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Orthopaedic Proceedings
Vol. 101-B, Issue SUPP_14 | Pages 77 - 77
1 Dec 2019
EXTENSIVE DEBRIDEMENT IS FUNDAMENTAL FOR THE SUCCESS OF AN ABSORBABLE GENTAMICIN-LOADED BIO-COMPOSITE
Jensen LK Blirup SA Aalbæk B Bjarnsholt T Kragh KN Gottlieb H Bue M Jensen HE
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Aim

To study the antimicrobial effect of a gentamicin loaded bio-composite bone void filler in relation to a limited or extensive debridement of osteomyelitis lesions, respectively.

Methods

Nine pigs were inoculated into the right proximal tibial bone with a high virulent gentamicin sensitive strain of Staphylococcus aureus (104 CFU). Seven days after inoculation, Group A pigs (n=3) were exposed to a limited debridement of the bone lesion, whereas Group B pigs (n=3) were exposed to an extensive debridement. The bone defects of Groups A and B were filled with (2–5 ml) of an absorbable gentamicin (175 mg/10 mL) loaded bio-composite. The animals of Group A and B were euthanized 12 days after revision surgery. Group C animals did not undergo revision surgery and were euthanized seven (n=1) or nineteen (n=2) days post inoculation in order to follow the development of the untreated infection. None of the animals were treated with systemic antimicrobials. All bones were exposed to a post mortem CT scan and rigours pathological examinations. The surrounding bone tissue and the bio-composite were sampled for microbiology.

Orthopaedic Proceedings
Vol. 100-B, Issue SUPP_17 | Pages 64 - 64
1 Dec 2018
EXTREME HIGH LOCAL INTRAOPERATIVE GENTAMICIN CONCENTRATIONS ARE NEEDED TO PREVENT BIOFILM FORMATION IN VIVO
Jensen LK Bjarnsholt T Henriksen NL Kragh KN Jensen HE
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Aim

To investigate the local intra-operative concentration of gentamicin needed to prevent biofilm formation in a porcine model of implant-associated osteomyelitis.

Method

In total 24 pigs were allocated to six groups. Group A (n=6) was inoculated with saline. Groups B (n=6), C (n=3), D (n=3), E (n=3) and F (n=4) were inoculated with 10 μL saline containing 104 CFU of Staphylococcus aureus, however, different minimal inhibitory concentrations (MIC) of gentamicin were added to the inoculum of Groups C(160xMIC), D(1600xMIC), E(16000xMIC) and F(160000xMIC). The inoculums were injected into a pre-drilled implant cavity proximally in the right tibial bone. Following inoculation, a steel implant (2 × 15 mm) was placed in the cavity. The pigs were euthanized after five days. The implants were sonicated and swabs were taken from the implant cavity for microbiological evaluation. The peri-implant tissue was analyzed by histopathology including estimation of neutrophil infiltration.

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