CLINICAL OUTCOMES BASED ON FINAL BASEPLATE VERSION IN REVERSE TOTAL SHOULD ARTHROPLASTY

Document Type

Conference Proceeding

Publication Date

9-1-2023

Publication Title

JSES International

Abstract

Background: While surgeons attempt to place the baseplate of a reverse total shoulder arthroplasty (rTSA) close to neutral version, outcomes based on the final version remain unknown. The purpose of this study is to determine the clinical and radiographic outcomes of rTSA based on the amount of retroversion the baseplate is placed in to determine if increasing retroversion affects the outcomes. Methods: All primary rTSA patients in a multicentered international database with a 2-year minimum follow-up implanted with computer navigation so the final baseplate version is known were included. A single medialized glenoid/lateralized humerus rTSA implant system was used. Patients were stratified by their final version: <0° (anteversion), 0 to 5° of retroversion, 6-10°, and >10°. Motion, outcome scores and radiographic outcomes were compared between groups using ANOVA with Tukey HSD post tests and chi square. Results: Four hundred and fourteen patients (189 females/225 males) were identified, with a mean follow-up of 30 months. Demographics were similar between the 4 groups. The mean native version was 10.3°, and the mean postoperative version was 3.1°. Preoperatively, 46% were >10°, 25% 6-10°, 18% 0-5° and 11% anteverted. Postoperatively, 3% were >10°, 23% 6-10°, 68% 0-5° and 6% anteverted. Postoperatively, there were no significant differences between the 4 groups with regards to outcome scores or motion, except for abduction greater in the >10° retroversion group that exceeded the MCID. At follow-up, pain scores, patient satisfaction, notching and complications were similar between the groups. Conclusions: This study demonstrated that computer navigation was highly efficacious, placing 97% of patient in 10° or less of retroversion or in anteversion. Except for abduction, there were no significant differences with regards to motion, pain relief, outcome scores, patient satisfaction or complications between the different groups based on the final implanted version. rTSA baseplates can be placed in anteversion or up to 10° of retroversion. The outcomes of patients left in 15° or greater retroversion could not be answered by this study since the use computer navigation left very few patients with postoperative retroversion >10°.

Volume

7

Issue

5

First Page

944

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