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Related Experiment Videos

The tradeoffs associated with modular hip prostheses

J P Collier1, M B Mayor, I R Williams

  • 1Dartmouth Biomedical Engineering Center, Thayer School of Engineering, Dartmouth College, Hanover, NH, USA.

Clinical Orthopaedics and Related Research
|February 1, 1995
PubMed
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Modular hip prostheses offer surgical flexibility but incur higher production costs. Examination of retrieved implants revealed fretting and corrosion as significant issues, particularly in mixed-alloy designs, impacting long-term performance.

Area of Science:

  • Orthopaedic Surgery
  • Biomaterials Science
  • Medical Device Engineering

Background:

  • Modular hip prostheses are designed for increased surgical flexibility.
  • Understanding the trade-offs between modularity and potential failure modes is crucial for implant longevity.
  • Previous research has not fully elucidated the risks associated with modular connections.

Purpose of the Study:

  • To investigate the advantages and disadvantages of modular hip prostheses.
  • To identify common problems associated with modular hip implant connections.
  • To assess the prevalence of fretting and corrosion in retrieved modular hip prostheses.

Main Methods:

  • A questionnaire was distributed to orthopaedic implant manufacturers regarding modular components.

Related Experiment Videos

  • Retrieved modular and non-modular hip prostheses were examined for signs of wear and corrosion.
  • Analysis of retrieved components included assessment of head/neck tapers and mixed-alloy vs. all-alloy combinations.

    • Main Results:

    • Manufacturers confirmed higher production costs for modular designs due to stringent tolerances.
    • Fretting was observed in 4% of examined head/neck tapers.
    • Corrosion rates varied significantly: >30% in mixed-alloy, <10% in all-titanium, and <6% in all-cobalt-alloy components.

    Conclusions:

    • Modular hip prostheses present manufacturing challenges and potential for fretting and corrosion.
    • Mixed-alloy modular components exhibit higher corrosion rates compared to single-alloy designs.
    • Further research is needed to fully understand the long-term clinical impact of modular connection issues.