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

  • Orthopaedic Surgery
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

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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Acknowledgments

We thank Depuy Synthes und Heraeus Medical for their technical support.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Medical School Hannover, Anna-von-Borries-Straße 1-7, 30625, Hannover, Germany

    Marc-Frederic Pastor, Mathias Wellmann & Tomas Smith

  2. Laboratory of Biomechanics and Biomaterials, Medical School Hannover, Anna-von Borries-Str. 1-7, 30625, Hannover, Germany

    Manuel Kraemer & Christof Hurschler

Authors
  1. Marc-Frederic Pastor
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  2. Manuel Kraemer
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  4. Christof Hurschler
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Correspondence to Tomas Smith.

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Pastor, MF., Kraemer, M., Wellmann, M. et al. Anterior stability of the reverse shoulder arthroplasty depending on implant configuration and rotator cuff condition. Arch Orthop Trauma Surg 136, 1513–1519 (2016). https://doi.org/10.1007/s00402-016-2560-3

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  • DOI: https://doi.org/10.1007/s00402-016-2560-3

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