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Related Experiment Videos

Fracture hip prostheses due to welding defects

R Kousbroek, P Ducheyne, G Van der Perre

    Archives of Orthopaedic and Traumatic Surgery. Archiv Fur Orthopadische Und Unfall-Chirurgie
    |January 1, 1981
    PubMed
    Summary

    Metallic failure in Moore type hip prostheses was linked to welding defects. Both stem and head fractures resulted from poor welding, highlighting the need for optimized welding conditions in cobalt-chromium-molybdenum alloy implants.

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    Area of Science:

    • Biomaterials Engineering
    • Orthopedic Surgery
    • Materials Science

    Background:

    • Moore type hip prostheses made of cast Cobalt-Chromium-Molybdenum (Co-Cr-Mo) alloy are used in orthopedic surgery.
    • Metallic failure of these implants can lead to adverse patient outcomes.

    Purpose of the Study:

    • To investigate the causes of metallic failure in two retrieved Moore type hip prostheses.
    • To identify the role of the welding process in implant fractures.

    Main Methods:

    • Metallurgical examination of fractured hip prosthesis components.
    • Analysis of fracture surfaces and weld integrity.
    • Comparison of weld quality with similar devices.

    Main Results:

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  • A fatigue fracture in the prosthesis stem was associated with abrupt cross-sectional changes and inappropriate welding beads, causing stress concentration.
  • A fracture in the hollow femoral head occurred through an incomplete weld, indicating poor welding uniformity.
  • Both failures were directly linked to issues within the welding process.

    • Conclusions:

    • The welding process is a critical factor in the failure of cast Co-Cr-Mo-alloy hip prostheses.
    • Optimizing welding conditions is essential to improve the reliability and longevity of these implants.
    • Further research into optimal welding parameters for Co-Cr-Mo alloys is warranted.