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Updated: Sep 26, 2025

Reverse Total Shoulder Arthroplasty
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Baseplate retroversion does not affect postoperative outcomes after reverse shoulder arthroplasty.

Randa Elmallah1, Daniel Swanson2, Kiet Le3

  • 1Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Journal of Shoulder and Elbow Surgery
|April 16, 2022
PubMed
Summary

Glenoid component retroversion in reverse shoulder arthroplasty (RSA) did not significantly impact functional outcomes or complications. This study found no difference in outcomes for RSA patients with retroversion ≤15° versus >15°.

Keywords:
Reverse total shoulder arthroplastyclinical outcomeglenoid retroversion

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical imaging analysis

Background:

  • Concerns exist regarding excessive glenoid component retroversion in reverse shoulder arthroplasty (RSA) potentially causing biomechanical issues and baseplate failure.
  • Existing literature lacks clear definition on glenoid baseplate positioning's effect on functional outcomes in RSA.
  • This study addresses the gap by evaluating glenoid retroversion in RSA patients.

Purpose of the Study:

  • To assess the correlation between pre- and postoperative glenoid retroversion in RSA.
  • To determine the impact of glenoid retroversion on functional outcomes, range of motion, and complications.
  • To investigate if specific degrees of retroversion influence RSA performance.

Main Methods:

  • Retrospective review of 271 RSA patients (2017-2019).
  • Preoperative CT scans for initial retroversion, axillary radiographs for postoperative assessment.
  • Outcome measures included clinical scores (ASES, VAS, SANE), range of motion, and radiographic analysis for complications.

Main Results:

  • No significant differences in functional scores (ASES, VAS, SANE) or range of motion between groups with retroversion ≤15° and >15°.
  • Similar low rates of baseplate failure (1 per group) and radiographic loosening observed.
  • Mean change in retroversion was minimal (1° and 4°).

Conclusions:

  • Glenoid baseplate retroversion in RSA does not significantly affect postoperative functional outcomes.
  • Range of motion and complication rates were comparable regardless of retroversion degree.
  • Preserving glenoid bone stock without strict retroversion goals appears safe and effective.