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Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_11 | Pages 353 - 353
1 Jul 2014
Hamilton M Diep P Roche C Flurin P Wright T Zuckerman J Routman H
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Summary Statement

Reverse shoulder design philosophy can impact external rotation moment arms. Lateralizing the humerus can increase the external rotator moment arms relative to normal anatomy.

Introduction

The design of reverse shoulders continues to evolve. These devices are unique in that they are not meant to reproduce the healthy anatomy. The reversal of the fulcurm in these devices impacts every muscle that surrounds the joint. This study is focused on analyzing the moment arms for the rotator cuff muscles involved in internal and external rotation for a number of reverse shoulder design philosophies.