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NewsA randomized controlled trial found that local aqueous tobramycin injections didn't reduce fracture-related infections in patients with open extremity fractures compared to IV antibiotics alone. Both groups saw roughly a 6% infection rate — far from the 12% reduction researchers had hoped to demonstrate. The findings raise new questions about how best to deliver local antibiotics safely and effectively.
A prospective randomized controlled trial presented at the Orthopaedic Trauma Association Annual Meeting found that adding local aqueous tobramycin injections to standard IV antibiotic therapy did not reduce fracture-related infection rates in patients with open extremity fractures. The results challenge earlier retrospective studies that had suggested a benefit from local antibiotic delivery.
Researchers across three trauma centers enrolled 569 patients, randomly assigning them to receive either 40 mL of local aqueous tobramycin plus IV antibiotics or IV antibiotics alone. Both groups ended up with roughly the same infection rate, undermining the study's original hypothesis that local tobramycin would cut infections in half.
By the Numbers:
Why it matters: While local antibiotic delivery remains a promising concept, this trial shows that aqueous tobramycin at current doses isn't the answer. Researchers also flagged a potentially important secondary finding — that the timing of IV antibiotic administration may matter — which will be explored in follow-up analyses.
