Efficacy of low-dose local clindamycin in different times for microbial decontamination of autogenous particulate bone graft

Background Clindamycin in low concentration (20 μg/mL) is safe for vitality and osteogenic potential of bone cells. The aim of this study was to evaluate the efficacy of local clindamycin (20 μg/mL) in two different exposure times, for microbial decontamination of particulate bone graft, collected during implant site preparation. This non-randomized parallel-group study was conducted on samples from 17 patients. The particulate bone collected during implant site preparation was divided into three portions by weight: in group S1, the particulate bone was immersed in thioglycolate broth without any antibiotic treatment; in group S2, the collected particulate bone was irrigated with 100 mL clindamycin solution (20 μg/mL); and in group S3, the collected particulate bone was soaked in one ml clindamycin solution (20 μg/mL) for 3 min. Samples in the three groups were cultured in aerobic and anaerobic media and species and CFU count of isolated bacteria were determined. Results Analysis of the data demonstrated a significant difference among the three groups in the mean count of total microorganisms ( P = 0.001). The difference in the mean count of anaerobic and aerobic microorganisms in the three groups was statistically significant as well ( P = 0.001). Pseudomonas aeruginosa was the only microorganism that was not affected with the mentioned antibiotic. Conclusions Local use of low-dose clindamycin (20 μg/mL)—irrigation or 3 min immersing—is effective for the decontamination of particulate bone grafts.