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Related Experiment Video

Updated: May 4, 2026

Reverse Total Shoulder Arthroplasty
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Design rationale for a posterior/superior offset reverse shoulder prosthesis.

Christopher P Roche, Matthew A Hamilton, Phong Diep

    Bulletin of the Hospital for Joint Disease (2013)
    |December 17, 2013
    PubMed
    Summary
    This summary is machine-generated.

    The posterior-superior offset humeral tray in reverse shoulder arthroplasty better restores anatomic muscle tension and increases external rotation capabilities compared to the non-offset design.

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    Area of Science:

    • Orthopedic biomechanics
    • Surgical implant design

    Background:

    • Reverse shoulder arthroplasty (RSA) is used to treat complex shoulder pathologies.
    • Humeral tray design significantly impacts shoulder biomechanics post-surgery.

    Purpose of the Study:

    • To compare muscle lengths and moment arms between two RSA humeral tray designs.
    • To evaluate the biomechanical effects of a posterior-superior offset tray versus a non-offset tray.

    Main Methods:

    • A computer model simulated internal/external rotation and scapular plane abduction.
    • Muscle lengths and external rotation moment arms were calculated for seven and five muscles, respectively.
    • Simulations included the normal shoulder, a 38 mm non-offset RSA, and a 38 mm posterior-superior offset RSA.

    Main Results:

    • The offset tray resulted in a posterior and superior humeral shift.
    • This shift reduced deltoid elongation and altered muscle adductor/abductor conversion timing.
    • Internal rotation moment arms decreased, while external rotation moment arms increased for specific muscles.

    Conclusions:

    • The posterior-superior offset humeral tray enhances anatomic muscle tensioning.
    • It improves external rotation moment arms, potentially benefiting shoulder strength, stability, and range of motion.