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Total shoulder replacement with a constrained prosthesis

M Post, S S Haskell, M Jablon

    The Journal of Bone and Joint Surgery. American Volume
    |April 1, 1980
    PubMed
    Summary
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    This study on shoulder joint replacements found that a modified constrained joint design significantly reduced material failures from twelve to two. The new design also allowed for controlled dislocation, enhancing patient safety in shoulder arthroplasty.

    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering
    • Materials Science

    Background:

    • Shoulder joint replacements are common orthopedic procedures.
    • Constrained shoulder prostheses aim to improve stability but can be prone to material failure.
    • Previous designs experienced a high rate of material failure.

    Purpose of the Study:

    • To evaluate the efficacy of a modified constrained shoulder joint prosthesis.
    • To assess the impact of design modifications on material failure rates.
    • To investigate the safety and fixation of the glenoid component.

    Main Methods:

    • Forty-three shoulder joint replacements were performed in forty-two patients.
    • A series of twenty-two initial prostheses were compared with a subsequent series of twenty-one modified prostheses.

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  • The study monitored material failures and component fixation.

    • Main Results:

    • Material failures decreased significantly from twelve in the initial series to two in the modified series.
    • No loosening of glenoid components was observed, though radiolucent lines were noted.
    • The design incorporated a feature allowing controlled dislocation of the metal head at a specific torque.

    Conclusions:

    • The modified constrained shoulder joint prosthesis demonstrated improved durability and reduced material failures.
    • The design's controlled dislocation feature may enhance patient safety.
    • Strong glenoid-scapula attachment was achieved through specific insertion methods and design considerations.