Diabetic Foot Ulcers: China's Most Preventable Amputation Cause
Diabetic foot ulcers (DFU) affect approximately 15% of all diabetic patients during their lifetime and are the leading cause of non-traumatic lower limb amputation in China. With over 140 million diabetic patients in China — the world's largest diabetic population — DFU represents a massive and growing clinical challenge.
The good news: with early detection and proper multidisciplinary treatment, up to 85% of amputations are preventable. Shanghai's top hospitals offer world-class diabetic foot care combining endocrinology, vascular surgery, wound care, and rehabilitation under one roof.
Ruijin Hospital Shanghai — home to China's leading endocrinology and metabolic disease department — operates a dedicated Diabetic Foot Clinic with a full multidisciplinary team. The Vascular Surgery team led by Dr. Fu Weiguo at Zhongshan Hospital provides advanced endovascular and surgical revascularization for ischemic diabetic feet.
Why Diabetic Feet Are Different: The Underlying Mechanisms
Diabetic foot ulcers develop from a combination of three pathological processes that interact and amplify each other:
| Mechanism | What Happens | Clinical Result |
|---|---|---|
| Peripheral Neuropathy | High blood glucose damages sensory, motor, and autonomic nerves | Loss of protective sensation; patient cannot feel injury; abnormal foot pressure distribution; dry, cracked skin |
| Peripheral Arterial Disease (PAD) | Atherosclerosis narrows arteries supplying the foot | Reduced blood flow; impaired wound healing; tissue ischemia and necrosis |
| Impaired Immunity | Hyperglycemia impairs neutrophil and macrophage function | Increased infection susceptibility; rapid spread of infection; biofilm formation resistant to antibiotics |
Wagner Classification: Grading Diabetic Foot Ulcers
The Wagner Classification is the most widely used system for grading DFU severity and guiding treatment decisions:
| Grade | Description | Treatment Approach | Amputation Risk |
|---|---|---|---|
| Grade 0 | Intact skin; pre-ulcerative lesion (callus, deformity, bony prominence) | Offloading, footwear modification, preventive care | Very low |
| Grade 1 | Superficial ulcer; skin surface only; no infection | Wound debridement, moist dressing, offloading, glucose control | Low |
| Grade 2 | Deep ulcer penetrating to tendon, capsule, or bone; no abscess | Surgical debridement, advanced wound dressings, antibiotics, vascular assessment | Moderate |
| Grade 3 | Deep ulcer with abscess, osteomyelitis, or joint infection | Surgical drainage, bone debridement, IV antibiotics, possible partial amputation | High |
| Grade 4 | Gangrene of forefoot or heel | Revascularization if possible + partial amputation; aggressive infection control | Very High |
| Grade 5 | Extensive gangrene of entire foot | Major amputation; life-saving priority | Major amputation likely |
Wound Care Options: From Conservative to Surgical
Option 1 — Moist Wound Healing (湿性愈合)
As detailed in our Burns & Wound Care guide, moist wound healing is the gold standard for DFU management. A moist wound environment accelerates cell migration, maintains growth factor activity, and reduces pain during dressing changes.
- Hydrocolloid dressings: For shallow, low-exudate ulcers (Grade 1)
- Foam dressings: High absorbency for moderate-to-heavily exudating wounds
- Alginate dressings: For heavily exudating or infected wounds
- Silver / antimicrobial dressings: For infected or biofilm-colonized wounds
- Cadexomer iodine: Effective against biofilm; releases iodine slowly into wound bed
Option 2 — Negative Pressure Wound Therapy (NPWT / 负压创面治疗)
A sealed foam dressing connected to a vacuum pump applies continuous or intermittent negative pressure to the wound.
- Mechanism: Removes excess exudate, reduces edema, stimulates granulation tissue formation, increases local blood flow
- Best for: Grade 2–3 ulcers; post-surgical wounds; wounds with significant depth or undermining
- Evidence: Reduces wound volume by 50–60% faster than standard dressings in DFU
Option 3 — Debridement (清创)
Removal of necrotic, infected, or non-viable tissue to expose healthy wound bed. Multiple methods available:
| Debridement Type | Method | Best For |
|---|---|---|
| Sharp / surgical | Scalpel, scissors, curette | Thick necrotic tissue; urgent infection control |
| Enzymatic | Collagenase ointment | Selective removal; patients unable to tolerate surgery |
| Autolytic | Moist dressings promote self-digestion | Mild necrosis; maintenance debridement |
| Maggot therapy (MDT) | Sterile Lucilia sericata larvae | Infected wounds with biofilm; highly selective — only removes necrotic tissue |
| Ultrasonic | Low-frequency ultrasound | Biofilm disruption; wound bed preparation |
Option 4 — Advanced Biological Therapies
- Platelet-Rich Plasma (PRP): Concentrated growth factors from patient's own blood injected into wound margins; stimulates healing
- Skin substitutes / bioengineered skin: Dermal matrices (e.g., Integra) or living skin equivalents applied to prepare wound bed for grafting
- Skin grafting: Split-thickness skin graft once wound bed is clean and granulating
- Growth factor therapy: Topical becaplermin (PDGF) for chronic non-healing ulcers
Option 5 — Hyperbaric Oxygen Therapy (HBO)
For ischemic DFU where revascularization is not possible, HBO increases dissolved oxygen in plasma, improving tissue oxygenation and promoting healing in hypoxic wound environments. Typically 20–40 sessions for chronic DFU.
Vascular Assessment & Revascularization
In any DFU with suspected ischemia (absent pulses, ABI <0.9, rest pain, non-healing despite good wound care), vascular assessment is mandatory before wound healing can occur.
| Assessment Tool | What It Measures | Threshold for Concern |
|---|---|---|
| Ankle-Brachial Index (ABI) | Ratio of ankle to arm blood pressure | <0.9 = PAD; <0.4 = critical ischemia |
| Toe pressure / TBI | Digital artery pressure (more accurate in calcified vessels) | <30 mmHg = critical ischemia |
| Duplex ultrasound | Arterial anatomy and flow velocity | Stenosis >50% = significant |
| CT angiography | Full arterial roadmap for intervention planning | Pre-procedure planning |
Revascularization Options
- Endovascular (minimally invasive): Balloon angioplasty ± stenting of stenosed arteries; preferred first approach; performed by Dr. Fu Weiguo's Vascular Surgery team at Zhongshan Hospital
- Bypass surgery: Surgical bypass graft for long-segment occlusions not amenable to endovascular treatment
- Hybrid procedures: Combination of endovascular and open surgery in the same session
Infection Management: The Race Against Amputation
Diabetic foot infections spread rapidly and can progress from cellulitis to osteomyelitis to sepsis within days. The IDSA classification guides antibiotic and surgical decisions:
| Severity | Signs | Treatment |
|---|---|---|
| Mild | Local infection only; <2 cm cellulitis; no systemic signs | Oral antibiotics (amoxicillin-clavulanate or cefalexin); outpatient |
| Moderate | >2 cm cellulitis; deep tissue involvement; no systemic signs | IV antibiotics; surgical debridement; hospitalization |
| Severe | Systemic signs (fever, leukocytosis, hypotension); limb-threatening | Broad-spectrum IV antibiotics; urgent surgical debridement; ICU if septic |
| Osteomyelitis | Bone involvement (probe-to-bone positive; MRI confirmation) | 6-week IV antibiotics ± bone resection; orthopedic consultation |
Offloading: The Most Underused Treatment
Offloading — removing pressure from the ulcer site — is the single most important non-surgical intervention for plantar DFU. Without offloading, no wound care will succeed.
| Offloading Device | Effectiveness | Compliance | Best For |
|---|---|---|---|
| Total Contact Cast (TCC) | Gold standard — highest evidence | Forced (non-removable) | Plantar neuropathic ulcers |
| Removable Cast Walker (RCW) | Equivalent to TCC if worn consistently | Patient-dependent | Patients needing wound access |
| Therapeutic footwear | Moderate | Good | Grade 0–1; prevention |
| Felted foam padding | Moderate | Good | Adjunct to footwear |
| Bed rest / wheelchair | Effective but impractical long-term | Poor | Acute severe cases only |
Multidisciplinary Care at Ruijin Hospital: The Full Team
- Endocrinology: Glucose optimization (HbA1c target <7%); insulin adjustment; metabolic management
- Vascular Surgery: ABI assessment; revascularization planning and execution
- Wound Care Specialists: Advanced dressing selection; NPWT; debridement
- Orthopedics: Charcot foot management; bone resection for osteomyelitis; corrective surgery
- Infectious Disease: Culture-guided antibiotic therapy; biofilm management
- Rehabilitation: Gait retraining; prosthetic fitting if amputation required; fall prevention
- Podiatry / Foot Care: Nail care; callus management; footwear prescription
What to Expect: Your Care Journey
- Initial Assessment: Full foot examination, ABI measurement, wound photography and grading, blood glucose and HbA1c, inflammatory markers
- Vascular Workup: Duplex ultrasound ± CT angiography if ischemia suspected
- Wound Care Initiation: Debridement, appropriate dressing selection, offloading device fitted
- Glucose Optimization: Endocrinology team adjusts diabetes medications; target HbA1c <7%
- Revascularization (if needed): Endovascular or surgical procedure to restore blood flow
- Advanced Therapies: NPWT, PRP, skin substitutes, or HBO added based on wound response at 4-week review
- Surgical Closure: Skin grafting or flap reconstruction once wound bed is clean and well-vascularized
- Prevention Program: Patient education, therapeutic footwear, regular foot checks every 3 months
Book a Consultation via CMCS Shanghai
CMCS coordinates multidisciplinary diabetic foot care for international patients at Ruijin Hospital and Zhongshan Hospital, including endocrinology, vascular surgery, wound care, and rehabilitation — all managed through a single point of contact.
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