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Archives of Orthopaedic and Trauma Surgery

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26.08.2016 | Orthopaedic Surgery

Anterior stability of the reverse shoulder arthroplasty depending on implant configuration and rotator cuff condition

verfasst von: Marc-Frederic Pastor, Manuel Kraemer, Mathias Wellmann, Christof Hurschler, Tomas Smith

Erschienen in: Archives of Orthopaedic and Trauma Surgery | Ausgabe 11/2016

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Abstract

Introduction

The aim of this study was to investigate the stabilizing influence of the rotator cuff as well as the importance of glenosphere and onlay configuration on the anterior stability of the reverse total shoulder replacement (RTSR).

Materials and methods

A reverse total shoulder replacement was implanted into eight human cadaveric shoulders, and biomechanical testing was performed under three conditions: after implantation of the RTSR, after additional dissection of the subscapularis tendon, and after additional dissection of the infraspinatus and teres minor tendon. Testing was performed in 30° of abduction and three rotational positions: 30° internal rotation, neutral rotation, and 30° external rotation. Furthermore, the 38-mm and 42-mm glenospheres were tested in combination with a standard and a high-mobility humeral onlay. A gradually increased force was applied to the glenohumeral joint in anterior direction until the RTSR dislocated.

Results

The 42-mm glenosphere showed superior stability compared with the 38-mm glenosphere. The standard humeral onlay required significantly higher anterior dislocation forces than the more shallow high-mobility onlay. External rotation was the most stable position. Furthermore, isolated detachment of the subscapularis and combined dissection of the infraspinatus, teres minor, and subscapularis tendon increased anterior instability.

Conclusions

This study showed superior stability with the 42-mm glenosphere and the more conforming standard onlay. External rotation was the most stable position. Detachment of the subscapularis as well as dissection of the complete rotator cuff decreased anterior stability.

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Titel: Anterior stability of the reverse shoulder arthroplasty depending on implant configuration and rotator cuff condition
verfasst von: Marc-Frederic Pastor
Manuel Kraemer
Mathias Wellmann
Christof Hurschler
Tomas Smith
Publikationsdatum: 26.08.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Archives of Orthopaedic and Trauma Surgery / Ausgabe 11/2016
Print ISSN: 0936-8051
Elektronische ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-016-2560-3

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