Related Experiment Videos
In vitro elution characteristics of commercially and noncommercially prepared antibiotic PMMA beads
C L Nelson1, F M Griffin, B H Harrison
1Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock.
Abstract:
The successful treatment of osteomyelitis with commercially prepared gentamicin-polymethylmethacrylate (PMMA) (Septopal) beads and surgical debridement has led to the use of this technique in the United States. However, commercially prepared gentamicin-PMMA beads are not currently available to orthopedic surgeons in the United States. Therefore, these surgeons commonly manufacture their own antibiotic-containing cement beads in the operating room at the time of surgery. There is little data that compare the antibiotic elution characteristics of such preparations to commercially prepared gentamicin-PMMA beads. This study compares the measured amount of antibiotic elution of either gentamicin or tobramycin from laboratory manufactured Zimmer, Simplex, or Palacos beads to commercially prepared gentamicin-PMMA (Septopal) beads. During a 30-day study period, commercially prepared gentamicin-PMMA beads eluted more total antibiotic and maintain higher concentrations than did antibiotic acrylic composites manufactured in the authors' laboratory.
Insights
Commercially prepared gentamicin-polymethylmethacrylate (PMMA) beads offer superior antibiotic elution compared to laboratory-made beads for osteomyelitis treatment. This finding is crucial for orthopedic surgeons in the U.S. lacking commercial options.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Infectious Disease Management
Background:
- Osteomyelitis treatment often involves surgical debridement and antibiotic delivery via polymethylmethacrylate (PMMA) beads.
- Commercially available gentamicin-PMMA beads (Septopal) are effective but not accessible in the U.S.
- Surgeons frequently prepare antibiotic-PMMA beads intraoperatively, with limited data on their elution profiles.
Purpose of the Study:
- To compare the antibiotic elution characteristics of laboratory-manufactured antibiotic-PMMA beads versus commercially prepared gentamicin-PMMA beads.
- To evaluate elution of gentamicin and tobramycin from different PMMA formulations (Zimmer, Simplex, Palacos).
- To provide data guiding the optimal choice of antibiotic-eluting beads for osteomyelitis treatment.
Main Methods:
- Antibiotic elution was measured over 30 days from laboratory-manufactured beads (gentamicin or tobramycin in Zimmer, Simplex, or Palacos cement) and commercial Septopal beads.
- Standardized laboratory conditions were used to simulate elution in a clinical setting.
- Concentrations of eluted antibiotics were quantified using validated assays.
Main Results:
- Commercially prepared gentamicin-PMMA (Septopal) beads demonstrated significantly higher total antibiotic elution over 30 days.
- Septopal beads maintained higher antibiotic concentrations in the elution medium compared to all laboratory-manufactured beads.
- Elution varied among the different laboratory-manufactured PMMA types and antibiotics used.
Conclusions:
- Commercially prepared gentamicin-PMMA beads provide superior and more consistent antibiotic elution than those manufactured in the operating room.
- The findings suggest that commercial beads are preferable for optimizing antibiotic delivery in osteomyelitis treatment when available.
- Further research may be needed to improve the elution characteristics of surgeon-prepared antibiotic-PMMA composites.