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Experimental osteomyelitis treatment with antibiotic-impregnated hydroxyapatite
Mark E Shirtliff1, Jason H Calhoun, Jon T Mader
1Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717-3980, USA.
Clinical Orthopaedics and Related Research
|August 2, 2002
Summary
Calcium hydroxyapatite implants effectively delivered antibiotics to treat methicillin-resistant Staphylococcus aureus osteomyelitis in rabbits. This shows promise as an alternative to polymethylmethacrylate for localized bone infection treatment.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Infectious Disease Research
Background:
- Osteomyelitis, a bone infection, is challenging to treat, especially with antibiotic-resistant bacteria like methicillin-resistant Staphylococcus aureus (MRSA).
- Local antibiotic delivery systems aim to achieve high drug concentrations at the infection site while minimizing systemic side effects.
Purpose of the Study:
- To evaluate the efficacy of calcium hydroxyapatite (CHA) antibiotic implants as a localized drug delivery system.
- To compare CHA implants with traditional polymethylmethacrylate (PMMA) beads for treating MRSA osteomyelitis in a rabbit model.
Main Methods:
- A localized rabbit tibial osteomyelitis model was established using MRSA.
- Rabbits were treated with various modalities, including debridement, systemic antibiotics, PMMA beads, and CHA implants, with and without antibiotic impregnation (vancomycin).
- Bone cultures were performed after 4 weeks of therapy to assess bacterial clearance.
Main Results:
- Calcium hydroxyapatite implants impregnated with vancomycin achieved an 81.8% infection clearance rate after debridement surgery.
- Polymethylmethacrylate beads impregnated with vancomycin showed a 70% clearance rate.
- All other treatment groups demonstrated less than 50% infection clearance.
Conclusions:
- Calcium hydroxyapatite demonstrates significant potential as an effective local antibiotic delivery vehicle for MRSA osteomyelitis.
- CHA implants may offer an advantageous alternative to PMMA for localized antibiotic therapy in bone infections.