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Observations upon the interface between bone and polymethylmethacrylate cement

M A Freeman, G W Bradley, P A Revell

    The Journal of Bone and Joint Surgery. British Volume
    |January 1, 1982
    PubMed
    Summary
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    Radiolucent lines at bone-cement interfaces in total knee replacements are common. This study observed lucencies more frequently at bone-cement interfaces than bone-cobalt chrome interfaces, suggesting a link to macrophages.

    Area of Science:

    • Orthopedic Surgery
    • Biomaterials Science
    • Histopathology

    Background:

    • Radiolucent lines at the bone-prosthesis interface are a common radiographic finding in total joint replacements.
    • The etiology of these lucencies, particularly at the bone-cement interface, remains incompletely understood.
    • Understanding these phenomena is crucial for improving implant longevity and patient outcomes.

    Observation:

    • A unique operative technique allowed for the observation of both bone-cement and bone-cobalt chrome interfaces within 18 total knee replacement implants.
    • The average observation period was 32 months.
    • Radiolucent lines were present at the bone-cement interface in all but one case, while only one case showed lucency at the bone-cobalt chrome interface.

    Findings:

    • A significant difference in the incidence of radiolucent lines was observed between the bone-cement and bone-cobalt chrome interfaces.

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  • Histological examination of one knee revealed macrophages at the bone-cement interface.
  • The findings correlate with recent research identifying macrophages as precursors to osteoclasts.

    • Implications:

    • The study suggests a potential role for macrophage-derived osteoclasts in the formation of bone-cement lucencies.
    • These findings may offer new insights into the biological mechanisms underlying implant loosening.
    • Further research into the cellular and molecular pathways at the bone-cement interface could lead to novel strategies for preventing implant failure.