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Diabetic Foot Ulcer & Charcot Neuro-Osteoarthropathy

Diabetes can damage two key protectors of foot health, nerves (loss of sensation) and blood vessels (impaired healing). The result is a dangerous duo:

  • Neuropathic / neuro-ischemic foot ulcer – an open sore that won’t close because pressure goes unfelt and blood flow is limited.
  • Charcot neuro-osteoarthropathy (“Charcot foot”) – a silent collapse of foot bones and joints that warps the arch and creates rock-hard pressure points that ulcerate.

Early, coordinated care prevents infection, amputation, and loss of independence. Our limb-salvage team pairs on-site vascular testing, advanced wound technology, and stage-matched Charcot reconstruction to protect and, when needed, rebuild your foundation.

Pathophysiology & Risk Factors

Ulcer Formation Charcot Breakdown Systemic Drivers
Loss of protective sensation → unrecognized repetitive pressure Autonomic neuropathy ➞ ↑ bone blood flow ➞ osteopenia Long‐standing diabetes (≥ 10 yrs)
Limited ankle dorsiflexion / rigid claw toes create focal plantar load Minor sprain or mid-foot twist sets off inflammatory bone resorption HbA1c > 8 %, chronic kidney disease
Micro- & macro-vascular disease delay healing Mid-foot & hind-foot joints sublux, arch caves, new pressure points form Smoking, hyperlipidemia, obesity

Once an ulcer opens over a Charcot-collapsed mid-foot, bacteria find easy entry to bone (osteomyelitis). Timely off-loading and realignment avert that spiral.

Hallmark Signs & Symptoms

Foot Ulcer

  • Callus that “punches through” to a crater ≥ 2 mm deep
  • Surrounding skin may be numb yet warm, pink, or dusky
  • Drainage in the sock, mild odor if infected
  • Often painless despite serious depth or bone exposure

Acute Charcot Foot (Eichenholtz Stage 0-I)

  • Sudden swelling, warmth, and redness without obvious wound
  • Bounding pulses; X-ray may be normal early
  • Temperature gap ≥ 2 °C compared with opposite foot

Chronic Charcot (Stage II-III)

  • “Rocker-bottom” or collapsed arch; bony bump under mid-foot
  • Recurrent ulcers over bony prominences
  • Difficulty fitting regular shoes or braces

Diagnostic Work-Up

Modality Purpose
10 g monofilament & 128 Hz tuning fork Confirm loss of protective sensation
Ankle-Brachial Index (ABI) / Toe pressures Assess macro-vascular flow (≥ 0.9 ABI or ≥ 60 mmHg toe for healing)
Weight-bearing X-rays Detect Charcot fragmentation, rocker-bottom, osteomyelitis (late)
MRI or PET-CT Differentiate acute Charcot vs osteomyelitis; map marrow edema
Probe-to-bone & deep culture Guide antibiotic when ulcer probes to bone
Lab panel HbA1c, CRP/ESR, nutrition (albumin, Vit D)

Evidence-Based Management

Component Ulcer Care & Infection Control Charcot Off-Loading & Reconstruction
Mechanical Off-Load Total-contact cast (TCC) or removable CAM walker until ulcer heals TCC → CROW walker in acute phase (8-12 wks)
Wound Bed Prep Weekly sharp debridement, moisture-balance dressings Same cast changes prevent new skin breakdown
Advanced Dressings Cellular/dermal matrices, negative-pressure wound therapy (NPWT) for deep / post-op wounds NPWT after reconstruction
Infection Control Culture-guided oral / IV antibiotics; bone biopsy if osteomyelitis suspected Early debridement + 6-week IV antibiotics for infected Charcot
Vascular Optimisation Endovascular or bypass re-vascularisation if toe pressure < 60 mmHg —
Definitive Surgery Excision of infected bone, minimally invasive 1-stage ORIF with antibiotic beads Realignment fusion (mid-foot, hind-foot, ankle) with beaming plates/ropes once inflammation cools
Footwear & Bracing Custom depth shoes, pressure-mapped insoles after healing Rocker-sole Charcot-rescue shoes or custom AFO

Multicentre data show > 85 % ulcer closure at 12 weeks when TCC+weekly debridement are paired with glucose & vascular optimization. Stage I Charcot cooled in cast averts surgery in ~60 % of cases; realignment fusion restores plantigrade foot in > 90 % of unstable Stage II–III.

Treatment Philosophy

  • Limb before lesion – we stabilise glucose, flow, and infection first; fancy dressings come second.
  • Cast early, cut late – non-removable TCC remains the gold standard; surgery reserved for unstable Charcot, infected bone, or non-healing ulcers.
  • Team sport – vascular, infectious-disease, endocrinology, and certified pedorthists coordinate in-house.
  • Prevent the second ulcer – pressure-mapping guides custom shoes; every healed patient gets quarterly skin & shoe checks.

Frequently Asked Questions

Ulcers: until fully epithelialised — often 6–8 weeks. Acute Charcot: casting continues until skin temperature gap < 1 °C for 2 consecutive visits (usually 3–4 months).

Yes—with a sealed cast-cover or removable CAM walker (if compliance is excellent). Non-removable casts heal ulcers faster because patients cannot cheat on weight-bearing.

Realignment fusion creates a stable, plantigrade platform and markedly lowers re-ulceration risk, but lifelong custom footwear and glucose control remain essential.

Save the Limb – and Your Lifestyle

A draining sore or suddenly swollen diabetic foot needs expert, same-week care. Schedule an urgent evaluation with North Texas Podiatry Associates for vascular-checked, team-based ulcer closure and Charcot stabilization that safeguard every step.

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