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Related Concept Videos

Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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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.
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General Case of Eccentric Axial Loading01:12

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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...
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Related Experiment Video

Updated: Jul 12, 2025

Reverse Total Shoulder Arthroplasty
10:10

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Published on: July 5, 2011

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Comparative Analysis of Eccentric Glenosphere in Reverse Total Shoulder Arthroplasty: A Computer Simulation Study.

Xiaopei Xu1, Qingnan Sun1, Yang Liu1

  • 1Department of Orthopedic Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, 100020, People's Republic of China.

International Journal of General Medicine
|October 23, 2023
PubMed
Summary

Anteroinferior glenosphere eccentricity in reverse total shoulder arthroplasty (RSA) significantly improves rotation and total range of motion (ROM). This specific configuration offers advantages over concentric designs for better shoulder function after surgery.

Keywords:
glenosphere eccentricitiesimpingementmuscle lengthnotchingrange of motionreverse shoulder arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Computational Modeling

Background:

  • Reverse total shoulder arthroplasty (RSA) is a common procedure for complex shoulder pathologies.
  • Optimizing implant design, specifically glenosphere positioning, is crucial for improving functional outcomes.
  • Understanding the biomechanical impact of glenosphere eccentricity is essential for surgical planning and implant innovation.

Purpose of the Study:

  • To evaluate the effects of varying glenosphere eccentricities on impingement, range of motion (ROM), and muscle length in reverse total shoulder arthroplasty (RSA).
  • To identify optimal glenosphere configurations for enhanced shoulder function and reduced impingement.
  • To provide computational insights into the biomechanics of RSA with different glenosphere designs.

Main Methods:

  • Utilized computational modeling to simulate native and RSA shoulder movements across abduction-adduction, flexion-extension, and rotation.
  • Tested 36 glenosphere configurations, varying inferior tilts, lateral offsets, and eccentricities (concentric, inferior, posterior, anterior, anteroinferior, posteroinferior).
  • Assessed maximum impingement-free ROM, impingement sites, and muscle lengths for each configuration.

Main Results:

  • All tested glenosphere configurations achieved over 50% of native shoulder ROM.
  • Anteroinferior eccentricity demonstrated a significant advantage in rotation and total global ROM compared to concentric designs.
  • Significant differences in ROM were observed in rotation, with anteroinferior eccentricity showing superior performance.

Conclusions:

  • Glenosphere eccentricity significantly impacts rotational ROM and total global ROM in RSA.
  • Anteroinferior glenosphere eccentricity is associated with maximal ROM in multiple planes and activities.
  • Anteroinferior and inferior glenoid eccentricities offer significant advantages over concentric designs for improved rotational and total global ROM.