Diabetic Foot Osteomyelitis Treatment

Diagnosis

The American College of Physicians recommends considering a combination of probe-to-bone test, plain X-rays, and inflammatory markers (ESR, CRP, or PCT) as initial diagnostic studies for diabetic foot osteomyelitis, with a strength of evidence rated as high 1, 2
The Infectious Diseases Society of America suggests performing MRI when the diagnosis remains in doubt despite clinical, X-ray, and laboratory findings, with a moderate level of evidence 1, 3
Bone samples (rather than soft tissue) should be obtained for culture, either intraoperatively or percutaneously, to determine causative microorganisms and guide antibiotic therapy, with a high strength of evidence 1
When bone biopsy is needed, it should be done under fluoroscopic or CT guidance, traversing uninvolved skin if possible, with a moderate level of evidence 4

The American Diabetes Association recommends considering surgical resection of infected bone combined with systemic antibiotics, particularly in cases with severe infections, exposed bone, peripheral arterial disease, or mid or hind-foot lesions, with a high strength of evidence 1, 2, 5
Early surgery (within 24-48 hours) is recommended for moderate and severe diabetic foot infections to remove infected and necrotic tissue, with a high level of evidence 2
Urgent consultation with both surgical and vascular specialists is necessary for patients with peripheral arterial disease and foot infection, with a moderate level of evidence 2

The International Working Group on the Diabetic Foot suggests considering antibiotic treatment without surgery in cases of forefoot osteomyelitis without need for immediate drainage, no peripheral arterial disease, or no exposed bone, with a moderate level of evidence 2, 6
Select antibiotics based on likely or proven pathogens and their susceptibilities, clinical severity of infection, and risk of adverse events, with a high strength of evidence 1, 7
Common effective antibiotic regimens include piperacillin-tazobactam, linezolid, ampicillin/sulbactam, or amoxicillin/clavulanate, with a moderate to high level of evidence 7

The Infectious Diseases Society of America recommends 4-6 weeks of antibiotic therapy for osteomyelitis without surgical resection, with a moderate level of evidence 3, 7
After surgical debridement or minor amputation with positive bone margin culture, 3 weeks of antibiotic therapy may be sufficient, with a low to moderate level of evidence 7
For extensive infections or in patients with severe peripheral arterial disease, consider extending treatment up to 3-4 weeks, with a moderate level of evidence 1

Do not empirically target Pseudomonas aeruginosa in temperate climates unless it has been isolated from cultures of the affected site within previous weeks, with a moderate level of evidence 1, 7
Cases where nonsurgical management might be considered include when radical cure would cause unacceptable loss of function, patient has ischemia due to unreconstructable vascular disease but wishes to avoid amputation, infection confined to forefoot with minimal soft-tissue loss, or surgery carries excessive risk, with a moderate level of evidence 6
Adjunctive treatments NOT recommended for diabetic foot infections include topical antiseptics or antibiotics, hyperbaric oxygen therapy, negative pressure wound therapy, or silver preparations or honey, with a moderate to high level of evidence 2

Assess response to therapy by monitoring resolution of local and systemic signs of inflammation, with a moderate level of evidence 7
If osteomyelitis treatment fails, consider accuracy of original diagnosis, presence of residual necrotic or infected bone, appropriateness of antibiotic coverage and duration, and need for vascular assessment, with a moderate level of evidence 6, 7
Use a minimum follow-up duration of 6 months after the end of antibiotic therapy to diagnose remission, with a moderate level of evidence 7