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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 2/2016

01-02-2016 | Shoulder

Glenohumeral translation in ABER position during muscle activity in patients treated with Latarjet procedure: an in vivo MRI study

Authors: Giovanni Di Giacomo, Paolo Scarso, Andrea De Vita, Mario A. Rojas Beccaglia, Nicole Pouliart, Nicola de Gasperis

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 2/2016

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Abstract

Purpose

The Latarjet procedure is frequently performed when treating traumatic anteroinferior shoulder instability. This procedure is supposed to have a triple effect: osseous, muscular and ligamentous. The main stabilizing mechanism in cadaver studies on fresh-frozen shoulders seems to be the sling effect produced by the subscapularis and the conjoint tendon. It has been hypothesized that muscle contraction in ABER position (abduction–external rotation) is able to translate the humeral head posteriorly and superiorly due to the sling effect. The aim of this study was to analyse the humeral head translation relative to the glenoid with the arm in ABER position with and without muscle contraction.

Methods

Twenty-one subjects divided into two groups (Group A: after Latarjet; Group B: healthy subjects) were examined with an open MRI system with the shoulder in abduction–external rotation (ABER) position to analyse humeral head translation during muscle activity.

Results

In normal shoulders, there was no significant difference in anteroposterior or superoinferior translation between the rest position and the muscle-activated state. In subjects after the Latarjet procedure, the difference was significant and was also significant between both groups of subjects for posterior translation, but not for superior translation.

Conclusion

In patients treated with Latarjet procedure, there are significant changes in glenohumeral translation during muscular activity when in ABER position, with the humeral head going more posteriorly, in comparison with normal shoulders. This study confirms the stabilizing sling effect of the transposed conjoint tendon in the ABER position.

Level of evidence

Retrospective case–control study, Level III.
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Metadata
Title
Glenohumeral translation in ABER position during muscle activity in patients treated with Latarjet procedure: an in vivo MRI study
Authors
Giovanni Di Giacomo
Paolo Scarso
Andrea De Vita
Mario A. Rojas Beccaglia
Nicole Pouliart
Nicola de Gasperis
Publication date
01-02-2016
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 2/2016
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-015-3896-x

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