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Related Concept Videos

Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...

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Related Experiment Video

Updated: May 12, 2026

Reverse Total Shoulder Arthroplasty
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Modular baseplate augmentation: a simple and effective method for addressing eccentric glenoid wear.

Jason Corban1, Adam R Bowler2, Evan A Glass2

  • 1Department of Orthopaedic Surgery, New England Baptist Hospital, Boston, MA, USA.

Journal of Shoulder and Elbow Surgery
|August 7, 2024
PubMed
Summary
This summary is machine-generated.

Modular baseplate augmentation for reverse total shoulder arthroplasty showed comparable stability to nonaugmented designs. This novel ringed baseplate with augmentation offers precise defect filling and preserves bone, optimizing long-term implant stability.

Keywords:
Augmented baseplatebiomechanical studyeccentric glenoid wearglenoid bone lossimplant stabilitymicromotionmodular augmentationreverse total shoulder arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Implant Design

Background:

  • Augmented baseplates address eccentric glenoid wear in reverse total shoulder arthroplasty (RTSA).
  • Current augmented implants often require extensive reaming for proper seating, potentially compromising stability.
  • Modular augmentation may offer precise defect filling and bone preservation.

Purpose of the Study:

  • To assess the stability of a novel ringed baseplate with modular augmentation.
  • To compare its stability against nonaugmented standard and ringed baseplate designs.

Main Methods:

  • A biomechanical study tested baseplate micromotion using American Society for Testing and Materials guidelines.
  • Three constructs were evaluated: nonaugmented curved baseplate, nonaugmented ringed baseplate, and a ringed baseplate with 8-mm modular augmentation.
  • Micromotion was measured before and after 100,000 cycles of cyclic loading on polyurethane foam blocks with simulated defects.

Main Results:

  • Both nonaugmented and augmented ringed baseplates exhibited significantly less micromotion than the nonaugmented curved baseplate before cyclic loading (P = .009).
  • After cyclic loading, ringed constructs continued to show significantly less micromotion than the curved design (P < .001).
  • Micromotion for both ringed constructs remained below the 150 μm threshold for bony ingrowth.

Conclusions:

  • Locked modular augmentation of a ringed baseplate does not increase micromotion compared to nonaugmented designs in simulated glenoid defects.
  • This design allows for tailored augmentation, accommodating glenoid anatomy and reducing the need for excessive reaming.
  • The system optimizes the environment for long-term implant stability in RTSA.