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Health condition · Clinically reviewed

Broken ankle, Weber patterns, Ottawa rules and when surgery is needed.

Not every twisted ankle is a fracture, and not every fracture needs surgery. A structured plan from X-ray to rehabilitation gives you the best chance of a full recovery.

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

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

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

  • 03

    Current for 2026

    Reflects modern UK trauma pathways including Weber and Lauge-Hansen classification, syndesmotic repair and staged pilon care.

Key facts

The broken ankle at a glance.

The essentials, in plain English. What counts as an ankle fracture, how the patterns are classified and how UK trauma teams decide between a boot and surgery.

  • What it is

    A break in one or more of the bones forming the ankle joint, most commonly the distal fibula, distal tibia (medial and posterior malleoli) or talus.

  • Weber classification

    Weber A sits below the syndesmosis and is usually stable, Weber B is at the level of the syndesmosis, Weber C is above it and often unstable.

  • Lauge-Hansen

    A mechanism-based system describing foot position and force direction, useful for predicting the injury pattern before imaging.

  • Ottawa ankle rules

    A validated tool that decides whether an X-ray is needed based on bony tenderness and ability to weight-bear.

  • Stable v unstable

    Stable isolated Weber A or B fractures often heal in a boot or cast, while bimalleolar, trimalleolar and Weber C injuries usually need surgery.

  • Pilon fractures

    High-energy tibial plafond injuries with soft-tissue damage are staged: external fixator first, then delayed internal fixation once swelling settles.

Why this guide matters

A structured plan, from mortise to mobility.

Ankle fractures are common, but decisions turn on small details: the level of the fibula fracture, the state of the medial side and the soft tissues around the joint.

  • Stability decides treatment

    Isolated Weber A and stable Weber B fractures often heal in a boot. Bimalleolar, trimalleolar and Weber C injuries usually need ORIF to restore the ankle mortise.

  • Soft tissues drive timing

    In pilon and severely swollen ankles, surgery is staged. An external fixator spans the joint first, and definitive fixation waits until fracture blisters and swelling settle.

  • Rehabilitation makes the outcome

    A perfect X-ray is not the same as a functional ankle. Physiotherapy, proprioception and a staged return to sport are what determine long-term function.

How the diagnosis is made

From injury to a clear plan.

The steps a UK emergency department or foot and ankle team will normally follow, in order, so you know what to expect and why.

  1. 01

    Assessing

    Ottawa ankle rules

    X-ray is indicated when there is bony tenderness at the posterior edge or tip of the lateral or medial malleolus, the navicular or base of the fifth metatarsal, or inability to weight-bear four steps.

  2. 02

    Assessing

    Neurovascular and skin check

    Pulses, capillary refill, sensation and skin integrity are recorded early. Fracture blisters, tenting or an open wound push the injury up the priority queue.

  3. 03

    Assessing

    Standard X-ray series

    AP, lateral and mortise views of the ankle. Full-length tibia and fibula films are added when a Maisonneuve injury is suspected from medial tenderness.

  4. 04

    Confirming

    CT for complex patterns

    Pilon, talar and calcaneal fractures, and comminuted or intra-articular injuries, are mapped with CT to plan fixation and articular reduction.

  5. 05

    Confirming

    MRI when needed

    Selective use for occult fractures, syndesmotic disruption, osteochondral lesions of the talus and significant soft-tissue injury not explained by the X-ray.

  6. 06

    Planning

    Open fracture grading

    Open injuries are classified using the Gustilo-Anderson system, triggering antibiotics, tetanus cover and urgent orthoplastic input.

  7. 07

    Planning

    Orthopaedic decision

    Stable v unstable, articular step, syndesmotic integrity and soft-tissue state decide between conservative care in a boot or cast and surgical fixation.

Typical timeline: imaging and a definitive plan within hours, surgery within days.

Symptoms

What a broken ankle actually looks like.

The classic mix of pain, swelling and inability to weight-bear, and the features that tell UK trauma teams this is a fracture and not a sprain.

  • Pain and swelling

    Immediate ankle pain with rapid swelling around the malleoli after a twist, fall or direct blow.

  • Bruising and deformity

    Bruising tracks under the foot within hours. Visible deformity or a shortened, rotated foot suggests fracture-dislocation.

  • Inability to weight-bear

    Failure to take four steps immediately after injury and in the department is one of the Ottawa criteria for imaging.

  • Bony tenderness

    Point tenderness over the posterior edge or tip of the lateral or medial malleolus, the navicular or base of the fifth metatarsal.

  • Reduced range of motion

    Guarding, muscle spasm and pain limit dorsiflexion, plantarflexion and inversion or eversion.

  • Proximal fibula tenderness

    Pain high on the outer calf with medial ankle tenderness raises the possibility of a Maisonneuve injury and syndesmotic disruption.

  • Fracture blisters

    Tense clear or blood-filled blisters over the skin, especially in pilon injuries, are a sign of severe soft-tissue swelling.

  • Red flag - open or neurovascular

    An open wound over the fracture, absent pulses, a cold or dusky foot or altered sensation needs urgent orthopaedic review.

Common patterns

The fracture patterns UK trauma teams recognise.

  • Lateral malleolus alone

    Weber A or B fractures of the distal fibula. Often stable and treatable in a boot or cast.

  • Bimalleolar fracture

    Both medial and lateral malleoli are broken. Unstable and usually needs ORIF.

  • Trimalleolar fracture

    Medial, lateral and posterior malleoli. Unstable, with the posterior fragment often needing fixation.

  • Maisonneuve injury

    Proximal fibula fracture with syndesmotic disruption and often a medial injury. Easy to miss.

  • Pilon fracture

    High-energy comminuted fracture of the tibial plafond with severe soft-tissue injury.

  • Talar and calcaneal

    Serious hindfoot fractures with a high risk of avascular necrosis and wound complications.

Treatment

How broken ankles are treated in the UK.

A boot or cast for stable patterns, urgent reduction for dislocations, ORIF for unstable and articular injuries, and a staged approach for pilon fractures. Rehabilitation is the through-line.

  • Immediate reduction and splint

    Dislocated ankles are reduced under sedation as soon as possible to protect skin and neurovascular structures, then splinted in a well-padded backslab.

  • Open fracture pathway

    IV antibiotics, tetanus cover, wound photography, saline-soaked dressing and urgent washout with debridement, aiming for definitive fixation within 24 hours.

  • Conservative boot or cast

    Stable, undisplaced Weber A and selected Weber B fractures heal in a below-knee cast or walker boot for around six weeks with staged weight-bearing.

  • ORIF for unstable ankles

    Displaced Weber B and C, bimalleolar and trimalleolar patterns are stabilised with plates and screws, with a syndesmotic screw or suture-button when needed.

  • Staged pilon care

    High-energy tibial plafond fractures are spanned with an external fixator first, then converted to internal fixation at two to three weeks once swelling settles.

  • Talar and calcaneal fixation

    ORIF is planned in a specialist foot and ankle unit, with awareness of avascular necrosis after talar neck fractures and high wound complications after calcaneal ORIF.

  • Rehabilitation and physiotherapy

    Progressive weight-bearing, range of motion, strengthening and proprioception work, with a return to sport typically at three to six months.

  • Bone health and fragility review

    Older adults with a low-energy fracture are considered for a fracture liaison service, DEXA scan and bone-protection treatment.

Multidisciplinary care

Foot and ankle orthopaedics, physiotherapy and rehabilitation, together.

Complex patterns such as pilon, talar and calcaneal fractures are best managed in specialist foot and ankle units, working to AO and BOAST standards. Older patients with fragility fractures are referred to a fracture liaison service for bone-health assessment.

For more on the fixation techniques, see our guide to ankle fracture fixation.

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 emergency department, GP or orthopaedic surgeon knows the injury pattern and your history and can tell you which parts apply to you. If in doubt, get seen.

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

  • NICE. Fractures (non-complex): assessment and management (NG38) and Fractures (complex): assessment and management (NG37).

  • AO Foundation. Weber classification and principles of internal fixation of the ankle.

  • Ottawa Ankle Rules (Stiell et al). Clinical decision rule for radiography in acute ankle injury.

Red flags

When a broken ankle needs urgent attention.

Most ankle fractures are treated in a routine trauma clinic. These are the situations that need urgent hospital care.

  • Open fracture

    Any wound communicating with the fracture is a surgical emergency needing antibiotics, tetanus cover and urgent orthoplastic review.

  • Neurovascular compromise

    A cold, pale or dusky foot, absent pulses or altered sensation after an ankle injury needs immediate reduction and orthopaedic input.

  • Fracture-dislocation

    A visibly deformed ankle with tented skin needs urgent reduction under sedation to protect skin and vessels, even before full imaging.

  • Fracture blisters

    Tense clear or blood-filled blisters mean surgery is usually delayed until the soft tissues recover, to reduce wound breakdown and infection.

  • Missed Maisonneuve injury

    Medial ankle tenderness with a proximal fibula fracture and syndesmotic disruption is easy to miss without full-length tibia and fibula films.

  • Compartment syndrome

    Disproportionate pain, pain on passive stretch and a tense calf after high-energy trauma needs urgent assessment for leg or foot compartment syndrome.

  • Suspected DVT

    New calf pain, swelling or breathlessness in a plaster or after surgery needs assessment for deep vein thrombosis and pulmonary embolism.

  • Fragility fracture in older adults

    A low-energy ankle fracture in an older adult should trigger a fracture liaison service review and bone-health assessment.

  • Non-healing or worsening pain

    Progressive pain, deformity or inability to weight-bear beyond the expected timeline suggests nonunion, malunion or hardware failure.

Recovery

A structured recovery, from cast to sport.

Four things that make the biggest difference: respecting the healing timeline, physiotherapy, preventing blood clots and returning to sport gradually.

A quiet reminder

A healed bone is not the end of the recovery.

Strength, balance and confidence take longer than the bone itself. Physiotherapy turns a united fracture into a functional ankle.

  1. 01 Protect

    Respect the healing timeline

    Bone takes weeks to knit. Follow the weight-bearing and boot plan your surgeon gives you, even if the ankle feels better than expected.

  2. 02 Move

    Physiotherapy is not optional

    Structured range of motion, strengthening and proprioception work is what turns a healed bone into a functional ankle.

  3. 03 Guard

    Prevent blood clots

    Reduced mobility raises the risk of DVT. Follow the VTE prevention plan, keep the leg moving where allowed and know the warning signs.

  4. 04 Rebuild

    Return to sport gradually

    Most patients get back to normal walking by three months and sport by three to six months, guided by strength, balance and surgeon review.

Frequently asked

Everything we get asked about a broken ankle.

Quick answers on the Ottawa rules, Weber patterns, surgery and recovery timelines.

  • How do I know if my ankle is broken and not just sprained?

    The Ottawa ankle rules are used by UK clinicians to decide. An X-ray is indicated when there is bony tenderness at the tip or posterior edge of the lateral or medial malleolus, the navicular or the base of the fifth metatarsal, or if you cannot weight-bear four steps immediately and in the department. Rapid swelling, deformity or an inability to take any weight all point towards a fracture rather than a sprain.

  • What is the Weber classification?

    Weber is a simple X-ray-based system based on the level of the fibula fracture. Weber A sits below the syndesmosis and is usually stable. Weber B is at the level of the syndesmosis and can be stable or unstable depending on the medial side. Weber C is above the syndesmosis and is often unstable, frequently needing surgery.

  • When does an ankle fracture need surgery?

    Unstable patterns generally need surgery. That includes displaced Weber B and C fractures, bimalleolar and trimalleolar injuries, fracture-dislocations, syndesmotic disruption and pilon fractures. ORIF with plates and screws restores the ankle mortise, and a syndesmotic screw or suture-button is added where the tibiofibular joint is injured.

  • What is a Maisonneuve injury and why is it often missed?

    A Maisonneuve injury combines a proximal fibula fracture near the knee with disruption of the syndesmosis and often a medial malleolus or deltoid ligament injury. It is easy to miss because the fibula fracture is far from the painful ankle. Medial ankle tenderness with a normal-looking ankle X-ray should prompt full-length tibia and fibula films.

  • How long will I be non-weight-bearing?

    It depends on the pattern and the surgery. Stable conservatively managed fractures are often non-weight-bearing or protected in a boot for two to six weeks, then progressed. After ORIF, patients are typically non-weight-bearing for around six weeks, then move to partial and full weight-bearing in a boot with physiotherapy. Your surgeon will give you the exact plan.

  • What are the long-term complications?

    Most people recover well. Possible complications include stiffness, post-traumatic osteoarthritis, malunion, nonunion, wound problems, infection, deep vein thrombosis, complex regional pain syndrome and, after talar neck fractures, avascular necrosis. Following the rehabilitation plan and attending review appointments reduces these risks.

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