Charcot Foot: Early Recognition, Offloading, and Prevention of Diabetic Foot Ulcers

Panelists:

Lee C. Rogers

Lawrence A. Lavery

Moderator:

Lisa Gould

Why Charcot Foot Demands Early Recognition

A warm, swollen, red foot in a person with peripheral neuropathy is easy to misread. It may look like cellulitis, gout, a sprain, deep venous thrombosis, or osteomyelitis, and it may not be very painful. Yet this presentation can mark the active phase of Charcot neuro-osteoarthropathy, when continued walking can turn inflammation and small fractures into permanent collapse of the foot.

That is the central clinical problem with Charcot foot: the patient may feel well enough to keep walking while the bones and joints are being progressively damaged. However once the arch collapses and a rocker-bottom deformity develops, pressure shifts to areas that were not built to bear weight. Callus, ulceration, infection, and amputation risk follow.

In this Wound Healing Society webinar, moderated by Lisa Gould, panelists Lee C. Rogers and Lawrence A. Lavery reviewed how neuropathy, mechanical stress, inflammation, offloading, wound care, and reconstructive surgery intersect in Charcot foot. The practical message is simple: recognize the active process early, protect the foot immediately, and plan for long-term pressure management even after the inflammation settles.

What Is Charcot Foot?

Charcot foot, also called Charcot neuroarthropathy or Charcot neuro-osteoarthropathy, is a destructive process affecting the bones, joints, and soft tissues of a foot with neuropathy. Diabetes is the most common underlying condition, although Charcot changes can occur with other causes of peripheral neuropathy.

Two traditional explanations help describe the process:

The neurotraumatic theory focuses on loss of protective sensation. Since the patient cannot reliably feel pain or pressure, a single injury or repeated minor trauma goes unnoticed, so continued loading produces fractures, ligament injury, and progressive joint instability.

The neurovascular theory focuses on autonomic dysfunction, increased local blood flow, inflammation, and osteoclastic bone resorption. Bone becomes more vulnerable at the same time that an insensate foot continues to bear weight.

In practice, these mechanisms overlap. Neuropathy removes the warning system, inflammation weakens the supporting structures, and repetitive loading drives the deformity forward.

The “Charcot Attack”: Recognizing the Active Phase

The webinar describes the active inflammatory presentation as a “Charcot attack.” The classic findings are:

One foot that is warmer than the other
Swelling and erythema
Little pain relative to the degree of inflammation or structural injury
Peripheral neuropathy or loss of protective sensation
A history of minor trauma, such as a trip or slip, although no clear injury may be remembered
Intact skin, particularly early in the process

Pain does not rule Charcot foot in or out. Some patients report discomfort, but neuropathy can make a serious injury feel surprisingly mild. That mismatch between the appearance of the foot and the level of pain is one reason diagnosis is often delayed.

Any person with peripheral neuropathy who develops an unexplained unilateral warm, swollen, red foot or ankle should be evaluated promptly for active Charcot neuro-osteoarthropathy. Protective immobilization and offloading should begin while alternative or concomitant diagnoses are evaluated. The International Working Group on the Diabetic Foot recommends considering the diagnosis even when plain radiographs are initially normal.

Charcot Foot or Something Else?

Charcot foot is a diagnosis that requires both recognition and exclusion of competing causes. The differential diagnosis commonly includes:

Cellulitis
Osteomyelitis
Gout or another inflammatory arthritis
Deep venous thrombosis
Traumatic fracture or sprain

An open ulcer changes the diagnostic picture because infection and Charcot neuroarthropathy can coexist. A clinician should not assume that all redness and swelling are caused by Charcot, nor should Charcot automatically be dismissed because infection is present.

History and examination should include the duration and progression of swelling, recent trauma, ulcer history, prior Charcot disease, neuropathy, vascular status, systemic signs of infection, skin integrity, deformity, and comparison with the opposite foot. Temperature differences between corresponding sites on the two feet can support assessment and monitoring, but temperature should be interpreted as one part of the clinical picture rather than as a stand-alone test.

Imaging and Diagnostic Workup

Weight-bearing radiographs of the foot and ankle are generally the starting point when the patient can safely stand. Bilateral views can help identify subtle alignment changes by comparison. Findings may include fractures, fragmentation, joint subluxation or dislocation, and loss of normal architecture.

Early in the active phase, however, radiographs may be normal. If clinical suspicion remains high, MRI can identify bone marrow edema, stress injury, and soft-tissue changes before major collapse appears on an X-ray. MRI can also contribute to evaluation when osteomyelitis is a concern, although distinguishing infection from active Charcot changes may still be difficult.

Laboratory tests are more useful for evaluating infection and other inflammatory conditions than for confirming Charcot foot itself. No single blood test establishes the diagnosis. When the presentation remains uncertain, coordinated review by foot and ankle, infectious disease, radiology, vascular, and wound care specialists may be needed.

The First Treatment Decision: Protect the Foot

When active Charcot neuro-osteoarthropathy is suspected, immobilization and offloading should begin while the diagnostic workup continues. Waiting for obvious radiographic collapse defeats the purpose of early recognition.

The goal is to reduce mechanical stress across inflamed bones and joints so the foot can move toward remission without additional deformity. A non-removable knee-high device is generally preferred when it is safe and feasible because it controls motion and reduces the opportunity for unprotected weight-bearing. Total contact casting is one established approach. A knee-high walker rendered non-removable may be another option depending on the patient, local expertise, skin condition, edema, and need for wound access.

A removable device may be necessary when frequent skin inspection or wound treatment is required, but its effectiveness depends heavily on patient adherence. A device cannot offload the foot when it is sitting by the bed.

The phrase “prolonged inflammatory phase, prolonged protection” captures the reality of treatment. Charcot foot usually requires months, not days, of protection. The transition out of immobilization should be guided by serial clinical assessment, including improvement in edema and warmth, objective temperature trends, and foot stability, rather than simply by the passage of a predetermined number of weeks.

Monitoring the Active Phase

Follow-up should assess:

Skin integrity and device-related pressure injury
Edema and erythema
Temperature difference compared with the contralateral foot
Changes in foot shape or alignment
Imaging findings when indicated
The patient’s ability to use the prescribed device consistently
The status of any ulcer, infection, or vascular disease

Edema can change rapidly, so casts and devices require careful surveillance and adjustment. Patients with neuropathy may not feel a developing pressure injury beneath an offloading device. Regular inspection is therefore part of the treatment, not an optional extra.

How Charcot Deformity Produces Ulcers

As the midfoot collapses, the longitudinal arch can flatten and the plantar surface may become convex, producing the characteristic rocker-bottom shape. Bony prominences that were once protected become new weight-bearing points. At the same time, tightness of the Achilles tendon and limited joint mobility can increase plantar pressure.

The result is a predictable sequence:

Structural collapse changes the footprint
Pressure concentrates over a bony prominence
Callus forms
Repetitive loading damages the tissue beneath the callus
An ulcer opens
Deep infection or osteomyelitis may develop if the pressure and wound are not controlled

Closing an ulcer without correcting the pressure pattern leaves the patient at high risk for recurrence. The long-term plan must address the foot that caused the wound, not only the wound itself.

When an Ulcer Is Already Present

A Charcot-related ulcer requires the same foundations as other diabetes-related foot ulcers, with additional attention to deformity and instability:

Effective offloading
Assessment of perfusion
Debridement of nonviable tissue and callus when appropriate
Management of soft-tissue infection or osteomyelitis
Moisture-balanced wound care
Glucose and nutritional optimization
Frequent reassessment of the device, skin, and wound

The WHS case-based Charcot resource follows a patient with type 2 diabetes, Charcot deformity, a Wagner grade 3 ulcer, and osteomyelitis. The care plan combined evaluation of blood flow, treatment of infection, serial debridement, exudate management, advanced wound therapy, and total contact casting once drainage was controlled. The wound closed after approximately three months, followed by additional casting and referral for reconstructive evaluation.

The case is useful because no single product or procedure did the work alone. Infection control, wound-bed preparation, pressure relief, vascular assessment, and a plan for the underlying deformity had to move together.

After Remission: Preventing the Next Ulcer

The end of active inflammation is not the end of Charcot care. The foot may remain deformed, neuropathic, and vulnerable to recurrence. Long-term management may include:

Custom therapeutic footwear and pressure-relieving insoles
A Charcot restraint orthotic walker or other custom bracing
Gradual, supervised return to weight-bearing
Daily inspection of the entire foot, including the plantar surface
Regular podiatric surveillance
Prompt evaluation of new warmth, swelling, redness, callus, blistering, or skin breakdown

The opposite foot also requires protection. The panel notes that Charcot changes may eventually involve the contralateral foot, and prolonged offloading can increase the load placed on that limb. Footwear, mobility aids, and rehabilitation planning should account for both sides.

When Is Surgery Considered?

Many patients can be managed nonoperatively if the foot remains stable, plantigrade, and able to fit safely into protective footwear or a brace. Surgery is generally considered when nonoperative management cannot provide a functional, ulcer-free foot.

Potential indications include:

A severe deformity that cannot be accommodated in a shoe or brace
A recurrent or nonhealing ulcer caused by a bony prominence
Instability that prevents safe ambulation
Recurrent infection associated with deformity
Failure of appropriate nonoperative management

Procedures may include removal of a focal bony prominence, Achilles tendon lengthening, or reconstructive realignment and fusion. When circumstances allow, reconstruction is often deferred until active inflammation and edema have improved. However, early stabilization or fusion-based strategies may be appropriate in selected patients with neuropathic ankle fractures, severe ankle instability, or instability that threatens limb salvage. Thus, operative planning is highly individualized and depends on vascular status, infection, bone quality, soft-tissue coverage, medical risk, and the patient’s functional goals.

A Multidisciplinary Condition

Charcot foot sits at the intersection of endocrinology, podiatry, orthopedic or foot-and-ankle surgery, vascular care, infectious disease, wound care, orthotics, rehabilitation, nursing, and patient self-management. Fragmented care creates predictable gaps: infection may be treated without correcting pressure, a wound will not close without protective footwear, or offloading may be prescribed without a mobility plan the patient can follow.

The best plan is one the patient can actually carry out. That means discussing work, transportation, home layout, fall risk, caregiver support, and the practical burden of prolonged immobilization.

Key Takeaways

A unilateral warm, swollen, red foot or ankle in a person with peripheral neuropathy should trigger urgent consideration of active Charcot neuro-osteoarthropathy.
Minimal pain is not reassuring when protective sensation is impaired.
Normal early radiographs do not exclude active Charcot disease.
Immobilization and offloading should begin when the diagnosis is suspected rather than waiting for visible collapse.
Charcot-related ulcers will recur if pressure and deformity are not addressed along with the wound.
Protection must continue through the active inflammatory phase and transition into lifelong footwear, surveillance, and prevention.
Surgery is reserved for selected patients with nonbraceable deformity, structurally driven recurrent ulceration, or instability–including hindfoot or ankle instability that threatens limb salvage–that cannot be managed safely with nonoperative care.

Watch the Full Webinar

Watch February 2024 Webinar: Charcot Foot Deformity on the WHS YouTube channel.