Local concentrations of gentamicin obtained by microdialysis after a controlled application of a GentaColl sponge in a porcine model

• Published in: Journal of orthopaedic research 2020-08, Vol.38 (8), p.1793-1799
• Main Authors: Thomassen, Maja B., Hanberg, Pelle, Stilling, Maiken, Petersen, Klaus K., Søballe, Kjeld, Krag, Lasse B., Højskov, Carsten S., Bue, Mats
• Format: Article
• Language: English
• Subjects: Animals; Anti-Bacterial Agents - administration & dosage; Anti-Bacterial Agents - pharmacokinetics; Bone and Bones - metabolism; Female; gentamicin; Gentamicins - administration & dosage; Gentamicins - pharmacokinetics; infection; Microdialysis; Orthopedic Procedures - adverse effects; pharmacokinetics; Surgical Sponges; Surgical Wound Infection - etiology; Surgical Wound Infection - prevention & control; Swine; tissue penetration
• ISSN: 0736-0266; 1554-527X
• DOI: 10.1002/jor.24588

Local treatment with gentamicin may be an important tool in the prevention and treatment of surgical site infections in high‐risk procedures and patients. The aim of this study was to evaluate the pharmacokinetic profile of gentamicin in bone and surrounding tissue, released from a controlled application of a GentaColl sponge in a porcine model. In eight female pigs, a GentaColl sponge of 10 × 10 cm (1.3 mg gentamicin/cm2) was placed in a cancellous bone cavity in the proximal tibia. Microdialysis was used for sampling of gentamicin concentrations over 48 hours from the cavity with the implanted GentaColl sponge, cancellous bone parallel to the cavity over and under the epiphyseal plate, cortical bone, the intramedullary canal, subcutaneous tissue, and the joint cavity of the knee. Venous blood samples were obtained as reference. The main finding was a mean peak drug concentration (95% CI) of gentamicin in the cancellous bone cavity containing the implanted GentaColl sponge of 11 315 (9049‐13 581) μg/mL, persisting above 1000 μg/mL until approximately 40 hours after application. Moreover, the concentrations were low (