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Related Experiment Videos

Patellar complications following total knee arthroplasty.

R M Mochizuki, D J Schurman

    The Journal of Bone and Joint Surgery. American Volume
    |September 1, 1979
    PubMed
    Summary

    Complications after total knee arthroplasty, including patellar dislocation and wear, were linked to patellar malalignment and specific prosthetic designs. Surgeons must address both mechanical and anatomical factors during surgery to minimize these issues.

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    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Total knee arthroplasty (TKA) is a common procedure to alleviate knee pain.
    • Patellar complications can significantly impact TKA outcomes.
    • Understanding the factors contributing to patellar issues is crucial for improving surgical success.

    Purpose of the Study:

    • To investigate the incidence and types of patellar complications following TKA.
    • To identify the association between prosthetic design, specifically offset hinge models, and patellar abnormalities.
    • To determine the role of patellar malalignment in these complications.

    Main Methods:

    • Retrospective analysis of eighty-six knees undergoing TKA.
    • Categorization of complications including dislocation, subluxation, and patellar wear.
    • Evaluation of prostheses used: thirty-four unconstrained and fifty-two offset hinge models.
    • Correlation of complications with patellar alignment and prosthetic design.

    Main Results:

    • A significant number of patellar complications were observed, including dislocation (5 knees) and subluxation (18 knees).
    • Patellar malalignment was associated with twenty-three complications.
    • Complications were more prevalent with the offset hinge prosthesis model.
    • Both mechanical prosthetic factors and anatomical abnormalities contributed to the observed issues.

    Conclusions:

    • Patellar complications after TKA are multifactorial, involving prosthetic design and patient anatomy.
    • The offset hinge prosthesis may increase the risk of patellar abnormalities.
    • Inadequate surgical compensation for mechanical and anatomical factors is a key contributor to complications.

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