Management of Diabetic Foot
Introduction
Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels.
It is a major global health problem affecting millions worldwide. Chronic hyperglycemia in
diabetes can lead to serious complications affecting small and large blood vessels. One such
frequent and serious complication is diabetic foot which remains a major cause of non-
traumatic lower limb amputations. Timely detection and appropriate multidisciplinary
treatment can help prevent amputations and associated morbidity in diabetic foot. This article
discusses the etiology, risk classification, multidisciplinary team approach, investigation and
management of diabetic foot at various stages to optimize outcomes.
Etiopathogenesis of Diabetic Foot
High blood glucose levels seen in diabetes leads to micro and macrovascular complications
over time. Microvascular complications affect small vessels like capillaries, arterioles and
venules leading to neuropathy and ulceration. Macrovascular complications involve larger
arteries supplying limbs predisposing to critical limb ischemia and gangrene. The main
pathophysiological mechanisms leading to diabetic foot include:
- Peripheral neuropathy: Damaged nerve fibers dull pain sensation and reduce awareness of
injury/ulceration risk. Altered biomechanics and unnoticed trauma are common causes of
ulcers.
- Foot deformities: Hammer/claw toes, bunion abnormalities compound trauma risk from
neuropathy.repetitive pressure stresses tissues.
- Ischemia: Atherosclerosis of leg arteries reduces blood flow predisposing to critical limb
ischemia and wounds heal slowly.
- Infection: Neuropathy masks pain/infection signs but immobility worsens infection rapidly
in diabetics.
- Impaired wound healing: Hyperglycemia affects collagen deposition, angiogenesis
impairing ulcer/wound healing.
Diabetic Foot Risk Classification
Early identification and classification of diabetes patients based on foot risk help guide
preventive strategies and timing of specialist referral:
- Risk Category 0 - No loss of protective sensation or structural abnormalities
- Risk Category 1 - Loss of protective sensation without structural abnormalities
- Risk Category 2 - Loss of protective sensation with deformities or previous ulcers
- Risk Category 3 - Minor wound(non-infected)/ulcer (<2cm diameter)
- Risk Category 4 - Major wound(infected)/ulcer(>2cm) or limb threatening
- Risk Category 5 - History of amputation for disease
Higher risk categories require prompt multidisciplinary management to prevent deterioration
and amputation.
Multidisciplinary Team Approach
Treating diabetic foot requires coordinated, team-based care involving physicians, surgeons,
wound specialists, podiatrists, nurses, dietitians and technical staff. Key roles include:
- Physician: Overall diabetes management, cardiovascular/renal care.
- Surgeon: Debridement of non-healing wounds, revascularization, amputation if required.
- Podiatrist: Regular foot screening/care, nail/callous care, footwear advice.
- Wound specialist: Dressings, grafts, hyperbaric oxygen therapy(HBOT).
- Nurse: Wound/dressing care training, patient education, follow ups.
- Dietitian: Meal plans to achieve glycemic control.
- Technical staff: Biomedical, prosthetics when needed.
Regular team meetings ensure coordinated care, seamless handovers and protocolized
treatment approaches customized to each patient's needs.
Investigations in Diabetic Foot
Thorough evaluation reveals etiology to guide appropriate management:
- Blood glucose monitoring and HbA1c level
- Lipid profile and renal function tests
- High resolution ultrasound doppler of pedal vessels
- Magnetic resonance angiography (MRA) or computed tomography angiography (CTA) if
ischemia suspected
- X-rays to identify fractures, osteomyelitis
- Magnetic resonance imaging (MRI) for deep tissue infections
- Tissue biopsy for suspected osteomyelitis
- Punch skin biopsy for nerve conduction studies if neuropathy suspected
- Wound swabs/tissue for microbiological examination
Early identification of ischemic, neuropathic or infected etiologies helps prevent amputations
through prompt revascularization, offloading or antibiotic treatment.
Diabetic Foot Management
Management is tailored based on Wagner/University of Texas wound classification and
follows a stepwise protocol:
Stage 0 (Risk category 1-3)
- Regular podiatry/wound care
- Custom footwear/offloading devices
- Patient education on self-care
- Glycemic control optimization
Stage 1 (Ulcer without infection/ischemia)
- Debridement and dressings
- Pressure relief/offloading
- Antibiotics only if secondary infection present
- Wound healing aids like HBOT if needed
Stage 2 (Ulcer with infection)
- Thorough debridement and dressings
- Broad spectrum antibiotics as per swab culture/sensitivity
- Treatment any underlying osteomyelitis
- Offloading and pressure relief
- Consider revascularization for ischemia
Stage 3 (Deep ulcer with bone/joint involvement)
- Joint/bone debridement if osteomyelitis
- Appropriate wound dressings and antibiotics
- Revascularization if ischemia present
- Adjuvant therapies like HBOT, wound healing agents
Stage 4 (Localized gangrene)
- Antibiotic treatment for infection
- Consider revascularization/amputation of infected part
Stage 5 (Extensive gangrene/limb threat)
- Immediate revascularization/amputation
- Organized wound debridement
- Antibiotics continued post-op
- Limb prosthesis/rehabilitation as needed
Close monitoring and diligent multi-pronged approach is vital to heal wounds/salvage limbs
and prevent morbidity/mortality associated with diabetic foot complications.
Role of Adjuvant Therapies
Certain adjuvant therapies when used appropriately in addition to standard measures can
assist wound healing in select difficult cases:
Hyperbaric Oxygen Therapy (HBOT)
Delivery of 100% oxygen at higher than atmospheric pressures enhances healing by
increasing tissue oxygen levels. Effective in accelerating deep wound healing, reducing
amputation rates when used with revascularization. Contraindicated in untreated
pneumothorax.
Growth factors
Topical platelet derived growth factor (PDGF) gels or recombinant human epidermal growth
factor (rhEGF) aids chronic wound healing by promoting angiogenesis and epithelialization
when applied to clean wounds.
Skin/muscle grafting
Split/full thickness skin grafts help heal deep ulcers after thorough debridement. Muscle flaps
in selected Stage 3/4 ulcers helps revitalize tissue. Requires specialized surgical skills.
Becaplermin gel
Topical 0.01% recombinant platelet-derived growth factor-BB preparation shown to promote
healing in neuropathic diabetic foot ulcers when used with standard care.
Vacuum assisted closure therapy
Use of negative pressure wound vacuum via sealed dressing over wound encourages
granulation and perfusion to expedite healing in large/dehisced post-surgical wounds.
Adjuncts are resource intensive and reserved for wounds resistant to standard measures under
specialist guidance based on risks,expected advantages.
Preventive Strategies
While managing established disease aggressively, consistent preventive strategies can
significantly reduce new cases and disease burden:
- Strict glycemic control through lifestyle and medications
- Regular foot screening and risk stratification
- Patient education on self-inspection, footwear/hygiene
- Podiatry care including nail, callous debridement
- Custom footwear/orthotics fitting for high risk patients
- Smoking cessation advice
- Multidisciplinary foot clinics for higher risk groups
- Public awareness programs address myths,screening importance
- National registries for surveillance, targeted interventions
While cure for diabetes remains elusive, concerted preventive measures can sharply reduce
avoidable limb loss and mortality from diabetic foot complications at population level.
Role of Rehabilitation
Timely rehabilitation facilitates functional recovery and improves quality of life after
treatment:
- Post amputation rehabilitation teaches limb prosthesis use, gait training.
- Occupational therapy for activities of daily living after complex wounds
- Physical therapy/exercises for wound/muscle healing promotion
- Custom footwear/adaptive devices after deformity corrections
- Psychological support through adjustment phases reduces distress
- Vocational counselling facilitates return to prior activities
- Peer support enhances coping, promotes long term self-care
Rehabilitation is often underrecognized yet critical to restored dignity and functionality after
debilitating episodes of diabetic foot. Early specialist involvement yields optimal outcomes.
Conclusion
Diabetic foot presents a destructive yet preventable complication if addressed proactively
through diligent risk stratification, multidisciplinary teamwork and management protocols.
Consistent preventive strategies including glycemic control and foot care minimize new cases
at community level. Combination of thorough investigations, judicious debridement,
revascularization, adjuvant therapies and antibiotics based on infection status helps heal
wounds and tissue loss. Rehabilitation thereafter ensures functional recovery and social
reintegration. With continued research into novel therapies and sustained focus on current
best practices, the overwhelming burden of diabetes foot complications worldwide can be
significantly curtailed.
