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Ankle fracture, classification, ORIF and getting back on your feet.

From a simple lateral malleolus fracture to a trimalleolar injury with syndesmotic disruption, modern UK practice combines careful classification, timely fixation and early rehabilitation.

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A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against NICE, BOA and BOAST standards you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including Weber and Lauge-Hansen classification, ORIF and TightRope syndesmotic fixation.

Key facts

Ankle fracture at a glance.

The essentials, in plain English: what breaks, how it is classified, and how modern UK teams decide on boot versus surgery.

  • What it is

    A break of one or more of the bones that form the ankle mortise: distal fibula (lateral malleolus), distal tibia (medial and posterior malleolus) and talus.

  • Weber classification

    Based on the fibular fracture level relative to the syndesmosis. A is below and usually stable, B is at the level and often unstable, C is above and disrupts the syndesmosis.

  • Lauge-Hansen

    Mechanism-based system. Supination-external rotation (SER) is by far the most common at around 70 per cent, followed by SA, PA and PER patterns.

  • Malleolar involvement

    Lateral only, bimalleolar (medial plus lateral) and trimalleolar (adds posterior malleolus) with a rising risk of instability and syndesmotic injury.

  • Ottawa Ankle Rules

    Decision tool used in the emergency department to select who needs an X-ray, sparing many patients unnecessary imaging.

  • Definitive treatment

    Stable non-displaced fractures do well in a boot or cast. Displaced or unstable patterns need ORIF with plate and screws, often within days.

Why this guide matters

Get the classification right, get the plan right.

Ankle fractures range from a stable Weber A fibula that heals in a boot to an unstable trimalleolar injury needing surgery. The three principles below shape everything else on this page.

  • Stability drives management

    Weber A patterns are usually stable, Weber B are often unstable and Weber C almost always are. Stability, not just the X-ray line, decides between a boot and ORIF.

  • Do not miss the syndesmosis

    A high fibula fracture, medial clear space widening or a positive squeeze test all point to syndesmotic injury. Modern practice usually fixes this with a TightRope suture-button.

  • Early movement, protected loading

    After stable fixation, gentle ankle range of movement starts almost immediately, with progressive weight-bearing from around two weeks in a CAM boot.

How the diagnosis is made

From the twist to a clear surgical plan.

The steps a UK emergency department and orthopaedic team will normally follow, so you know what to expect at each stage.

  1. 01

    Assessing

    History and mechanism

    Twisting injury, fall from height or direct blow. Note weight-bearing at the time, any deformity and any prior ankle problems.

  2. 02

    Assessing

    Focused examination

    Inspection for deformity, swelling and bruising. Palpate the whole fibula, the malleoli, the navicular and the fifth metatarsal base.

  3. 03

    Assessing

    Neurovascular check

    Distal pulses, capillary refill, sensation over the sural, deep peroneal and tibial nerve territories. Any pale or dusky foot is urgent.

  4. 04

    Confirming

    Apply the Ottawa Ankle Rules

    X-ray if there is bone tenderness at the posterior distal fibula or tip of the lateral malleolus, the posterior distal tibia or tip of the medial malleolus, the navicular or fifth metatarsal base, or the patient cannot weight-bear four steps in ED.

  5. 05

    Confirming

    X-ray series

    Standard AP, lateral and mortise views. Look at the medial clear space, talar shift, fibular length and the syndesmotic tibiofibular overlap.

  6. 06

    Planning

    CT for complex patterns

    Requested for comminuted, intra-articular or posterior malleolus fractures to plan fixation and quantify articular involvement.

  7. 07

    Planning

    MRI for occult and soft-tissue

    Considered when X-rays are normal but suspicion is high, or to assess tendon and syndesmotic ligament injury before surgery.

Typical timeline: ED assessment to a definitive fixation plan within days.

Symptoms

What an ankle fracture feels and looks like.

The typical picture of pain, swelling, deformity and inability to weight-bear, and the features that mean it is time to escalate urgently.

  • Sudden ankle pain

    Immediate, sharp pain after a twist or fall, often with an audible crack.

  • Swelling and bruising

    Rapid swelling around the malleoli, sometimes tracking into the foot within hours.

  • Deformity

    Visible angulation or a shortened, externally rotated foot suggests a displaced or dislocated pattern.

  • Inability to weight-bear

    Cannot manage four steps at the time of injury or in ED. A key Ottawa criterion for imaging.

  • Bone tenderness

    Point tenderness over the posterior distal fibula, medial malleolus, navicular or fifth metatarsal base.

  • Syndesmotic pain

    Pain on external rotation stress or on squeezing the tibia and fibula together higher up the leg (positive squeeze test).

  • Skin tenting or open wound

    Skin stretched over the fracture, or any break in the skin, changes the fracture from closed to open and needs urgent orthopaedic review.

  • Red flag - neurovascular loss

    Pale, cold or numb foot, or absent pulses. A dislocated ankle needs urgent reduction to restore perfusion.

Treatment

How ankle fractures are treated in the UK.

Stable patterns are treated in a boot with early weight-bearing. Displaced or unstable patterns need ORIF, with modern syndesmotic fixation and structured rehabilitation.

  • CAM boot or below-knee cast

    Non-displaced stable fractures are managed in a walking boot or cast with weight-bearing as tolerated and follow-up X-rays.

  • ORIF with plate and screws

    Open reduction and internal fixation for displaced or unstable fractures. Aim for definitive surgery within days when soft tissues allow.

  • TightRope suture-button

    Modern flexible fixation for syndesmotic injury. Often preferred over rigid screws because it does not usually need routine removal.

  • Syndesmotic screws

    Traditional rigid fixation across the tibiofibular joint. Effective and well understood, sometimes removed at three to four months.

  • Posterior malleolus fixation

    Reduce and fix when the fragment is greater than 25 per cent of the articular surface or displaced more than 2 mm to protect the ankle joint.

  • Early weight-bearing rehabilitation

    After stable fixation, protected weight-bearing in a CAM boot from around two weeks with progressive loading.

  • Structured physiotherapy

    Early ankle range of movement, then progressive strengthening, balance work and return-to-sport drills.

  • VTE prophylaxis

    Low molecular weight heparin per NICE selective risk assessment. Ankle fractures carry a real venous thromboembolism risk, higher in less mobile or higher-risk patients.

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 ED clinician, orthopaedic surgeon or physiotherapist knows your injury and history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Fractures (non-complex): assessment and management (NG38).

  • British Orthopaedic Association Standards for Trauma (BOAST). Open fractures and ankle fractures.

  • Stiell IG et al. Ottawa Ankle Rules. Annals of Emergency Medicine.

  • NICE. Venous thromboembolism in over 16s: reducing the risk of hospital-acquired VTE (NG89).

Red flags

When an ankle fracture needs urgent attention.

Most ankle fractures are managed in a planned trauma pathway. These are the situations that need action within minutes or hours, not days.

  • Open fracture

    Any break in the skin over the fracture is an open injury needing urgent antibiotics, tetanus cover and orthopaedic review per BOAST standards.

  • Ankle dislocation

    Deformed, poorly perfused ankle. Needs immediate reduction in ED to protect the skin, nerves and blood supply.

  • Neurovascular compromise

    Pale, cold, pulseless or insensate foot. A time-critical emergency, not something to observe.

  • Compartment syndrome of the leg or foot

    Disproportionate pain, tense compartments, pain on passive stretch. Rare in isolated ankle fractures but must not be missed.

  • Skin tenting or blistering

    Fracture blisters and threatened skin change surgical timing. Fixation may be delayed until soft tissues settle.

  • Suspected DVT or PE

    Calf pain and swelling out of proportion, or breathlessness and chest pain after immobilisation. Assess urgently.

  • Diabetic or neuropathic ankle

    Higher risk of wound problems, Charcot changes and poor union. Needs a lower threshold for specialist input.

  • Suspected pathological fracture

    Low-energy fracture in an older or unwell patient. Consider osteoporosis and, rarely, underlying malignancy.

  • Persistent pain after healing

    Ongoing pain beyond expected recovery may reflect malunion, post-traumatic arthritis, chronic instability or CRPS.

Recovery

A staged return, from boot to sport.

Four things that make the biggest difference during recovery: wearing the boot as prescribed, moving early and safely, loading progressively and giving the ankle the time it needs.

A quiet reminder

Consistency beats intensity, every time.

Small, steady physiotherapy sessions, kept up over months, do more than a heroic week that flares the ankle and puts you back in a boot.

  1. 01 Boot

    Wear the boot as prescribed

    The CAM boot protects healing bone and soft tissue. Take it off only when your team says so, including at night early on.

  2. 02 Move early

    Get the ankle moving safely

    Early gentle range of movement, guided by your physiotherapist, prevents stiffness once the fracture is protected.

  3. 03 Load

    Progress weight-bearing steadily

    From protected walking in the boot to full weight-bearing in shoes over weeks, not days. Do not push through sharp pain.

  4. 04 Timelines

    Give it the full recovery

    Return to sport is typically three to six months for stable fractures and six to nine months for complex or trimalleolar patterns.

Frequently asked

Everything we get asked about ankle fractures.

Quick answers on classification, imaging, surgery, syndesmotic fixation and getting back to activity.

  • What is an ankle fracture?

    A break of one or more bones that make up the ankle joint: the distal fibula (lateral malleolus), the distal tibia (medial and posterior malleolus) and, less commonly, the talus. Severity ranges from a stable isolated fibula fracture to an unstable trimalleolar injury with syndesmotic disruption.

  • Do I definitely need an X-ray?

    Not always. The Ottawa Ankle Rules are used in the emergency department to decide. An X-ray is needed if there is bone tenderness at specific landmarks (posterior distal fibula, tip of lateral malleolus, posterior distal tibia, tip of medial malleolus, navicular or fifth metatarsal base) or if you cannot weight-bear four steps at the time of injury and in ED.

  • What are Weber and Lauge-Hansen classifications?

    Weber describes the level of the fibular fracture relative to the syndesmosis: A is below (usually stable), B is at the level (often unstable) and C is above with syndesmotic disruption (unstable). Lauge-Hansen describes the injury mechanism, most commonly supination-external rotation, which accounts for about 70 per cent of ankle fractures.

  • Will I need surgery?

    Stable, non-displaced fractures are usually treated in a CAM boot or cast with weight-bearing as tolerated. Displaced or unstable fractures, bimalleolar and trimalleolar patterns and significant syndesmotic injury usually need ORIF with plate and screws, ideally within days once the soft tissues allow.

  • What is a TightRope and why is it used?

    A TightRope is a flexible suture-button device used to fix the syndesmosis (the ligament complex between tibia and fibula). Compared with traditional rigid screws it allows a small amount of physiological movement, tends to reduce return-to-theatre for hardware removal and has good published outcomes.

  • How long is recovery and when can I return to sport?

    Most stable fractures are protected in a boot for around six weeks with early ankle range of movement and progressive weight-bearing. Return to running and light sport is typically at three to six months for stable fractures and six to nine months for complex or trimalleolar patterns. Complications such as malunion, non-union, post-traumatic arthritis, chronic instability and complex regional pain syndrome (CRPS) are uncommon but important to watch for.

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