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Related Experiment Videos

Polycentric total knee arthroplasty: a prognostic assessment.

R S Bryan, L F Peterson

    Clinical Orthopaedics and Related Research
    |November 1, 1979
    PubMed
    Summary
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    Polycentric total knee arthroplasty showed good results in most patients up to 7 years. However, failures were linked to infection, loosening, and pain, indicating a need for improved non-constrained prostheses.

    Area of Science:

    • Orthopedic surgery
    • Biomaterials science

    Background:

    • Polycentric total knee arthroplasty (TKA) has been utilized since 1970.
    • Concerns exist regarding wear from methacrylate particles in TKA.

    Purpose of the Study:

    • To evaluate the long-term outcomes of polycentric TKA.
    • To identify failure modes and assess the efficacy of this prosthesis.

    Main Methods:

    • Comparison of two groups (106 and 101 knees) undergoing polycentric TKA.
    • Follow-up assessments at 5 and 7 years post-surgery.

    Main Results:

    • Despite methacrylate particle exposure, wear was not a significant issue.
    • Failure causes included infection, tibial component loosening/settling, instability, and persistent pain.

    Related Experiment Videos

  • Good results were observed in 61-75% of osteoarthritic knees and 64-72% of rheumatoid knees at 7 years.

    • Conclusions:

    • Polycentric TKA can achieve satisfactory outcomes but is prone to specific failure modes.
    • A need persists for improved, well-tolerated, non-constrained resurfacing prostheses.