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Diamond coated total hip replacements

R Lappalainen1, A Anttila, H Heinonen

  • 1Department of Physics, University of Helsinki, Finland.

Clinical Orthopaedics and Related Research
|July 25, 1998
PubMed
Summary
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Amorphous diamond coatings significantly enhance implant materials, improving wear and corrosion resistance for total hip replacements. These biocompatible coatings offer superior performance compared to traditional uncoated metals.

Area of Science:

  • Biomaterials Engineering
  • Surface Science
  • Orthopedic Implants

Background:

  • Diamond exhibits desirable properties for implants, including low friction, high wear and corrosion resistance, and excellent bone bonding.
  • Conventional metal implant materials face challenges with wear, corrosion, and friction.

Purpose of the Study:

  • To evaluate amorphous diamond coatings on common implant alloys for total hip replacement applications.
  • To assess the tribological and corrosion performance of these coated materials.

Main Methods:

  • Amorphous diamond coatings (80% sp3 fraction, 0.2-10 µm thickness) were deposited on stainless steel (AISI316L), Ti6A14V, and CoCrMo using filtered pulsed plasma discharge.
  • Coating adhesion was enhanced using high-energy plasma and intermediate layers.

Related Experiment Videos

  • Tribological tests (pin-on-disk, hip joint simulator) and corrosion tests (10 wt.% HCl) were conducted.

    • Main Results:

    • Amorphous diamond coatings significantly reduced friction coefficients (0.03-0.11) and wear factors (<< 0.1.10(-6) mm3/Nm) compared to uncoated materials.
    • Corrosion rates decreased by 10,000-15,000 times, with no observed coating damage after 6 months.
    • Hip joint simulator tests showed improved friction (0.07) for metal-on-metal implants with diamond coatings.

    Conclusions:

    • Amorphous diamond coatings demonstrably improve wear and corrosion resistance of implant materials.
    • These coatings show great potential for enhancing the longevity and performance of total hip replacement implants.