[Diagram: peroneal tendon anatomy — pending re-upload]
Peroneal tendinopathy — inflammation and degenerative change of the peroneus longus and brevis tendons at the lateral ankle
Peroneal tendinopathy is a condition involving pain, inflammation and degenerative change in one or both of the peroneal tendons — the peroneus longus and peroneus brevis — which run together behind the lateral malleolus (outer ankle bone) before diverging to attach to different points on the foot.
These tendons are the primary evertors of the foot and play a critical role in lateral ankle stability, push-off during walking and running, and the absorption of load during landing. When overloaded — through sudden increases in training, repetitive ankle inversion stress or poor biomechanical control — the tendons develop a reactive and then degenerative response that produces persistent lateral ankle and hindfoot pain.
Peroneal tendinopathy is particularly common in runners, dancers and those who have sustained recurrent ankle sprains. It is frequently confused with a chronic ankle sprain and can go undiagnosed for months without specific clinical assessment.
Attaches to the base of the fifth metatarsal on the outer edge of the foot. The more commonly injured of the two tendons. Runs in the retrofibular groove behind the lateral malleolus and is particularly vulnerable to longitudinal splitting tears and subluxation. Pain typically localises directly behind and below the lateral malleolus and at the fifth metatarsal base.
Runs behind the lateral malleolus then crosses under the foot to attach to the first metatarsal base and medial cuneiform — stabilising the first ray and supporting the arch during push-off. Tendinopathy of the peroneus longus produces pain running beneath the outer foot, and is particularly associated with high-arched (cavus) feet and a history of ankle instability.
Common Causes
Sudden increase in running volume or intensity
Repetitive lateral ankle sprains
Chronic lateral ankle instability
High-arched (cavus) foot — increased lateral loading
Excessive supination or underpronation
Running on cambered or uneven surfaces
Worn or unsupportive footwear
Return to sport too quickly after ankle sprain
Dance — particularly repetitive demi-pointe work
Symptoms
Pain behind or below the outer ankle bone
Tenderness along the peroneal tendon line
Pain worsening with running, walking or standing
Swelling along the tendon sheath behind the ankle
Pain with resisted eversion of the foot
Stiffness and aching after rest or first thing in the morning
Clicking or snapping sensation at the ankle (subluxation)
Lateral ankle instability or giving way
Lateral ankle and outer foot pain has several potential causes. Accurate diagnosis before treatment is essential — particularly as peroneal tendinopathy is so often mistaken for a persistent ankle sprain.
Lateral Ankle Ligament Sprain
Acute ligament injury produces swelling and bruising around the lateral malleolus. Peroneal tendinopathy often coexists with or develops after ankle sprains. The key distinction is the location of tenderness — directly over the ligaments versus along the tendon line — and reproduction of pain with resisted eversion rather than passive inversion stress testing.
Sinus Tarsi Syndrome
Pain localised to the sinus tarsi — just in front of and below the lateral malleolus — with a characteristic sense of ankle instability. Distinguished from peroneal tendinopathy by the pain location (slightly more anterior), the absence of tendon-line tenderness, and confirmation by diagnostic local anaesthetic injection into the sinus tarsi.
Fifth Metatarsal Fracture
An avulsion fracture of the fifth metatarsal base — where the peroneus brevis attaches — produces acute point tenderness and is caused by sudden ankle inversion. A Jones fracture at the proximal diaphysis is a more serious injury. Both must be excluded by X-ray before treating lateral foot pain as peroneal tendinopathy, particularly following a recent ankle sprain or fall.
Cuboid Syndrome
Subluxation of the cuboid produces lateral mid-foot pain that overlaps anatomically with peroneus longus tendon pain. Distinguished by specific cuboid provocation tests and the fact that cuboid syndrome typically responds immediately to cuboid manipulation — which would not be expected to relieve peroneal tendinopathy.
Peroneal tendinopathy responds well to structured conservative management when the correct diagnosis has been made and the underlying load and biomechanical contributors are addressed. The evidence strongly supports progressive tendon loading as the cornerstone of rehabilitation. Our approach combines load management, eccentric and progressive strengthening, shockwave therapy where indicated, and biomechanical correction to achieve lasting resolution.
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Tendon-specific rehabilitationEvidence-based progressive loading programmes — not just stretching and rest. We address the cause and build tendon capacity.
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Shockwave therapy in-clinicAvailable at both Richmond and Kensington for chronic peroneal tendinopathy that hasn't responded to initial rehabilitation.
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Treadmill gait analysis with OnformIdentifying the cavus foot mechanics, supination pattern or lateral instability driving peroneal overload.
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Accurate differential diagnosisWe distinguish peroneal tendinopathy from ankle sprain, sinus tarsi syndrome and fifth metatarsal fracture before treating.
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Injection therapy availableTargeted corticosteroid injection into the tendon sheath for significant tenosynovitis — used selectively alongside rehabilitation.
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HCPC-registered podiatristsRichmond (TW9) and Kensington (W8) — no GP referral needed.
How long does peroneal tendinopathy take to heal?
For acute or reactive tendinopathy identified early and managed correctly, significant improvement is typically seen within 6–12 weeks. Chronic or degenerative tendinopathy — particularly where the tendon has been symptomatic for months — takes longer, often 3–6 months of consistent rehabilitation to fully resolve. The single biggest factor affecting recovery time is compliance with the loading programme. Shockwave therapy can accelerate recovery in persistent cases.
Can I keep running with peroneal tendinopathy?
Often yes, with appropriate load modification. Complete rest is rarely the right answer for tendinopathy — tendons need load to stimulate repair. The goal is to identify the threshold at which symptoms are provoked and train below or at that level while rehabilitation builds tendon capacity. We provide a specific return-to-running plan with clear criteria for progression. Continuing to run through significant pain without modification will worsen the condition.
Is peroneal tendinopathy the same as a peroneal tendon tear?
No — though they exist on a spectrum. Tendinopathy describes degeneration and pain within the tendon tissue without a discrete structural tear. A longitudinal split tear of the peroneus brevis — which can develop from chronic tendinopathy or acute ankle inversion — involves a physical disruption of the tendon fibres. Significant tears may require surgical repair. Ultrasound or MRI can distinguish between tendinopathy and a structural tear where this is clinically relevant.
What is peroneal tendon subluxation?
Peroneal tendon subluxation occurs when the tendons slip out of the retrofibular groove behind the lateral malleolus — usually due to a tear or laxity of the superior peroneal retinaculum. It produces a characteristic snapping or clicking sensation at the outer ankle, often triggered by ankle dorsiflexion and eversion. Subluxation requires specific assessment and, if recurrent and symptomatic, may require surgical stabilisation. This is distinct from peroneal tendinopathy, though the two can coexist.
Does my foot shape affect my risk of peroneal tendinopathy?
Yes significantly. A high-arched (cavus) foot places greater stress on the lateral column and peroneal tendons with every step, as the foot is naturally supinated and the peroneal tendons must work harder to control inversion. People with cavus feet and a history of ankle instability are at the highest risk of peroneal tendinopathy. Custom orthotics with lateral wedging can directly reduce this load and form a key part of long-term management.
Is treatment covered by health insurance?
Yes — podiatry consultations and shockwave therapy are typically covered by most major insurers. We work with Bupa, Aviva, WPA and others. See our
insurance page for full details.
