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Related Experiment Videos

Structural arrangements at the interface between plasma sprayed calcium phosphates and bone

J D de Bruijn1, Y P Bovell, C A van Blitterswijk

  • 1Laboratory for Otobiology & Biocompatibility, Biomaterials Research Group, University of Leiden, The Netherlands.

Biomaterials
|June 1, 1994
PubMed
Summary

Amorphous hydroxyapatite coatings promote early bone formation better than highly crystalline ones, showing beneficial degradation. Further studies are needed for conclusive data on bone apposition and long-term implant performance.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Research
  • Materials Science

Background:

  • Plasma-sprayed calcium phosphate coatings are used in orthopedic implants.
  • Varying degrees of crystallinity in hydroxyapatite and other calcium phosphates may affect their biological response.
  • Understanding coating degradation and bone integration is crucial for implant success.

Purpose of the Study:

  • To evaluate the degradation behavior and bone apposition of different plasma-sprayed calcium phosphate coatings.
  • To compare the early biological response of amorphous versus crystalline hydroxyapatite coatings.
  • To investigate potential factors affecting mineralization at the bone-implant interface.

Main Methods:

  • Plasma-sprayed coatings of tetracalcium phosphate, magnesium whitlockite, and hydroxyapatite (varying crystallinity) were implanted in rat femora for 1, 2, and 4 weeks.

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  • Microscopic analyses included light microscopy, scanning electron microscopy, and backscatter electron microscopy.
  • X-ray microanalysis was used to determine elemental composition at the bone-coating interface.

    • Main Results:

    • Tetracalcium phosphate and semi-crystalline hydroxyapatite showed bulk degradation.
    • Amorphous hydroxyapatite exhibited surface degradation with a distinct transition zone.
    • Highly crystalline hydroxyapatite and magnesium whitlockite showed minimal degradation but limited bone contact.
    • Amorphous hydroxyapatite and tetracalcium phosphate coatings demonstrated greater bone apposition.
    • Magnesium whitlockite coatings and adjacent tissue contained aluminum, potentially impairing mineralization.

    Conclusions:

    • Amorphous hydroxyapatite coatings appear more beneficial for early bone formation compared to highly crystalline hydroxyapatite.
    • Degradation characteristics and bone apposition vary significantly among different calcium phosphate coatings.
    • Further research is required to confirm statistical significance in bone apposition rates and assess long-term implant performance.