Diabetic foot — clinical management

Red Flags

Severe diabetes-related foot infection (systemic toxicity, deep ulcer to bone, gas in tissues, rapid spread) — admit; broad-spectrum IV antibiotics; surgical debridement^[1]
Critical limb ischaemia with diabetic foot ulcer (rest pain, ankle pressure <50 mmHg) — vascular emergency; revascularisation may save limb^[1]
Probe-to-bone positive ulcer or X-ray bone changes — likely osteomyelitis; bone biopsy and prolonged targeted antibiotics^[1]
Charcot neuroarthropathy — acute red, hot, swollen foot in diabetic neuropathy without infection; total contact cast off-loading; orthopaedic referral^[1]

First-line treatment

Interventions

Off-loading (gold standard: total contact cast)^[1]
Plantar diabetic foot ulcers heal only when off-loaded. Total contact cast or removable cast walker rendered irremovable; bed rest insufficient
Surgical debridement^[1]
Sharp debridement of necrotic tissue; major surgical debridement for severe infection or osteomyelitis; minor amputation to salvage limb when feasible
Glycaemic and risk-factor control^[1]
Optimise HbA1c; smoking cessation; statin and antiplatelet for ASCVD; structured diabetes self-management education
Multidisciplinary diabetic foot team^[1]
Endocrinology + podiatry + vascular surgery + infectious diseases + diabetic foot nurse — reduces amputation rates 50–70%

First-line drug therapy

Drug	Class	Adult	Paediatric	Notes
Cephalexin or amoxicillin-clavulanate (mild infection)^[1]	Beta-lactam (oral)	Cephalexin 500 mg PO QID OR amox-clav 875/125 mg PO BD × 7–10 days	Weight-based	Mild, superficial infection without bone involvement; cover Staph aureus and streptococci
Piperacillin-tazobactam or ertapenem (moderate-severe)^[1]	Broad-spectrum beta-lactam	Piperacillin-tazobactam 4.5 g IV q8h OR ertapenem 1 g IV daily; 10 days for moderate/severe soft-tissue (per 2023 update — shorter than older 14-day default)	—	Polymicrobial cover including Gram-negatives and anaerobes; add vancomycin or linezolid if MRSA risk (prior colonisation, severe infection, prevalent locally)
Targeted IV antibiotic for osteomyelitis^[1]	Bone-penetrating regimen	Per culture and sensitivity; typical: cefazolin or ceftriaxone for MSSA; vancomycin for MRSA; ciprofloxacin + clindamycin or rifampicin combination	—	6 weeks for osteomyelitis (parenteral with step-down to oral); follow-up to 6 months to define remission

Cephalexin or amoxicillin-clavulanate (mild infection)^[1]

Beta-lactam (oral)

Adult: Cephalexin 500 mg PO QID OR amox-clav 875/125 mg PO BD × 7–10 days
Paediatric: Weight-based

Mild, superficial infection without bone involvement; cover Staph aureus and streptococci

Piperacillin-tazobactam or ertapenem (moderate-severe)^[1]

Broad-spectrum beta-lactam

Adult: Piperacillin-tazobactam 4.5 g IV q8h OR ertapenem 1 g IV daily; 10 days for moderate/severe soft-tissue (per 2023 update — shorter than older 14-day default)
Paediatric: —

Polymicrobial cover including Gram-negatives and anaerobes; add vancomycin or linezolid if MRSA risk (prior colonisation, severe infection, prevalent locally)

Targeted IV antibiotic for osteomyelitis^[1]

Bone-penetrating regimen

Adult: Per culture and sensitivity; typical: cefazolin or ceftriaxone for MSSA; vancomycin for MRSA; ciprofloxacin + clindamycin or rifampicin combination
Paediatric: —

6 weeks for osteomyelitis (parenteral with step-down to oral); follow-up to 6 months to define remission

Safety-net

Inspect feet daily — look for redness, swelling, blisters, cuts, especially between toes; report new lesions same week^[1]
Never walk barefoot; check shoes for foreign bodies before wearing; trim toenails straight across^[1]
Sudden severe foot pain, fever, or rapidly spreading redness — same-day care; can be limb-threatening^[1]

Referral criteria

Severe diabetic foot infection or critical limb ischaemiaEmergency department; multidisciplinary diabetic foot team^[1]
Suspected osteomyelitis (probe-to-bone, X-ray bone changes, non-healing ulcer >6 weeks)Diabetic foot service for MRI, bone biopsy, and prolonged targeted therapy^[1]
Acute Charcot neuroarthropathyOrthopaedic / diabetic foot service for total contact casting^[1]
PAD on screening (ABI <0.9 or absent pulses)Vascular surgery for revascularisation evaluation^[1]

Clinical summary

Prevention, infection management, and offloading of diabetic foot disease per IWGDF/IDSA 2023; risk-stratified surveillance, multidisciplinary care.

References

1.IWGDF/IDSA 2023 Guidelines on the Diagnosis and Treatment of Diabetes-related Foot Infections; IWGDF Practical Guidelines 2023 (2023)