Health condition · Clinically reviewed
Charcot foot, the most missed limb-threatening emergency in diabetes.
Charcot neuroarthropathy is a rapid, destructive joint disease in the insensate foot — most commonly of diabetes. It mimics cellulitis and is frequently missed. Immediate immobilisation in a total contact cast can prevent limb-threatening deformity.
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 NICE, IWGDF or peer-reviewed sources you can see at the end.
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Current for 2026
Reflects current UK and international guidance on diabetic foot and Charcot neuroarthropathy.
Key facts
Charcot foot at a glance.
The essentials, in plain English — what Charcot foot is, why it looks so much like cellulitis, and what the evidence says actually saves the limb.
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Definition
Charcot foot is a progressive neuropathic destruction of the bones and joints of the foot in a person with peripheral neuropathy.
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Most common cause
Most commonly a complication of diabetes with peripheral neuropathy — but any dense sensory neuropathy can trigger it.
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Classic presentation
A warm, swollen, red foot that mimics cellulitis and is frequently missed — often after minor unremembered trauma.
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Eichenholtz staging
Progresses through Eichenholtz stages 0–3 — from acute inflammation to fragmentation, coalescence and remodelling.
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Gold-standard care
A total contact cast, applied early and kept on until warmth resolves, is the single most limb-saving treatment.
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Later reconstruction
Fixed deformity, ulceration or instability may require reconstructive foot and ankle surgery in a specialist unit.
Why this guide matters
Immobilise first, investigate second.
Charcot foot is missed because it looks like cellulitis — this guide sets out the pattern clearly so nobody weight-bears on a Charcot foot for weeks unrecognised.
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The warm diabetic foot is Charcot until proven otherwise
A warm, swollen, red foot in a person with diabetes and neuropathy deserves immobilisation and same-week MDT review — not weeks of oral antibiotics.
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The total contact cast is the treatment
A well-moulded cast, applied early and kept on until the foot cools, is what protects the joints from destruction.
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Reconstruction is not the goal
Most Charcot cases never need surgery — casting and orthoses do the work. Reconstruction is reserved for deformity or ulceration.
How the diagnosis is made
From warm diabetic foot to a Charcot pathway.
The steps a UK GP or diabetic foot team will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
Clinical suspicion, ruling out cellulitis and first-line X-ray
Phase 2 · Confirming
MRI, bone scan or SPECT-CT when uncertain
Phase 3 · Managing
MDT referral and Charcot pathway
- 01
Recognising
Clinical suspicion in the diabetic foot
A warm foot in a person with diabetes and neuropathy is Charcot until proven otherwise — the diagnosis is largely one of pattern recognition.
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Recognising
Rule out cellulitis
A skin-thermometer difference of more than 2 °C between feet, elevation-relieved swelling and no clear breach in the skin all point toward Charcot rather than infection.
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Recognising
Weight-bearing X-ray of the foot
Standard first-line imaging — looks for subtle subluxation, fracture, joint disorganisation or the classic midfoot collapse.
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Confirming
MRI foot for early Charcot changes
The most sensitive test for early Charcot — picks up bone-marrow oedema before X-ray changes appear.
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Confirming
Bone scan or SPECT-CT
Used when the diagnosis is uncertain — helpful for separating Charcot from osteomyelitis in difficult cases.
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Managing
Diabetic foot MDT referral
Any suspected Charcot needs same-week referral to a specialist diabetic foot multidisciplinary team.
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Managing
Charcot pathway activation
Immediate immobilisation, offloading and coordinated follow-up — the local Charcot pathway should be triggered without delay.
Typical timeline: days, not weeks from first suspicion to immobilisation and MDT review.
Symptoms
What Charcot foot actually looks like.
The pattern is more telling than any single sign — a warm, swollen, red foot in a person with diabetes and neuropathy, often without much pain.
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Warm foot
A foot that is noticeably warmer than the other — often the earliest sign, and easy to overlook.
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Red foot
Redness that can look strikingly like cellulitis, but usually eases when the foot is elevated.
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Swollen foot
Diffuse swelling of the midfoot and ankle in a person with neuropathy — a classic Charcot pattern.
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Midfoot collapse (rocker-bottom)
A dropped, convex midfoot with loss of the medial arch — the late deformity Charcot is famous for.
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Temperature difference > 2 °C
A skin-thermometer difference of more than 2 °C between feet is a well-established Charcot signal.
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Difficulty walking
A sense of instability, giving way or clumsy foot placement — often out of proportion to pain.
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Limping
Altered gait and limping despite little or no pain — the neuropathy hides the severity of the underlying injury.
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Red flag
Any warm, swollen, red foot in a person with diabetes — assume Charcot until proven otherwise and immobilise.
Treatment
How Charcot foot is treated in the UK.
A staged approach — immediate total contact casting, then a Charcot restraint orthosis, with reconstructive surgery reserved for fixed deformity or ulceration.
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Immediate total contact cast
A well-moulded total contact cast, non-weight-bearing, applied as soon as Charcot is suspected — the single most limb-saving intervention.
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Serial casting until warmth resolves
The cast is changed every 1–2 weeks and continued until the foot temperature difference and swelling settle — typically several months.
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Custom Charcot restraint orthosis (CROW boot)
Once the acute phase has settled, a custom CROW boot allows protected weight-bearing and helps prevent recurrence.
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Address concurrent osteomyelitis
If bone infection is present — often through a plantar ulcer — targeted antibiotics and surgical debridement are needed alongside offloading.
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Bisphosphonates (specialist selective use)
Used selectively in specialist hands — evidence is mixed and they are not a substitute for immobilisation.
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Exostectomy for bony prominences
Surgical removal of prominent bony bumps under the midfoot to prevent ulceration in a stable but deformed foot.
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Midfoot or hindfoot arthrodesis
Reconstructive fusion surgery for fixed deformity, instability or recurrent ulceration — a specialist foot and ankle procedure.
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Below-knee amputation (last resort)
Reserved for an unreconstructable foot with uncontrolled infection or unsalvageable deformity — a decision made only after specialist MDT review.
What this guide is based on
The sources behind every claim on this page.
UK national guidance and international diabetic foot 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, diabetic foot team or foot and ankle surgeon knows your history and can tell you which parts apply to you. If in doubt, get seen.
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NICE NG19. Diabetic foot problems — prevention and management.
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International Working Group on the Diabetic Foot (IWGDF). Guidelines on the Charcot foot.
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British Society for Diabetic Foot Care. Clinical standards for the Charcot foot.
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American Diabetes Association / ACFAS. Charcot foot in diabetes — consensus report.
Red flags
When a Charcot foot becomes limb-threatening.
Charcot foot is already an emergency. These are the situations where the risk to the limb rises further and specialist review cannot wait.
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Delayed diagnosis (over 4 weeks)
Every week without immobilisation risks further joint destruction — delayed diagnosis is the single biggest driver of deformity and amputation.
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Concurrent osteomyelitis
Bone infection alongside Charcot — usually via a plantar ulcer — needs urgent MDT review, antibiotics and often surgery.
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Rocker-bottom midfoot collapse
A dropped, convex midfoot is a late deformity that puts skin at high risk — needs urgent orthotic and surgical planning.
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Skin breakdown over bony prominence
Any ulcer over a Charcot prominence is a limb-threatening event — same-day diabetic foot team review.
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Failed cast immobilisation
Persistent warmth or progressive deformity despite good casting — needs reassessment of technique, adherence and diagnosis.
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Post-operative non-union
After Charcot reconstruction, failure of fusion needs early recognition — imaging and surgical review.
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Recurrent Charcot in the other foot
The contralateral foot is at real risk — any new warmth or swelling deserves immediate assessment.
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Below-knee amputation risk
Uncontrolled infection or an unsalvageable foot may need amputation — a decision made only in a specialist MDT.
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Post-reconstruction infection
New pain, swelling, warmth or wound problems after Charcot surgery — contact your surgical team the same day.
Living with it
A serious condition, but a survivable one.
Four things that make the biggest difference day to day — offloading, skin surveillance, protecting the other foot and staying in the pathway.
A quiet reminder
Adherence to the cast is what saves the limb.
Total contact casting only works if it stays on — every day without the cast is a day the joints can destroy themselves further.
- 01 Offloading
Wear the cast, every day
The total contact cast only works if it stays on — adherence is the single biggest predictor of a good outcome.
- 02 Skin
Check your feet daily
Look at both feet every day for redness, swelling or breakdown — with neuropathy, your eyes replace your pain sense.
- 03 Load
Protect the other foot
The contralateral foot is now bearing more load and is at real risk of Charcot too — treat it as precious.
- 04 Reviews
Stay in the diabetic foot pathway
Long-term follow-up with the diabetic foot team, tight glycaemic control and prompt review of any new warmth or swelling.
Frequently asked
Everything we get asked about Charcot foot.
Quick answers on casting, the diabetic foot pathway, reconstructive surgery and when to seek help.
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What actually causes Charcot foot?
Charcot foot is caused by progressive damage to the bones and joints of an insensate foot — the sensory neuropathy hides normal protective pain, so minor unremembered trauma triggers an inflammatory cycle that destroys the joints. In the UK it is most commonly a complication of diabetes with peripheral neuropathy.
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Why is Charcot foot so often missed?
Because the classic presentation — a warm, red, swollen foot — looks almost identical to cellulitis. In a person with diabetes and neuropathy, that combination should be treated as Charcot until proven otherwise, and the foot immobilised while the diagnosis is confirmed.
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How long do I need to wear a total contact cast?
The cast is worn until the foot temperature difference and swelling have fully settled — typically several months, sometimes longer. It is changed every 1–2 weeks, and rushing out of the cast is one of the main causes of deformity and relapse.
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What is a rocker-bottom foot?
A rocker-bottom foot is the late Charcot deformity where the midfoot collapses downward, giving the sole a convex, rocker-like shape. It puts the skin over the bony prominence at very high risk of ulceration and is a strong indication for reconstructive surgery.
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Will I need surgery?
Most people with early Charcot are treated successfully with casting and orthoses alone. Surgery — exostectomy or midfoot/hindfoot arthrodesis — is reserved for fixed deformity, recurrent ulceration or instability, and is planned in a specialist foot and ankle unit.
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What is the red flag I should not ignore?
Any warm, swollen, red foot in a person with diabetes — assume Charcot until proven otherwise, come off the foot, and get same-week diabetic foot team review. Delayed diagnosis is the single biggest driver of deformity and amputation.
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