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Orthopaedic Proceedings
Vol. 103-B, Issue SUPP_15 | Pages 52 - 52
1 Dec 2021
Slater J Hanberg P Bendtsen MAF J⊘rgensen AR Greibe E S⊘balle K Bue M J⊘rgensen N Stilling M
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Aim

Pyogenic spondylodiscitis remains a therapeutic challenge, as demonstrated by divergent treatment guidelines. The combination of moxifloxacin and rifampicin may be an attractive treatment option for cases caused by staphylococci; however, previous studies have reported a reduction in plasma concentrations of moxifloxacin when co-administered with rifampicin. The magnitude of this reduction in spinal tissues is not known. We aimed to investigate the interaction of rifampicin on moxifloxacin tissue concentrations in vertebral cancellous bone, intervertebral disc and subcutaneous adipose tissue in steady-state conditions using microdialysis in a porcine model.

Method

Twenty female pigs were randomized into two groups of ten pigs: Group A received moxifloxacin 400 mg orally once daily for three days preoperatively. Group B received moxifloxacin 400 mg orally for three days preoperatively combined with rifampicin 450 mg twice daily for seven days preoperatively. Measurements were obtained from plasma, vertebral cancellous bone, intervertebral disc and subcutaneous adipose tissue for 24 h. Microdialysis was applied for sampling in solid tissues.


Orthopaedic Proceedings
Vol. 103-B, Issue SUPP_5 | Pages 8 - 8
1 Mar 2021
Bendtsen MAF Bue M Hanberg P Slater J Thomassen M Hansen J S⊘balle K Öbrink-Hansen K Stilling M
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Aim

Flucloxacillin is conventionally administered intravenously for perioperative prophylaxis, while oral administration is typical for bacterial inoculation prophylaxis following smaller traumatic wounds. We aimed to assess the time, for which the free flucloxacillin concentration was maintained above the minimum inhibitory concentration (fT>MIC) for meticillin-susceptible Staphylococcus aureus in soft and bone tissue, after intravenous and oral administration, using microdialysis in a porcine model.

Method

16 pigs were randomly allocated to either intravenous (Group IV) or oral (Group PO) flucloxacillin 1 g every 6 h during 24 h. Microdialysis was used for sampling in cancellous and cortical bone, subcutaneous tissue, and the knee joint. In addition, plasma was sampled. The flucloxacillin fT>MIC was evaluated using a low MIC target (0.5 μg/mL) and a high MIC target (2.0 μg/mL).


Bone & Joint Research
Vol. 10, Issue 1 | Pages 60 - 67
1 Jan 2021
Bendtsen MAF Bue M Hanberg P Slater J Thomassen MB Hansen J Søballe K Öbrink-Hansen K Stilling M

Aims

Flucloxacillin is commonly administered intravenously for perioperative antimicrobial prophylaxis, while oral administration is typical for prophylaxis following smaller traumatic wounds. We assessed the time, for which the free flucloxacillin concentration was maintained above the minimum inhibitory concentration (fT > MIC) for methicillin-susceptible Staphylococcus aureus in soft and bone tissue, after intravenous and oral administration, using microdialysis in a porcine model.

Methods

A total of 16 pigs were randomly allocated to either intravenous (Group IV) or oral (Group PO) flucloxacillin 1 g every six hours during a 24-hour period. Microdialysis was used for sampling in cancellous and cortical bone, subcutaneous tissue, and the knee joint. In addition, plasma was sampled. The flucloxacillin fT > MIC was evaluated using a low MIC target (0.5 μg/ml) and a high MIC target (2.0 μg/ml).