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Bulk effect of the deltoid muscle on the glenohumeral joint

Rosso, Claudio and Mueller, Andreas M. and McKenzie, Brett and Entezari, Vahid and Cereatti, Andrea and Della Croce, Ugo and Ramappa, Arun J. and Nazarian, Ara and De Angelis, Joseph P. (2014) Bulk effect of the deltoid muscle on the glenohumeral joint. Journal of experimental orthopaedics, Vol. 1 (14). eISSN 2197-1153. Article.

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DOI: 10.1186/s40634-014-0014-9

Abstract

Background There remains controversy on the role of the deltoid on glenohumeral translations during basic and pitching motions. We thus studied the passive effect of the deltoid on the deltoid glenohumeral joint center (GHJC).
Methods Six shoulders were tested using an automated mechanical system. A baseline motion pattern of the intact specimen was contrasted with glenohumeral translation after removal of the deltoid. Each condition was evaluated in abduction (ABD) and an abbreviated throwing motion (ATM) using retro-reflective, bone-embedded markers. The absolute trajectory and the area under the curve (AUC) for each motion were calculated and glenohumeral kinematics with respect to the GH translation were compared.
Results The removal of the deltoid resulted in significant changes of the GH translation. During 30-60° of ABD, it resulted in a superior and more anterior GH translation, while in the 60-90° segment in a more inferior and medial GH translation. During 90-120°, the GH translation was medialized. In the pitching motion from maximum external rotation to 90° of external rotation (ER), the removal of the deltoid resulted in a more superior, anterior and lateral GH translation. Thus limits anterior translation in the abduction-external rotation position. In the remaining segments (90-80° and 80-45° of ER), it resulted in a lateralization of the GH translation.
Conclusions Modelling the throwing shoulder, the deltoid has a significant influence on glenohumeral motion. Athletes with deltoid dysfunction and limited range of motion are at risk for injury due to the resulting change in their throwing mechanics.

Item Type:Article
ID Code:10281
Status:Published
Refereed:Yes
Uncontrolled Keywords:Bulk effect, shoulder, biomechanics, pitching, deltoid muscle, motion analysis
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/06 Bioingegneria elettronica e informatica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Politiche, Scienze della Comunicazione e Ingegneria dell'Informazione
Publisher:SpringerOpen
eISSN:2197-1153
Copyright Holders:© 2014 Rosso et al.; licensee Springer
Deposited On:10 Nov 2014 10:33

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