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[Antibiotic-loaded orthopedic cements. Pharmacokinetics and bone level]
F Langlais1, L Bunetel, A Segui
1Laboratoire de Bactériologie, CHU Hôpital Sud, Rennes.
Summary
Low viscosity antibiotic-loaded bone cements show mechanical properties similar to standard cements. This antibiotic delivery method ensures high local concentrations, reducing systemic risks and offering prolonged effectiveness for prosthesis infections and prophylaxis.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Infectious Diseases
Background:
- Antibiotic-loaded bone cements are used in orthopedic surgery.
- Ensuring adequate local antibiotic concentrations while minimizing systemic toxicity is crucial.
Purpose of the Study:
- To evaluate the mechanical properties and antibiotic release of low viscosity antibiotic-loaded bone cements.
- To assess the efficacy and safety of Gentamycin-loaded cement in patients and animal models.
Main Methods:
- Laboratory mechanical testing of 10 cement types.
- Clinical study of Gentamycin release in 26 total hip replacement patients.
- Intra-osseous concentration study in 32 sheep femora.
Main Results:
- Low viscosity antibiotic-loaded cements exhibited comparable mechanical characteristics to standard cements.
- High Gentamycin concentrations in drainage fluid and peri-prosthetic tissues, with low blood levels.
- Sustained elevated intra-osseous Gentamycin levels (4x MIC) for up to one year in sheep.
Conclusions:
- Antibiotic-loaded cement provides effective, prolonged local antibiotic delivery for orthopedic infections and prophylaxis.
- This method achieves superior tissue concentrations compared to injection, with minimal systemic risk.
- Further research into broader-spectrum antibiotics in cement formulations is warranted.