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The variable-axis knee prosthesis. Two-year follow-up study

D G Murray, D A Webster

    The Journal of Bone and Joint Surgery. American Volume
    |June 1, 1981
    PubMed
    Summary
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    This study evaluated the variable-axis knee prosthesis in 55 replacements, finding 79% good to excellent subjective results after two years. The prosthesis shows promise in preventing prosthetic loosening, a common complication.

    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering
    • Clinical Outcomes Research

    Background:

    • Knee replacement surgery aims to restore function and alleviate pain.
    • Prosthetic loosening is a significant long-term complication of knee arthroplasty.
    • Variable-axis knee prostheses are designed to improve rotational freedom and stability.

    Purpose of the Study:

    • To report the clinical outcomes of knee replacement using the variable-axis prosthesis.
    • To assess the subjective and objective results at a minimum two-year follow-up.
    • To evaluate the incidence of complications, particularly prosthetic loosening.

    Main Methods:

    • Prospective clinical study of 55 consecutive knee replacements.
    • Minimum two-year follow-up period for all patients.

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  • Independent evaluator assessed subjective patient outcomes and clinical findings.

    • Main Results:

    • 79% of patients reported good to excellent subjective results.
    • 15% experienced fair results, often due to patellar discomfort or instability.
    • 6% of cases failed, primarily due to infection or persistent pain; no component loosening was observed.

    Conclusions:

    • The variable-axis knee prosthesis demonstrates promising clinical results in the short to medium term.
    • The design may help mitigate the risk of prosthetic loosening.
    • Further long-term studies are warranted to confirm durability and efficacy.