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Experience with the variable axis knee prosthesis.

R Rutledge, D A Webster, D G Murray

    Clinical Orthopaedics and Related Research
    |April 1, 1986
    PubMed
    Summary
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    Variable axis total knee arthroplasties show no significant outcome decline 5-9 years post-implantation. Patellar issues decreased with improved surgical techniques and component design, indicating good long-term results.

    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Variable axis total knee arthroplasty (TKA) is a surgical procedure for knee joint replacement.
    • Assessing long-term outcomes and complications of TKA is crucial for patient management and device improvement.

    Purpose of the Study:

    • To evaluate the long-term efficacy and safety of variable axis total knee arthroplasties.
    • To identify changes in complication rates and outcomes over a five-to-nine-year follow-up period.

    Main Methods:

    • Retrospective analysis of 245 variable axis total knee arthroplasties.
    • Assessment of clinical outcomes and local complications at five to nine years post-implantation.

    Main Results:

    • No significant deterioration in overall results was observed between five and nine years after implantation.

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  • A reduction in patellar problems was noted, attributed to the use of patellar buttons, wider femoral flanges, and lateral retinacular release.
  • Reported local complications included severe patellar problems (6.9%), ligamentous laxity (2.9%), aseptic loosening (1.2%), deep infections (2.0%), supracondylar fractures (1.2%), and peroneal nerve palsy (1.6%).

    • Conclusions:

    • Variable axis total knee arthroplasty demonstrates durable results with acceptable complication rates at long-term follow-up.
    • Surgical modifications have effectively mitigated previously reported patellar complications, enhancing the procedure's overall success.