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dc.contributor.author
Hochreiter, Bettina
dc.contributor.author
Beeler, Silvan
dc.contributor.author
Hofstede, Simon
dc.contributor.author
Sigrist, Bastian
dc.contributor.author
Snedeker, Jess G.
dc.contributor.author
Gerber, Christian
dc.date.accessioned
2024-02-09T14:03:27Z
dc.date.available
2024-01-29T08:04:15Z
dc.date.available
2024-02-09T14:03:27Z
dc.date.issued
2023-06-01
dc.identifier.issn
2197-1153
dc.identifier.other
10.1186/s40634-023-00623-x
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/655854
dc.identifier.doi
10.3929/ethz-b-000655854
dc.description.abstract
Purpose Primary glenohumeral osteoarthritis is commonly associated with static posterior subluxation of the humeral head. Scapulae with static/dynamic posterior instability feature a superiorly and horizontally oriented acromion. We investigated whether the acromion acts as a restraint to posterior humeral translation. Methods Five three-dimensional (3D) printed scapula models were biomechanically tested. A statistical shape mean model (SSMM) of the normal scapula of 40 asymptomatic shoulders was fabricated. Next, a SSMM of scapular anatomy associated with posterior subluxation was generated using data of 20 scapulae (“B1”). This model was then used to generate three models of surgical correction: glenoid version, acromial orientation, and acromial and glenoid orientation. With the joint axially loaded (100N) and the humerus stabilized, an anterior translation force was applied to the scapula in 35°, 60° and 75° of glenohumeral flexion. Translation (mm) was measured. Results In the normal scapula, the humerus translates significantly less to contact with the acromion compared to all other configurations (p < .000 for all comparisons; i.e. 35°: “normal” 8,1 mm (± 0,0) versus “B1” 11,9 mm (± 0,0) versus “B1 Acromion Correction” 12,2 mm (± 0,2) versus “B1 Glenoid Correction” 13,3 mm (± 0,1)). Restoration of normal translation was only achieved with correction of glenoid and acromial anatomy (i.e. 75°: “normal” 11 mm (± 0,8) versus “B1 Acromion Correction” 17,5 mm (± 0,1) versus “B1 Glenoid Correction” 19,7 mm (± 1,3) versus “B1 Glenoid + Acromion Correction” 11,5 mm (± 1,1)). Conclusions Persistence or recurrence of static/dynamic posterior instability after correction of glenoid version alone may be related to incomplete restoration of the intrinsic stability that is conferred by a normal acromial anatomy.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Springer
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Posterior shoulder instability
en_US
dc.subject
Humeral head subluxation
en_US
dc.subject
Static posterior
en_US
dc.subject
Walch B1
en_US
dc.subject
Acromion
en_US
dc.subject
Shoulder
en_US
dc.subject
Anatomy
en_US
dc.title
Posterior stability of the shoulder depends on acromial anatomy: a biomechanical study of 3D surface models
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Journal of Experimental Orthopaedics
ethz.journal.volume
10
en_US
ethz.journal.issue
1
en_US
ethz.pages.start
59
en_US
ethz.size
9 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02518 - Institut für Biomechanik / Institute for Biomechanics::03822 - Snedeker, Jess G. / Snedeker, Jess G.
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02518 - Institut für Biomechanik / Institute for Biomechanics::03822 - Snedeker, Jess G. / Snedeker, Jess G.
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02518 - Institut für Biomechanik / Institute for Biomechanics::03822 - Snedeker, Jess G. / Snedeker, Jess G.
en_US
ethz.date.deposited
2024-01-29T08:04:15Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2024-02-09T14:03:29Z
ethz.rosetta.lastUpdated
2024-02-09T14:03:29Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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