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Related Experiment Video

Updated: Jun 17, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

Reverse glenoid component fixation: is a posterior screw necessary?

Michael P Hoenig1, Bryan Loeffler, Stephen Brown

  • 1Orthopaedic Associates, Spartanburg, SC, USA. mhoenig@upstateoa.com

Journal of Shoulder and Elbow Surgery
|January 9, 2010
PubMed
Summary

The posterior glenoid screw significantly enhances reverse shoulder arthroplasty stability. Omitting this screw increases loosening, while a long posterior screw (LPS) improves fixation compared to standard screws.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering

Background:

  • Reverse shoulder arthroplasty (RSA) is increasingly used for complex shoulder conditions.
  • Glenoid base plate fixation methods, particularly screw use, vary among prosthetic designs.

Purpose of the Study:

  • To evaluate the stability of the glenoid base plate in RSA.
  • To compare the biomechanical contribution of different posterior glenoid screw configurations.

Main Methods:

  • Cadaveric scapulae were used to test Tornier RTSA glenoid implants.
  • Three screw configurations were tested: no posterior screw (NPS), standard posterior screw (SPS), and long posterior screw (LPS).
  • Cyclic loading (rocking-horse protocol) assessed vertical displacement and loosening over 50,000 cycles.

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Last Updated: Jun 17, 2026

Reverse Total Shoulder Arthroplasty
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Published on: July 5, 2011

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Main Results:

  • NPS constructs showed significantly higher loosening rates than SPS constructs in Group I.
  • LPS constructs demonstrated lower loosening rates than SPS constructs in Group II.
  • NPS constructs had greater initial displacements than SPS in Group I; SPS and LPS were similar in Group II.

Conclusions:

  • The posterior glenoid screw is crucial for glenoid base plate stability in RSA.
  • Using an LPS into the scapular spine can enhance glenoid component fixation when standard screw purchase is suboptimal.