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The "caviar" madreporic knee prosthesis.

C Kenesi

    Clinical Orthopaedics and Related Research
    |November 1, 1979
    PubMed
    Summary

    The cementless madreporic knee prosthesis uses a unique spherical surface for biologic fixation. While initial human results were mixed, it offers advantages over cemented implants.

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    Area of Science:

    • Orthopedic Surgery
    • Biomaterials Science
    • Biomedical Engineering

    Background:

    • Traditional knee arthroplasty often relies on acrylic cement for fixation.
    • Cemented implants can lead to complications such as loosening, infection, and difficulties in revision surgery.
    • The development of cementless fixation methods is crucial for improving long-term implant survival and patient outcomes.

    Purpose of the Study:

    • To evaluate the efficacy and safety of the novel madreporic (cementless) hinged knee prosthesis.
    • To assess the biologic fixation capabilities of the prosthesis's unique spherical intramedullary stem design.
    • To analyze the initial clinical outcomes and identify potential advantages and limitations of this new implant.

    Main Methods:

    • The study involved experimental canine knee arthroplasties to assess bone ingrowth into the prosthesis's spherical surfaces.
    • Histological analysis was performed to examine the interface between bone and the implant material.
    • An initial clinical series of 15 human cases using the madreporic prosthesis was analyzed for outcomes, including complications and range of motion.

    Main Results:

    • Experimental studies demonstrated bone ingrowth into the madreporic surfaces, indicating potential for solid biologic fixation.
    • Histological examination revealed a fine fibrous tissue layer between bone trabeculae and the metal implant.
    • The initial clinical series of 15 patients showed suboptimal results, including deaths, sepsis, and limited motion, potentially due to patient factors like advanced age and poor bone quality.

    Conclusions:

    • The madreporic knee prosthesis demonstrates potential for cementless biologic fixation, avoiding complications associated with acrylic cement.
    • The implant design offers advantages in ease of insertion and positioning, and facilitates revision surgery.
    • Despite initial challenges in a small patient cohort, further research and noncemented designs warrant continued investigation for improved arthroplasty solutions.

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