Active Charcot foot is easily mistaken for cellulitis, gout or a sprain, because it is warm, red and swollen and — owing to neuropathy — often painless or only mildly painful. A skin temperature difference of more than 2°C between the two feet at the same site is a practical clue. X-rays are often normal early; MRI shows marrow oedema before fractures appear. Offload immediately while the diagnosis is being confirmed, because walking on an active Charcot foot is what produces the rocker-bottom deformity.
- Think Charcot in any unilateral warm, swollen foot in a patient with neuropathy, especially without a wound.
- Compare skin temperature with the other foot; a difference above 2°C supports active disease.
- A normal X-ray does not exclude it — request MRI if suspicion persists.
- Offload in a cast or boot at once; do not wait for imaging.
Why it matters
Early offloading is the one intervention that prevents deformity, and the diagnosis is most often missed at exactly that stage.
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