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Published in: Archives of Orthopaedic and Trauma Surgery 4/2021

01-04-2021 | Orthopaedic Surgery

Is limited shoulder abduction associated with poor scapulothoracic mobility after reverse shoulder arthroplasty?

Authors: Bernd Friesenbichler, Andrea Grassi, Cécile Grobet, Laurent Audigé, Barbara Wirth

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 4/2021

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Abstract

Introduction

The contribution of the glenohumeral joint to shoulder abduction is acknowledged as an important factor for reverse total shoulder arthroplasty (RTSA) patients. In contrast, the degree of scapulothoracic joint contribution and its relation to RTSA patients with poor to excellent shoulder abduction are unclear.

Materials and methods

Twenty-three selectively recruited patients (74 ± 7 years, 11 males) with shoulder abduction ranging from poor to excellent at least 6 months after primary, unilateral RTSA participated in this study. Individual scapulothoracic and glenohumeral contributions at maximum shoulder abduction in the scapular plane were measured using 3D motion capture and correlations between scapulothoracic and glenohumeral contributions to shoulder abduction were assessed. Multiple regression analysis was used to determine the influence of age, body mass index, follow-up period, abduction strength and passive glenohumeral mobility on scapulothoracic and glenohumeral function.

Results

Maximum shoulder abduction (range 48°–140°) was not significantly correlated with the scapulothoracic contribution (range 39°–75°, r = 0.40, p = 0.06), but there was a strong and significant correlation with the glenohumeral contribution (range − 9°–83°, r = 0.91, p < 0.001). Abduction strength was strongly associated with glenohumeral (p = 0.006) but not scapulothoracic (p = 0.34) joint contributions.

Conclusions

Limited shoulder abduction is not associated with insufficient scapulothoracic mobility, which rather provides a basic level of function for RTSA patients. Good to excellent shoulder abduction could only be achieved by increasing the glenohumeral contribution that was associated with postoperative abduction strength.
Literature
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Metadata
Title
Is limited shoulder abduction associated with poor scapulothoracic mobility after reverse shoulder arthroplasty?
Authors
Bernd Friesenbichler
Andrea Grassi
Cécile Grobet
Laurent Audigé
Barbara Wirth
Publication date
01-04-2021
Publisher
Springer Berlin Heidelberg
Published in
Archives of Orthopaedic and Trauma Surgery / Issue 4/2021
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-020-03445-z

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