Comparison of Oral Versus Intravenous Antibiotics for the Treatment of Diabetic Foot Osteomyelitis: A Propensity-Matched, Retrospective Cohort Study

Background: Diabetic foot osteomyelitis (DFO) poses significant challenges due to its high morbidity and recurring nature. Current treatments involve prolonged antibiotics and often surgical intervention; however, the optimal route of antibiotic administration is unknown. This study evaluated the effect of route of antibiotic administration on treatment failure among patients with diabetic foot osteomyelitis. Methods: The authors conducted a retrospective cohort study among patients with unresected diabetic foot osteomyelitis. A propensity score was used to match the treatment exposure groups. The primary outcome was treatment failure, defined as either (1) treatment with additional antibiotic course or (2) additional surgical debridement/amputation at the original site of infection within 1 year of initial treatment. Secondary outcomes included the impacts of hemoglobin A1c, peripheral arterial disease, obesity, and infection severity on treatment failure. Results: Among 152 patients meeting criteria, 49 matched pairs were analyzed. Treatment failure rates did not significantly differ between oral and intravenous groups (OR 0.98, 95% CI 0.30–3.19, p > 0.9). A time-to-event analysis similarly found no significant outcome disparities between groups (p = 0.3). Conclusions: The study results support the previously published literature that demonstrates comparable treatment outcomes between routes of antibiotic administration when treating diabetic foot osteomyelitis.