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Related Experiment Videos

Bacterial adhesion to bisphosphonate coated hydroxyapatite.

A Ganguli1, C Steward, S L Butler

  • 1Bioengineering Unit, Strathclyde University, Wolfson Centre, Glasgow, UK.

Journal of Materials Science. Materials in Medicine
|April 2, 2005
PubMed
Summary

Coating artificial hip joints with pamidronate (P) bisphosphonate significantly increases Staphylococcus aureus (S. aureus) bacterial adhesion to hydroxyapatite (HA) materials. This finding suggests potential limitations for P-coated implants due to increased infection risk.

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Area of Science:

  • Biomaterials Science
  • Orthopaedic Surgery
  • Infectious Diseases

Background:

  • Staphylococcus aureus (S. aureus) infections are a major cause of orthopaedic implant failure, leading to osteomyelitis and bone destruction.
  • Hydroxyapatite (HA) ceramic is used in artificial hip joints, and osteolysis (bone loss) can cause implant loosening.
  • Coating HA with bisphosphonates like clodronate (C) and pamidronate (P) is explored to minimize osteolysis.

Purpose of the Study:

  • To evaluate the effect of bisphosphonate coatings (clodronate and pamidronate) on bacterial adhesion of S. aureus to hydroxyapatite (HA) materials.
  • To determine if bisphosphonate coating influences the risk of implant-associated infection.

Main Methods:

  • Hydroxyapatite (HA) materials were coated with clodronate (C) and pamidronate (P).

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  • Coated and uncoated HA materials were incubated with Staphylococcus aureus (S. aureus).
  • Bacterial adhesion was quantified using the Modified Vortex Device (MVD) method.

    • Main Results:

    • Pamidronate (P)-coated HA showed a significantly greater number of adherent S. aureus compared to uncoated HA (60-fold increase).
    • P-coated HA also exhibited a higher bacterial adhesion than C-coated HA (90-fold increase).
    • Clodronate (C)-coated HA did not show a significant increase in bacterial adhesion compared to uncoated HA.

    Conclusions:

    • While pamidronate (P) may enhance osseointegration, its coating on HA materials significantly increases S. aureus adhesion.
    • The increased bacterial adhesion suggests a potential limitation for P-coated HA implants due to a higher risk of infection.
    • Further research is needed to balance the benefits of bisphosphonate coatings with the risk of implant-associated infections.