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Calcium hydroxyapatite ceramic used as a delivery system for antibiotics
Y Shinto1, A Uchida, F Korkusuz
1Department of Orthopaedic Surgery, Osaka University Medical School, Japan.
Summary
Calcium hydroxyapatite ceramic blocks offer sustained antibiotic release, showing effectiveness for up to 12 weeks. This biocompatible system avoids thermal damage and eliminates the need for carrier removal.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Orthopedic Surgery
Background:
- Antibiotic delivery systems are crucial for preventing and treating bone infections.
- Conventional methods often have limitations such as thermal degradation of antibiotics or the need for secondary surgical procedures.
- Calcium hydroxyapatite (CaHA) ceramic shows promise as a biocompatible material for drug delivery.
Purpose of the Study:
- To evaluate porous calcium hydroxyapatite ceramic blocks as sustained-release delivery systems for antibiotics.
- To assess the in vitro elution profiles and in vivo efficacy of antibiotics delivered via CaHA blocks.
- To determine the biocompatibility and mechanical properties of the CaHA drug delivery system.
Main Methods:
- Porous CaHA ceramic blocks with cylindrical cavities were prepared.
- Gentamicin sulphate, cefoperazone sodium, and flomoxef sodium powders were placed in the cavities.
- In vitro elution studies were conducted to measure antibiotic release over time.
- In vivo studies in rats were performed to assess drug release and biocompatibility.
- Histological analysis was used to evaluate tissue response.
Main Results:
- Gentamicin sulphate demonstrated sustained release, with 70% eluted over 12 weeks and concentrations remaining five times the minimum inhibitory concentration for staphylococci.
- In vivo studies in rats showed comparable release rates and levels of gentamicin sulphate into bone tissue.
- Antibiotic activity was preserved, and the CaHA blocks exhibited complete biocompatibility upon histological examination.
- The CaHA system provided mechanical strength and potential for accelerated healing through bone ingrowth.
Conclusions:
- Porous calcium hydroxyapatite ceramic blocks are effective and biocompatible systems for the sustained release of antibiotics.
- This novel delivery method overcomes limitations of existing systems, preventing thermal damage and avoiding secondary surgeries.
- The CaHA ceramic offers mechanical support and may promote bone healing, presenting a promising approach for orthopedic infections.