Glenoid inclination in reverse total shoulder arthroplasty with and without baseplate wedge augmentation: a retrospective comparative study.

Authors

Riki D Wylie, Clement Chan, Jay R Ebert, Travis M Falconer

Published in

Journal of shoulder and elbow arthroplasty. Volume 10. Issue 4. Pages 100090. Epub Sep 09, 2026.

Abstract

Superior inclination of the glenoid component in reverse shoulder arthroplasty (rTSA) is avoided due to the associated risks of impaired range of motion, scapular notching, glenoid loosening, and instability. Metallic wedge baseplates have been explored as an augment to rTSA that corrects pre-operative superior angulation while preserving native bone. The aim of this study was to compare glenoid inclination between rTSAs with standard and wedge augmented baseplates.
This was a single-center retrospective comparative study. Two independent reviewers assessed de-identified shoulder x-rays and computed tomography (CT) images for all patients who underwent rTSA by a single surgeon from June 2022 to June 2025. Patients received either an Aequalis Reversed II standard baseplate or a Tornier Perform 15° full wedge augmented baseplate. Pre-operative inclination was measured using total shoulder arthroplasty (TSA) angle, rTSA angle, and Stryker Blueprint. Post-operative inclination was measured with the rTSA angle on x-ray to assess correction.
The study included 106 shoulders from 103 patients who underwent rTSA (49 standard, 57 wedge). For inter-rater reliability, intraclass correlation coefficients were 0.911 and 0.905 for the pre-operative x-ray and CT TSA angles and 0.931 and 0.844 for the pre-operative x-ray and CT rTSA angles. A significant and large correlation (r = 0.64, P < .001) was observed between pre-operative Stryker Blueprint™ and measured TSA angles and between x-ray and CT methods in assessment of pre-operative TSA (r = 0.62, P < .001) and rTSA (r = 0.58, P < .001) angles. Overall, a significant reduction (P < .001) in the rTSA angle was observed from pre- to post-surgery (-20^° ± 10^° [standard -24° ± 10°; wedge -15° ± 8^°]). There was no pre-operative difference (P = .180) in the rTSA angle between the standard and wedge groups; however, the standard group demonstrated a significantly lower (P < .001) rTSA angle post-operatively (standard -6^° ± 8; wedge 1^° ± 8).
Standard baseplates were shown to have a significantly lower rTSA angle post-operatively when compared to the Tornier Perform 15^° full wedge augmented baseplates. Both standard and wedge augmented baseplates significantly reduced superior glenoid inclination.

PMID:
42893254
Bibliographic data and abstract were imported from PubMed on 18 Oct 2026.

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