Health condition · Clinically reviewed
Ankle sprain (lateral ligament injury), Ottawa rules, POLICE and proper rehab.
The most common musculoskeletal injury. Lateral ligament (ATFL) is usually the culprit. Ottawa ankle rules rule out fracture; POLICE (protect, optimally load, ice, compress, elevate) plus proper proprioceptive rehab prevents chronic instability.
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, Ottawa Ankle Rules and peer-reviewed sources you can see at the end.
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Current for 2026
Reflects current UK guidance on POLICE, proprioceptive rehab and modified Broström surgery.
Key facts
Ankle sprain at a glance.
The essentials, in plain English — what an ankle sprain actually is, when to worry about a fracture, and what the evidence says about POLICE and rehab.
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Definition
A lateral ligament injury — typically the anterior talofibular ligament (ATFL), sometimes the calcaneofibular ligament (CFL).
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Inversion mechanism
The classic story is an inversion twist — the foot rolls inward, stretching or tearing the lateral ligament complex.
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Ottawa ankle rules
A validated clinical rule that identifies who actually needs an X-ray — avoiding unnecessary imaging in the majority.
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POLICE has replaced RICE
Protect, Optimally Load, Ice, Compress, Elevate — early controlled loading now beats prolonged rest.
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Rehab is essential
Return-to-play needs proprioceptive rehab and peroneal strengthening — not just rest and a brace.
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Chronic instability
Around 30% of untreated or poorly rehabbed sprains progress to chronic ankle instability with recurrent giving way.
Why this guide matters
Rehab first, brace second, surgery last.
Ankle sprains are common — and commonly under-rehabbed. This guide sets out what actually reduces re-sprain risk and chronic instability.
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Ottawa rules avoid unnecessary X-rays
A validated bedside rule identifies the small subgroup that actually needs imaging — sparing most people an X-ray.
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POLICE, not RICE
Early controlled loading with protection, optimal load, ice, compression and elevation beats prolonged rest.
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Rehab prevents chronic instability
Proprioceptive and peroneal rehab cuts re-sprain and chronic instability rates — the single most important intervention.
How the diagnosis is made
From twisted ankle to a clear plan.
The steps a UK GP or emergency clinician will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
History, Ottawa rules and selective X-ray
Phase 2 · Confirming
Laxity testing and imaging for atypical cases
Phase 3 · Managing
Rehab first, surgery for chronic instability
- 01
Recognising
Symptom + mechanism history
The mechanism does most of the work — an inversion twist with immediate lateral ankle pain, swelling and difficulty weight-bearing.
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Recognising
Ottawa ankle rules
A validated bedside rule — tenderness over the malleoli, navicular or 5th metatarsal base, or inability to weight-bear, triggers imaging.
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Recognising
X-ray if Ottawa-positive
Plain X-ray to rule out lateral malleolus, navicular or 5th metatarsal avulsion fracture — the fractures most commonly missed.
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Confirming
Anterior drawer + talar tilt tests
Clinical laxity tests done once acute pain settles — the standard bedside test for ATFL and CFL integrity.
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Confirming
Ultrasound / MRI
Reserved for high-grade sprain, persistent symptoms, suspected osteochondral lesion or chronic instability workup.
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Managing
Physiotherapy assessment
A structured proprioceptive and peroneal strengthening programme — the single most useful intervention long-term.
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Managing
Foot & ankle surgery
For chronic instability that has failed rehab — modified Broström repair with a foot and ankle specialist.
Typical timeline: 2–6 weeks for daily life; longer for return to cutting sport.
Symptoms
What an ankle sprain actually feels like.
The pattern — inversion mechanism, lateral swelling, focal ATFL tenderness — is more telling than any single symptom.
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Inversion injury history
A clear story of the foot rolling inward — twisting off a kerb, landing awkwardly or sport-related contact.
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Lateral ankle swelling
Rapid swelling on the outside of the ankle within minutes to hours of the injury.
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Bruising over lateral malleolus
Bruising tracks down and forward from the lateral malleolus — sometimes into the foot over the next few days.
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Tenderness over ATFL
Focal tenderness just anterior and inferior to the tip of the lateral malleolus — over the anterior talofibular ligament.
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Antalgic gait
A limp with reluctance to fully weight-bear on the injured side — settling as swelling subsides.
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Instability / giving way
A sense that the ankle is loose or gives way — especially on uneven ground or when turning.
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Recurrent sprains
Repeated sprains from progressively lower-energy events — a strong pointer to chronic ankle instability.
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Red flag
Unable to weight-bear plus bony tenderness over the malleoli, navicular or 5th metatarsal base — X-ray urgently.
Treatment
How ankle sprains are treated in the UK.
A staged approach — POLICE and early loading first, structured proprioceptive rehab as the core, with modified Broström surgery reserved for chronic instability.
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POLICE first 48–72 hrs
Protect, Optimally Load, Ice, Compress, Elevate — the modern replacement for RICE, keeping the ankle moving safely from the outset.
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Early weight-bearing (as tolerated)
Weight-bear as pain allows from day one — prolonged rest and immobilisation worsen outcomes for most simple sprains.
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Ankle brace or tape
A lace-up brace or taping for the first few weeks — controls inversion while healing and reduces re-sprain risk.
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Proprioceptive rehab (wobble board)
Wobble-board and single-leg balance work — the single most important step in preventing chronic instability.
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Peroneal strengthening
Targeted peroneal (fibularis) strengthening — the muscles that actively resist inversion and protect the ligaments.
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Physiotherapy programme
A structured, progressive rehab programme with a physiotherapist — the backbone of long-term recovery.
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Return-to-play testing
Objective criteria — pain-free single-leg hop, balance and agility drills — before returning to sport, not a fixed timeline.
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Modified Broström surgery
Anatomic repair of the ATFL and CFL — reserved for chronic ankle instability that has failed a proper rehab programme.
What this guide is based on
The sources behind every claim on this page.
UK national guidance, validated clinical rules 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). Patient information and clinical standards.
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Ottawa Ankle Rules. Validated clinical decision rule for ankle and midfoot injuries.
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Cochrane reviews on the treatment and rehabilitation of ankle sprains.
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British Journal of Sports Medicine. Consensus statements on lateral ankle sprain and chronic ankle instability.
Red flags
When an ankle injury is not just a simple sprain.
Most ankle sprains settle with POLICE and rehab. These are the situations where a different diagnosis needs to be considered.
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Ottawa-positive fracture
Unable to weight-bear plus bony tenderness over the malleoli, navicular or 5th metatarsal base — X-ray urgently to exclude fracture.
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Syndesmotic (high) ankle sprain
Pain higher up between the tibia and fibula, positive squeeze test — a different injury with a longer recovery, often needing imaging.
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Peroneal tendon dislocation
A snapping sensation behind the lateral malleolus with dorsiflexion and eversion — needs foot and ankle review.
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Osteochondral lesion of the talus
Persistent deep ankle pain, catching or locking after a sprain — MRI to look for a chondral or osteochondral injury.
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Compartment syndrome (crush)
Severe pain out of proportion, pain on passive stretch, tense compartments after crush injury — surgical emergency.
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DVT after immobilisation
Calf swelling, warmth or pain following a period of immobilisation — assess for deep vein thrombosis, do not assume post-sprain swelling.
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Missed 5th metatarsal fracture
Tenderness over the base of the 5th metatarsal after an inversion injury — commonly mistaken for a simple sprain.
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Bilateral acute sprain
Two ankles injured simultaneously — consider a higher-energy mechanism, associated fractures and secondary injuries.
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Suspected non-accidental injury
In children, injuries that do not fit the mechanism or history — safeguarding review alongside orthopaedic assessment.
Living with it
A common injury, and a very rehabbable one.
Four things that make the biggest difference — proprioceptive rehab, graded load, bracing for sport and prompt reassessment if things give way.
A quiet reminder
Consistency beats intensity, every time.
Small, steady balance and strengthening sessions — kept up for weeks — do more than a heroic week that doesn’t last.
- 01 Rehab
Do the balance work, daily
Wobble-board, single-leg balance and peroneal strengthening — the dull work that prevents the next sprain.
- 02 Load
Progress load carefully
Rebuild activity gradually — pain-free walking, jogging, cutting and jumping in that order, not all at once.
- 03 Support
Brace for sport
A lace-up brace or tape for high-risk sport in the first season back — meaningfully cuts re-sprain rates.
- 04 Reviews
Reassess if it gives way
Recurrent giving way weeks after a sprain deserves proper reassessment — this is when instability becomes chronic.
Frequently asked
Everything we get asked about ankle sprains.
Quick answers on Ottawa rules, POLICE, physiotherapy, bracing and when surgery is considered.
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How do I know if it’s broken or just sprained?
The Ottawa Ankle Rules are the validated way to decide. If you have bony tenderness over the tip or back edge of either malleolus, over the navicular or the base of the 5th metatarsal, or you cannot take four steps immediately after the injury and in the emergency department, you need an X-ray. Otherwise, a fracture is very unlikely.
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Should I rest completely or keep moving?
Keep moving, safely. Modern guidance uses POLICE — Protect, Optimally Load, Ice, Compress, Elevate — because early controlled loading gives better outcomes than prolonged rest and immobilisation for a simple sprain.
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How long does an ankle sprain take to heal?
Most mild to moderate sprains settle within 2–6 weeks for daily life, but full return to cutting sport can take 8–12 weeks. High-grade sprains and syndesmotic injuries take longer. The single biggest predictor of a good outcome is proper rehab, not time alone.
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Do I need physiotherapy?
For anything more than a very mild sprain, yes. Proprioceptive rehab and peroneal strengthening are the interventions that reduce chronic instability and re-sprain rates. Rest and a brace alone are not enough.
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When is surgery considered?
Surgery — usually a modified Broström anatomic repair of the ATFL and CFL — is reserved for chronic ankle instability that has failed a proper structured rehab programme. It is not a first-line option for acute sprains.
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What is the red flag I should not ignore?
Inability to weight-bear immediately after the injury plus bony tenderness over the malleoli, navicular or 5th metatarsal base means you need an X-ray to exclude a fracture. Severe pain out of proportion after a crush injury needs urgent assessment for compartment syndrome.
Related content
Keep reading.
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Chronic ankle instability
Recurrent giving way after a sprain — what to do next.
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MSK ultrasound
Imaging the lateral ligament complex and peroneal tendons.
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Foot & ankle MRI
Assessing ligament tears and osteochondral lesions of the talus.
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X Ray
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Non-surgical realignment of a dislocated hip.
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