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Related Experiment Video

Updated: Apr 17, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

44.3K

Glenosphere dissociation after reverse shoulder arthroplasty.

Michael C Cusick1, Michael M Hussey1, Brandon M Steen1

  • 1Florida Orthopaedic Institute, Shoulder and Elbow Service, Tampa, FL, USA.

Journal of Shoulder and Elbow Surgery
|February 7, 2015
PubMed
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Glenosphere dissociation in reverse shoulder arthroplasty (RSA) is linked to larger implant sizes and improper taper engagement. This study analyzed retrieval data and biomechanics to understand dissociation causes and improve RSA outcomes.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Implant retrieval analysis

Background:

  • Reverse shoulder arthroplasty (RSA) is increasingly used for shoulder disorders.
  • While effective, RSA has a high complication rate, including glenosphere dissociation.
  • Few studies have analyzed retrieved RSA implants to understand dissociation mechanisms.

Purpose of the Study:

  • To investigate the incidence and causes of glenosphere dissociation in RSA.
  • To analyze retrieved RSA implants for wear and corrosion.
  • To biomechanically assess the impact of improper Morse taper engagement on glenosphere stability.

Main Methods:

  • Reviewed RSA database for glenosphere dissociation cases (1999-2013).
  • Noted prosthesis type, glenosphere size, and contributing factors.
Keywords:
Morse taperReverse shoulder arthroplastydissociation

Related Experiment Videos

Last Updated: Apr 17, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

44.3K
  • Analyzed five retrieved implants for taper wear/corrosion.
  • Biomechanical testing of Morse taper engagement.

    • Main Results:

    • Identified 13 cases of glenosphere dissociation.
    • Dissociation incidence correlated significantly with larger glenosphere sizes (40mm and 44mm).
    • Improper taper engagement reduced torsional capacity by 60%.

    Conclusions:

    • Glenosphere dissociation in RSA can result from trauma and improper taper engagement.
    • Larger glenospheres (40-44mm) showed a higher incidence of dissociation.
    • Limited evidence of corrosive wear, suggesting mechanical factors are primary drivers.