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The release of gentamicin from polymethylmethacrylate beads. An experimental and pharmacokinetic study
Abstract:
Gentamicin incorporated in beads of polymethylmethacrylate has been shown capable of being released over a period of several months in concentrations sufficiently high to control most pathogens. The therapeutic efficacy of such beads has been demonstrated in a model of osteomyelitis of the femur in the dog. Good tolerance has been shown, both in the animal model and in tissue cultures. In forty-one patients with infection of either bone or soft tissue, mainly of the lower limb, the findings were similar. The concentrations in serum and urine were low, which excludes side-effects. The insertion of gentamicin-PMMA beads may prove to be a valuable new form of local antibiotic therapy.
Insights
Gentamicin-polymethylmethacrylate beads provide effective local antibiotic therapy for bone and soft tissue infections, releasing therapeutic concentrations for months with minimal systemic side effects.
Area of Science:
- Orthopedics
- Infectious Diseases
- Biomaterials Science
Background:
- Local antibiotic delivery is crucial for treating bone and soft tissue infections.
- Polymethylmethacrylate (PMMA) beads offer a potential matrix for sustained drug release.
Purpose of the Study:
- To evaluate the efficacy and safety of gentamicin-PMMA beads for local antibiotic therapy.
- To assess gentamicin release kinetics and systemic absorption.
Main Methods:
- Gentamicin-PMMA beads were prepared and characterized.
- Therapeutic efficacy was tested in a canine osteomyelitis model.
- Human patients with bone/soft tissue infections received bead implantation.
- Serum and urine gentamicin levels were monitored.
Main Results:
- Beads released effective gentamicin concentrations for several months.
- Significant control of pathogens was observed in animal models and human patients.
- Low serum and urine gentamicin levels indicated minimal systemic absorption.
- Good local tissue tolerance was demonstrated.
Conclusions:
- Gentamicin-PMMA beads represent a valuable new method for local antibiotic administration.
- This approach offers effective infection control with a favorable safety profile.
- Sustained local antibiotic delivery via PMMA beads shows promise for challenging infections.