Health condition · Clinically reviewed
Chronic ankle instability, recurrent sprains and giving way — bracing, prehab and Broström repair.
It starts with an ankle sprain that never fully heals. You get repeat sprains, the ankle gives way, and it never quite feels solid again. Structured rehab and balance work fix most cases. When they don’t, a keyhole Broström-Gould repair usually does.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced from guidance
Every claim is checked against BOFAS, NICE MSK and peer-reviewed sources you can see at the end.
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Current for 2026
Reflects current UK guidance on rehab, bracing, proprioception and arthroscopic-assisted Broström repair.
Key facts
Chronic ankle instability at a glance.
The essentials, in plain English — what chronic ankle instability is, why sprains keep happening, and what the evidence says actually helps.
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Definition
A loose ankle and a wobbly one — the ligament is stretched, and the balance control never came back — after a sprain that didn’t fully heal.
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Follows acute sprain
Roughly 20–40% of acute lateral ankle sprains progress to chronic instability if rehab is inadequate.
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Mechanical vs functional
Distinguish mechanical instability (true ligament laxity on testing) from functional instability (proprioceptive deficit and neuromuscular control loss).
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Rehab is core
Peroneal strengthening and wobble-board / balance-board proprioception training remain the cornerstone of non-operative care.
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When to image
MRI plus stress imaging (weight-bearing X-ray, sometimes stress views) guides surgical planning in refractory cases.
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Gold-standard surgery
Modified Broström-Gould repair with arthroscopic assessment is the gold-standard operation for refractory chronic lateral ankle instability.
Why this guide matters
Rehab first, surgery when it is really needed.
Chronic ankle instability usually improves substantially with proper rehab — this guide sets out that order so nobody rushes into surgery before a real rehab trial.
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Proprioception is the lever
Wobble-board and balance retraining outperforms any single passive treatment for functional ankle instability.
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Bracing helps, both ways
A lace-up or semi-rigid brace reduces recurrent sprain risk during rehab and for higher-risk activity long-term.
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Broström-Gould when rehab stalls
Modified Broström-Gould repair, ideally with arthroscopic assessment, is the gold-standard operation for refractory instability.
How the diagnosis is made
From recurrent sprain to a clear plan.
The steps a UK GP or MSK clinician will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
History and clinical instability tests
Phase 2 · Confirming
Weight-bearing X-ray, MRI and peroneal assessment
Phase 3 · Managing
Rehab first, surgical review if refractory
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Recognising
Prior sprain history
Careful history of the index sprain, subsequent episodes of giving way and any repeat injuries — the diagnosis is largely clinical.
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Recognising
Anterior drawer test
Assesses anterior talofibular ligament (ATFL) integrity — a positive test suggests mechanical laxity of the lateral ligament complex.
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Recognising
Talar tilt test
Assesses combined ATFL and calcaneofibular ligament (CFL) integrity — increased tilt suggests more extensive lateral ligament disruption.
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Confirming
Weight-bearing X-ray
Excludes bony injury, osteochondral lesions and early ankle arthritis — a routine part of the workup in symptomatic instability.
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Confirming
MRI ankle
Characterises ligament tears, osteochondral lesions of the talus, peroneal tendon pathology and syndesmotic injury.
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Confirming
Peroneal function assessment
Formal strength and proprioception testing — often via physiotherapy — quantifies functional deficit and guides rehab.
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Managing
Foot & ankle surgery consultation
For refractory cases after a proper rehab trial — surgical assessment for modified Broström-Gould repair with arthroscopic assistance.
Typical timeline: 3–6 weeks from first appointment to a settled rehab plan.
Symptoms
What chronic ankle instability actually feels like.
The pattern is more telling than any single symptom — recurrent sprains, unexpected giving way, and a lingering distrust of uneven ground.
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Giving way of ankle
A sudden, unpredictable sense that the ankle rolls or gives way — the hallmark symptom of chronic ankle instability.
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Recurrent sprains
Repeat lateral ankle sprains, often on minor uneven ground — a pattern of injury rather than a single event.
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Persistent swelling
Low-grade, chronic swelling around the lateral ankle that never fully settles between episodes.
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Fear of uneven ground
Avoidance of trails, kerbs and uneven surfaces — a functional consequence of unreliable ankle control.
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Lateral ankle pain
Persistent ache over the lateral ligament complex, often worse after activity or long walks.
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Positive instability tests
Positive anterior drawer or talar tilt on clinical examination confirms mechanical laxity.
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Failed physio rehab
Ongoing instability despite a proper 3–6 month course of structured peroneal strengthening and proprioception training.
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Red flag
Acute recurrent sprain with locking or a mechanical block — consider an osteochondral lesion of the talus, and arrange urgent imaging.
Treatment
How chronic ankle instability is treated in the UK.
A staged approach — bracing and structured rehab first, with modified Broström-Gould repair (open or arthroscopic) reserved for refractory cases.
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Ankle brace / lace-up support
Semi-rigid or lace-up ankle brace to reduce recurrent sprain risk — useful during rehab and for higher-risk activity.
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Structured physiotherapy
Progressive, supervised rehab programme targeting strength, balance and functional return — the backbone of non-operative care.
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Peroneal strengthening
Targeted strengthening of the peroneal tendons to restore active lateral ankle control and reduce reliance on ligament restraint.
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Wobble-board / proprioception program
Balance-board and proprioception retraining — the single most evidence-backed component of functional rehab.
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Kinesiotaping
Adjunctive taping for symptomatic support and proprioceptive feedback during sport and higher-load rehab.
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Modified Broström-Gould repair (open)
Anatomic repair of the ATFL and CFL, reinforced with inferior extensor retinaculum — the gold-standard operation for chronic lateral instability.
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Arthroscopic Broström (all-inside)
Minimally invasive all-inside anatomic repair with arthroscopic joint assessment — allows treatment of associated intra-articular pathology in the same sitting.
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Anatomic tendon reconstruction (revision)
Tendon graft reconstruction — reserved for failed Broström repair, poor-quality native tissue or hyperlaxity syndromes.
What this guide is based on
The sources behind every claim on this page.
UK national guidance and specialist society standards, current at the time of last review.
Key references
Guidelines and standards we relied on.
A quiet reminder
This guide is for information, not medical advice.
Your GP, physiotherapist or foot and ankle team knows your history and can tell you which parts apply to you. If in doubt, get seen.
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British Orthopaedic Foot and Ankle Society (BOFAS). Clinical standards for lateral ankle ligament reconstruction.
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NICE. Musculoskeletal guidance on ankle sprain and instability.
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American Orthopaedic Foot & Ankle Society (AOFAS). Position statements on chronic ankle instability.
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International Ankle Consortium. Consensus statements on diagnosis and rehab of chronic ankle instability.
Red flags
When ankle instability is more than a ligament problem.
Most chronic ankle instability is a lateral ligament problem that responds to rehab. These are the situations where a different diagnosis needs to be considered.
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Osteochondral lesion of talus
Mechanical symptoms — catching, locking, deep ankle pain — after recurrent sprain suggest an osteochondral lesion needing MRI and specialist review.
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Peroneal tendon tear
Persistent lateral ankle pain with weakness in eversion may reflect a peroneal tendon tear rather than pure ligament instability.
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Missed syndesmotic injury
High ankle pain, pain on external rotation stress and a wide medial clear space suggest a missed syndesmotic (high ankle) injury.
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Subtalar instability
Instability that does not settle with lateral ligament reconstruction may reflect a subtalar component — needs specialist reassessment.
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Charcot ankle
In people with diabetes, a hot, swollen, unstable ankle without a clear injury needs urgent diabetic foot team review to exclude Charcot arthropathy.
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Post-op wound complication
Increasing wound pain, redness, discharge or wound breakdown after Broström repair — contact the surgical team the same day.
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Nerve injury (superficial peroneal)
Numbness or burning over the dorsum of the foot after surgery may reflect superficial peroneal nerve irritation or injury — flag to your surgeon.
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Failed Broström
Recurrent instability after anatomic repair may need revision surgery, often with tendon reconstruction — specialist reassessment is required.
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Complex regional pain syndrome
Disproportionate burning pain, swelling and colour change after surgery — early recognition and referral to a pain team improves outcomes.
Living with it
A frustrating condition, but a very treatable one.
Four things that make the biggest difference day to day — rehab, bracing, graded load and honest reassessment.
A quiet reminder
Consistency beats intensity, every time.
Balance and strength work done for a few minutes most days — kept up for months — beats a heroic week that does not last.
- 01 Rehab
Do the balance work, daily
Peroneal strengthening and wobble-board work done consistently over months — the single biggest lever for functional recovery.
- 02 Bracing
Use a brace for higher risk
A lace-up or semi-rigid brace for sport, hiking and uneven ground reduces recurrent sprain risk during and after rehab.
- 03 Load
Return to sport gradually
Progress load through the rehab pyramid — walking, running, cutting and sport-specific drills — rather than jumping straight back.
- 04 Reviews
Reassess at 3–6 months
Reassess after a proper trial of structured rehab — if instability persists, consider foot and ankle surgical review rather than more of the same.
Frequently asked
Everything we get asked about chronic ankle instability.
Quick answers on rehab, bracing, proprioception, Broström repair and recovery timelines.
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What actually causes chronic ankle instability?
It follows incomplete recovery from a lateral ankle sprain — a combination of ligament laxity (mechanical) and proprioceptive / neuromuscular deficit (functional). Around 20–40% of acute sprains progress to chronic instability when rehab is inadequate.
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How is it diagnosed?
The diagnosis is largely clinical — a history of recurrent sprains and giving way, combined with positive anterior drawer and talar tilt tests. Weight-bearing X-ray and MRI are used to characterise associated pathology and plan surgery if needed.
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Do I really need surgery?
Most people improve substantially with a proper 3–6 month course of structured physiotherapy focused on peroneal strengthening and proprioception. Surgery is reserved for refractory instability that has failed a genuine rehab trial.
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What operation is offered?
The gold-standard operation is a modified Broström-Gould anatomic repair, increasingly performed with arthroscopic assessment of the joint. All-inside arthroscopic Broström techniques allow the surgeon to treat associated intra-articular pathology in the same sitting.
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How long is recovery after Broström repair?
Typical protocols involve a short period of immobilisation, then a graduated brace and rehab programme over 3–6 months, with a return to full sport usually around 4–6 months depending on the sport and progress.
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What is the red flag I should not ignore?
An acute recurrent sprain with locking or a mechanical block should not be dismissed — it can indicate an osteochondral lesion of the talus and needs urgent imaging and specialist review.
Related content
Keep reading.
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Ankle sprain
Acute lateral ankle sprain — the injury that starts it.
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Ankle arthritis
Long-term joint change after recurrent instability.
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Foot MRI
MRI of the ankle and foot for ligament and OCL work-up.
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