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Knee Surgery, Sports Traumatology, Arthroscopy

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01-02-2015 | Shoulder

Effect of posterior shoulder tightness on internal impingement in a cadaveric model of throwing

Authors: Teruhisa Mihata, Jeffrey Gates, Michelle H. McGarry, Masashi Neo, Thay Q. Lee

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 2/2015

Abstract

Purpose

Posterior shoulder tightness is common in throwing athletes, especially those with symptomatic shoulder internal impingement. The role of posteroinferior capsular contracture in the pathoetiologies of throwing-related injuries caused by shoulder internal impingement remains unclear. The purpose of this study was to assess effect of posterior shoulder tightness on internal impingement in a cadaveric model of throwing.

Methods

Seven fresh-frozen cadaveric shoulders were tested with the shoulder abducted to 90° and at maximum external rotation to simulate the late cocking phase of throwing motion. Glenohumeral joint contact pressure and area through internal impingement, humeral head shift, and the maximum humeral rotation angle were measured. Posteroinferior capsular plication was performed to simulate posteroinferior capsular tightness and induce glenohumeral internal rotation deficit.

Results

Following generation of simulated posteroinferior capsular tightness with resultant glenohumeral internal rotation deficit, glenohumeral contact pressure was significantly increased (P < 0.05), the impinged area of rotator cuff tendon was significantly decreased (P < 0.05), and the humeral head shifted posteriorly (P < 0.05) during shoulder internal impingement.

Conclusion

Excessive posteroinferior capsular tightness can cause forceful internal impingement of the shoulder at maximum external rotation position.

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Title: Effect of posterior shoulder tightness on internal impingement in a cadaveric model of throwing
Authors: Teruhisa Mihata
Jeffrey Gates
Michelle H. McGarry
Masashi Neo
Thay Q. Lee
Publication date: 01-02-2015
Publisher: Springer Berlin Heidelberg
Published in: Knee Surgery, Sports Traumatology, Arthroscopy / Issue 2/2015
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-013-2381-7

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Effect of posterior shoulder tightness on internal impingement in a cadaveric model of throwing

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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