Glenoid retroversion is an important factor for humeral head centration and the biomechanics of posterior shoulder stability

Glenoid retroversion is an important factor for humeral head centration and the biomechanics of... Purpose Glenoid retroversion is a known independent risk factor for recurrent posterior instability. The purpose was to investigate progressive angles of glenoid retroversion and their influence on humeral head centration and posterior transla- tion with intact, detached, and repaired posterior labrum in a cadaveric human shoulder model. Methods A total of 10 fresh-frozen human cadaveric shoulders were investigated for this study. After CT- canning, the gle- noids were aligned parallel to the floor, with the capsule intact, and the humerus was fixed in 60° of abduction and neutral rotation. Version of the glenoid was created after wedge resection from posterior and fixed with an external fixator throughout the testing. Specimens underwent three conditions: intact, detached, and repaired posterior labrum, while version of the glenoid was set from + 5° anteversion to − 25° retroversion by 5° increments. Within the biomechanical setup, the gleno- humeral joint was axially loaded (22 N) to center the joint. At 0° of glenoid version and intact labrum, the initial position was used as baseline and served as point zero of centerization. After cyclic preloading, posterior translation force (20 N) was then applied by a material testing machine, while start and endpoints of the scapula placed on http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Knee Surgery, Sports Traumatology, Arthroscopy Springer Journals

Glenoid retroversion is an important factor for humeral head centration and the biomechanics of posterior shoulder stability

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Publisher
Springer Journals
Copyright
Copyright © 2019 by European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA)
Subject
Medicine & Public Health; Orthopedics
ISSN
0942-2056
eISSN
1433-7347
DOI
10.1007/s00167-019-05573-5
Publisher site
See Article on Publisher Site

Abstract

Purpose Glenoid retroversion is a known independent risk factor for recurrent posterior instability. The purpose was to investigate progressive angles of glenoid retroversion and their influence on humeral head centration and posterior transla- tion with intact, detached, and repaired posterior labrum in a cadaveric human shoulder model. Methods A total of 10 fresh-frozen human cadaveric shoulders were investigated for this study. After CT- canning, the gle- noids were aligned parallel to the floor, with the capsule intact, and the humerus was fixed in 60° of abduction and neutral rotation. Version of the glenoid was created after wedge resection from posterior and fixed with an external fixator throughout the testing. Specimens underwent three conditions: intact, detached, and repaired posterior labrum, while version of the glenoid was set from + 5° anteversion to − 25° retroversion by 5° increments. Within the biomechanical setup, the gleno- humeral joint was axially loaded (22 N) to center the joint. At 0° of glenoid version and intact labrum, the initial position was used as baseline and served as point zero of centerization. After cyclic preloading, posterior translation force (20 N) was then applied by a material testing machine, while start and endpoints of the scapula placed on

Journal

Knee Surgery, Sports Traumatology, ArthroscopySpringer Journals

Published: Jun 28, 2019

References

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