
Possible progression milestones
Possible milestones, adapted to the person rather than treated as fixed cut-offs: the outward push holds (isometric eversion) comfortable over several days, steady single-leg balance on firm ground, and no symptom rise 24 hours after loading sessions.
Phase 2Heavier Loading and Less Stable Surfaces (Weeks 4 to 10)
Build peroneal strength through the full movement and add less stable surfaces step by step. Load that builds up over time is the common thread in tendon rehab, and here it pairs naturally with balance retraining for the underlying unstable ankle (chronic ankle instability). Some discomfort during loading is acceptable, provided it settles within 24 hours and does not climb from week to week.
Example exercises
- Heavy, slow outward turns of the foot against a long band or cable, 3 sets of 6 to 10 repetitions, 3 seconds out and 3 seconds back, 3 times per week
- Slow lowering outward turns ( eversion) with extra resistance applied by hand, focusing on a slow return from the turned-out position, 3 sets of 8 to 10
- Single-leg calf raise with the heel off a small step, 3 sets of 8 to 12, with control on the way down
- Single-leg balance on a foam pad (such as an Airex), reaching in several directions, 3 sets of 8 per direction per side
- Walking lunges and lateral step-ups to load the foot in functional positions, 3 sets of 8 to 10
Possible progression milestones
Possible milestones, adapted to the person rather than treated as fixed cut-offs: heavy, slow outward turns tolerated with low pain, a solid set of full-range single-leg heel raises per side, stable balance on foam with eyes closed, and loading sustained over several weeks without a 24-hour flare.
Phase 3Return to Rough Ground, Changing Direction and Sport (Months 3 to 6)
Restore the quick, reactive steadiness the peroneal tendons need to provide on uneven ground and in sport. Hopping, changing direction and landing rebuild the spring-like function the tendon needs, and trail or court surfaces are brought back gradually rather than all at once. This phase also builds on the balance work, since the highest risk of it coming back is in people who return to sport with the tendon settled but the ankle still not ready.
Example exercises
- Small, springy two-leg hops (pogo hops), progressing to single-leg hops in place on firm ground, 3 sets of 15 to 20
- Lateral hop-and-stick onto the affected leg, 3 sets of 8, with a 2-second hold on landing
- Change-of-direction (cutting) drills starting at 45 degrees and progressing to 90, at less than full effort first, then full effort
- Graded return to trail, hill, or uneven-surface training, increasing volume in small weekly steps
- Sport-specific reintegration, such as change of direction drills for soccer or court sports, in blocks with full recovery between
Possible progression milestones
Possible milestones, adapted to the person rather than treated as fixed cut-offs: single-leg hopping close to the unaffected side, return to previous training volume and terrain without next-day flares, scores on the sport section of an ankle questionnaire (FAAM) trending toward pre-injury levels, and full training sustained over several weeks without a symptom rise.
What you can do now
- Push the foot outward against a wall. With the outside of the foot against a wall, push outward without moving it, at a moderate effort, for 45 seconds; do 5 holds once a day. This loads the tendons heavily without the repeated movement that often irritates them early on.If weakness turning the foot outward keeps getting worse, or the foot starts to drop, get a same-day medical assessment.
- Practise standing on one leg. Stand on the sore leg on a firm floor for 30 seconds, 3 times, with your eyes open, then progress to eyes closed. A steadier ankle may reduce the demand on the peroneal tendons during daily activities.Move on to a foam pad or other wobbly surface only once balance on firm ground is steady.
- Trim your running and trail time. Cut your weekly running by around a third, swap uneven trails for flatter surfaces for a few weeks, and space runs at least 48 hours apart, with hills, trails and speed work coming back last. Aim for pain during activity that stays moderate, settles within 24 hours and does not build from week to week.If pain keeps climbing during runs, or morning stiffness lasts noticeably longer than usual, scale back for a week or two. These are example limits, not proof that running is safe for every cause of pain.
- Wear a lace-up brace for riskier activity. In the short term, a lace-up brace during trail runs, basketball or hiking reduces the twisting force that rolls the ankle inward and strains the tendons, and often lets you keep training. It does not weaken the ankle as long as your exercises keep building strength underneath it.
- Keep the ankle moving in every direction. Gentle movement and stretching within a comfortable range help avoid stiffness that could change how the foot loads the tendons.
What I use in clinic
- Progressive tendon loading. Rehab that builds the peroneal tendons' strength and tolerance to load shows improvement, though the evidence is limited.
- Balance and stability training. Balance training can reduce repeat ankle sprains; evidence specific to the peroneal tendons is limited.
- Strengthening through the full movement (eccentric and isotonic). Gradual strengthening with a resistance band, including slow lowering (eccentric) exercises, supports the tendon rebuilding, though evidence specific to the peroneal tendons is limited.
- Hands-on treatment and joint mobilization. May help ease ankle stiffness and improve how the ankle moves, though evidence specific to peroneal tendinopathy is limited.
Recovery
How long it takes
Improvement often takes weeks to months with an appropriate loading program, and longer-standing cases can take longer.
Many cases improve with non-surgical care, particularly when any underlying unstable ankle is treated. The research specific to peroneal tendon problems is sparse. If it does not improve, imaging and a surgical opinion may be needed, arranged through your family doctor.
What changes the timeline
- How long you have had symptoms: longer-standing cases take longer to recover
- Treating an underlying unstable ankle improves outcomes
- Consistency with the loading program
- How the foot is shaped and moves, such as foot posture, influences recovery
- How much your activities and sport ask of the ankle
How I track it. I monitor your pain when you are on your feet, how your single-leg balance improves, how steady the ankle is during everyday movements, and whether you can do the activities that used to bring on symptoms
Similar conditions
Conditions that can feel similar
- Chronic Lateral Ankle Ligament Injury or Instability
- Pain sits over the ligaments on the outside of the ankle joint (the anterior talofibular or calcaneofibular ligaments), with a history of one clear sprain and a feeling that the ankle gives way on uneven ground. Turning the foot outward against resistance does not hurt the tendons, and the tenderness does not run behind and below the outer ankle bone the way it does with tendinopathy. The two often occur together, so the question is which one is driving the symptoms now.
- Peroneal Tendon Tear or Subluxation
- A snap you can feel, or the tendons flicking over the back of the outer ankle bone as you turn the foot outward, points to the tendons slipping out of place (subluxation) rather than straightforward tendinopathy. A sharp rise in pain with one particular cutting or landing movement, swelling that persists, and a tendon that feels thickened with a small dip in it raise concern for a split or partial tear, and make imaging worth considering sooner.
- Lateral Ankle Bone Stress Injury
- Tapping on the bone, or squeezing the outer leg bone (fibula), brings on the pain, while turning the foot outward against resistance does not. Pain on your feet does not ease with a warm-up, and pain at night or at rest is more common. A recent quick build-up in running or hiking, or a sudden spike in load such as one long day on rough ground, raises suspicion.
- Sinus Tarsi Syndrome
- Pain sits in the small hollow just in front of the outer ankle bone, and is worst on uneven ground and when landing from a hop with the foot turned outward. The peroneal tendons are not tender, and turning the foot outward against resistance is comfortable. A history of repeated ankle sprains with lasting discomfort on the outside of the ankle is typical.
- Sural Nerve Irritation
- The pain burns or tingles and follows the outer edge of the foot rather than sitting in the tendon. Light tapping over the nerve behind the outer ankle bone brings on the symptoms, while turning the foot outward against resistance and loading the tendon do not. Tight boot tops or a previous surgical scar are common contributors.
- Cuboid Syndrome
- Deep pain on the outer midfoot rather than behind the outer ankle bone, often with a sense of something clunking or locking when pushing off. Pressing up under the cuboid (a small bone on the outer midfoot) from the sole brings on the symptoms. Pressing on the peroneal tendons is usually comfortable, and turning the foot outward against resistance is not what mainly brings it on.
Questions
What patients ask me most
Why does the outside of my ankle hurt if I did not roll it recently?
A history of rolled ankles years ago still matters. Once the ligaments on the outside of the ankle have been stretched, the peroneal tendons take on more of the stabilising work during walking and running, particularly on uneven ground. Over time that extra demand can overload the tendons even without a fresh sprain. This is why peroneal tendinopathy and chronic ankle instability so often travel together, and why rehab has to address both the tendon and the underlying instability rather than only the painful side.
How long does peroneal tendinopathy usually take to settle?
Improvement often takes weeks to months, and a full return to running, hiking, or cutting sports can take a few months. Cases that have been grumbling for over a year, or that have developed on a background of untreated ankle instability, often take longer. Research cannot reliably rank the main predictors for one person; ankle stability, activity demands, and how the tendon responds to loading help guide the plan.
Should I rest completely, or keep moving?
Complete rest is rarely the answer. The tendon needs load to remodel, and long periods off just delay the conversation. Many people do better on a modified plan: reduce the aggravating volume, swap uneven-terrain running for flatter surfaces for a few weeks, and add a specific peroneal loading program twice weekly. One way to judge the dose: pain during activity stays moderate, settles within 24 hours, and does not build from week to week. These are example monitoring limits, not proof that running is safe for every cause of pain, so the plan is adjusted to how your tendon responds.
Do orthotics help peroneal tendinopathy?
They can, particularly when the foot habitually sits tilted onto its outer edge (chronic inversion), or when a long-standing high-arched (cavus) foot is overloading the outer side of the foot. A wedge or flare along the outer edge of the orthotic takes load off the peroneal tendons while you stand and walk. Orthotics are a support, not a cure. I use them as a bridge while strengthening rebuilds capacity, not as a long-term substitute for the loading program.
What is the difference between peroneal tendinopathy and an ankle sprain that just will not heal?
A typical outer ankle sprain irritates the ligament at the front of the joint (the anterior talofibular ligament), and symptoms usually centre on a specific spot just below the bony bump on the outside. Peroneal tendinopathy sits behind and below that bump, travels down the outer foot, and is reliably brought on by turning the foot outward against resistance. Sprains that do not settle after 6 to 8 weeks often have a peroneal component that has been missed, and the rehab needs to shift toward tendon loading rather than the exercises used early after a sprain.
Can I keep running with peroneal tendinopathy?
Usually yes, with adjustments. Dropping weekly mileage by around a third, running on flatter surfaces temporarily, and spacing runs at least 48 hours apart gives the tendon time to adapt. Hills, trails, and speed work come back last. If pain keeps climbing during runs, or morning stiffness is lasting noticeably longer than usual, the loading has probably outpaced the tendon and the plan needs to scale back for a week or two.
Is an ankle brace a good idea, or does it make me weaker?
In the short term, a lace-up brace during higher-risk activity, such as trail runs, basketball, or hiking, reduces the twisting force that rolls the ankle inward and strains the tendon and often allows training to continue. It does not weaken the foot provided rehab keeps building strength underneath it. The brace is a partner to the loading program, not a replacement. Most people phase it out once tolerance is back and balance work is consistent.
The science
The Science of Peroneal Tendinopathy
Peroneal affects the fibularis longus and brevis tendons that run behind your lateral malleolus (outer ankle bone). These tendons are crucial for ankle stability, particularly during walking on uneven surfaces, and help prevent ankle sprains by providing lateral stability.
The peroneal tendons are subject to significant mechanical stress as they navigate around the sharp posterior edge of the fibula, held in place by the superior peroneal . This anatomical arrangement makes them vulnerable to friction and changes, particularly when the retinaculum is damaged or when there are underlying biomechanical issues.
Tendinopathy develops when the cumulative load on these tendons exceeds their adaptive capacity. This leads to a failed healing response characterized by disorganized , increased ground substance, and . The result is a painful, thickened tendon with reduced mechanical properties.
The condition often develops in conjunction with chronic ankle , where recurrent ankle sprains lead to peroneal muscle weakness and altered . Research shows that individuals with chronic ankle instability demonstrate reduced and delayed activation of peroneal muscles, creating a cycle where weak peroneals increase ankle instability, leading to further tendon stress and degeneration. This relationship helps explain why peroneal tendinopathy and chronic ankle instability so often occur together.
Contributing factors
Your peroneal muscles serve dual roles as foot everters and ankle lateral stabilizers. The fibularis longus also supports your medial longitudinal arch, while the fibularis brevis provides dynamic stability against ankle .
During the stance phase of walking, your peroneal muscles work eccentrically to control inversion and provide lateral stability. On uneven surfaces or during cutting movements in sports, these demands increase dramatically, making the tendons vulnerable to overuse injury.
The peroneal tendons must navigate a sharp turn around the lateral malleolus, similar to a rope moving around a pulley. This creates high friction forces, especially when ankle motion increases or when there are anatomical variations like a prominent peroneal tubercle.
When ankle is impaired following sprains, the peroneal muscles must work harder to provide conscious and subconscious stability. This increased demand, combined with potential weakness from previous injuries, makes more likely.
Research
What the studies show
After an ultrasound-guided steroid injection into the peroneal tendon sheath, about a third of patients reported relief lasting more than 12 weeks
In a study that looked back at the records of 96 patients (109 injections) by Fram and colleagues (2019), 36.8% of those who answered reported relief lasting longer than 12 weeks, while 43.7% had relief for a week or less. Two complications were reported (1.8%), and a quarter of patients went on to surgery.
An injection from a physician is one option when loading and stability work have not settled the tendon, with variable results; it does not replace rehabilitation.
Fram BR, Rogero R, Fuchs D, et al. Clinical Outcomes and Complications of Peroneal Tendon Sheath Ultrasound-Guided Corticosteroid Injection. Foot Ankle Int. 2019;40(8):888-894. PMID: 31068007.
Related Conditions
Conditions I commonly see alongside, or confused with, this one.
IT Band Syndrome
Both involve lateral structures; ankle dysfunction can affect entire lateral chain
Shin Splints
Both involve lower leg overuse; shared biomechanical factors in athletes
Plantar Fasciitis & Heel Spurs
Peroneal dysfunction affects foot mechanics and can contribute to plantar fasciitis
Achilles Tendinopathy / Tendinitis
Posterior Tibial Tendon Dysfunction
Getting back to it
Physiotherapy for peroneal tendinopathy, built around the activity you want back.
