Effect of humeral stem design on humeral position and range of motion in reverse shoulder arthroplasty.

Details

Serval ID
serval:BIB_111B2D4AAFB7
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Effect of humeral stem design on humeral position and range of motion in reverse shoulder arthroplasty.
Journal
International Orthopaedics
Author(s)
Lädermann A., Denard P.J., Boileau P., Farron A., Deransart P., Terrier A., Ston J., Walch G.
ISSN
1432-5195 (Electronic)
ISSN-L
0341-2695
Publication state
Published
Issued date
2015
Peer-reviewed
Oui
Volume
39
Number
11
Pages
2205-2213
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
PURPOSE: The impacts of humeral offset and stem design after reverse shoulder arthroplasty (RSA) have not been well-studied, particularly with regard to newer stems which have a lower humeral inclination. The purpose of this study was to analyze the effect of different humeral stem designs on range of motion and humeral position following RSA.
METHODS: Using a three-dimensional computer model of RSA, a traditional inlay Grammont stem was compared to a short curved onlay stem with different inclinations (155°, 145°, 135°) and offset (lateralised vs medialised). Humeral offset, the acromiohumeral distance (AHD), and range of motion were evaluated for each configuration.
RESULTS: Altering stem design led to a nearly 7-mm change in humeral offset and 4 mm in the AHD. Different inclinations of the onlay stems had little influence on humeral offset and larger influence on decreasing the AHD. There was a 10° decrease in abduction and a 5° increase in adduction between an inlay Grammont design and an onlay design with the same inclination. Compared to the 155° model, the 135° model improved adduction by 28°, extension by 24° and external rotation of the elbow at the side by 15°, but led to a decrease in abduction of 9°. When the tray was placed medially, on the 145° model, a 9° loss of abduction was observed.
CONCLUSIONS: With varus inclination prostheses (135° and 145°), elevation remains unchanged, abduction slightly decreases, but a dramatic improvement in adduction, extension and external rotation with the elbow at the side are observed.
Keywords
Arthroplasty, Replacement/methods, Computer Simulation, Humans, Humerus/surgery, Imaging, Three-Dimensional, Joint Prosthesis, Prosthesis Design, Range of Motion, Articular, Rotation, Shoulder Joint/surgery
Pubmed
Web of science
Create date
17/11/2015 17:20
Last modification date
20/08/2019 12:38
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