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Published in: Archives of Orthopaedic and Trauma Surgery 7/2018

01-07-2018 | Orthopaedic Surgery

Replacement options for the B2 glenoid in osteoarthritis of the shoulder: a biomechanical study

Authors: Boris Sowa, Martin Bochenek, Steffen Braun, Felix Zeifang, Jan Philippe Kretzer, Thomas Bruckner, Gilles Walch, Patric Raiss

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 7/2018

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Abstract

Background

Glenoid replacement in cases of severe glenoid retroversion (RV) or eccentric wear is challenging. The aim of this study was to evaluate different treatment methods under standardized conditions to assist surgeons in the decision-making process.

Methods

Three treatment options for severe glenoid RV (15°) were compared: (1) no RV correction; (2) complete RV correction; (3) no RV correction and implantation of a posterior augmented glenoid (PAG). A highly standardized implantation protocol using artificial glenoid bones (five per group) was chosen, and a physiologic shoulder movement was applied in a biomechanical setting. Micromotions (MM) between glenoid components and bone were quantified using an optical 3D measuring system.

Results

In the uncorrected retroversion group, three instances of subluxation of the prosthetic head occurred between 2000 and 4000 cycles. At 2000 cycles, significantly more MM were observed in the uncorrected RV group than in the corrected RV group (p < 0.0001) or to the augmented group (p < 0.0001). At 10|000 cycles, more MM were observed in the posterior augmented group than in the corrected RV group (p < 0.0001).

Conclusion

If sufficient bone stock is available, retroversion correction should be favored. Posterior augmented glenoids seem to be a suitable treatment option if complete correction of the retroversion is not possible without compromising the glenoid vault. Without correction of the retroversion, high failure rates were observed.
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Metadata
Title
Replacement options for the B2 glenoid in osteoarthritis of the shoulder: a biomechanical study
Authors
Boris Sowa
Martin Bochenek
Steffen Braun
Felix Zeifang
Jan Philippe Kretzer
Thomas Bruckner
Gilles Walch
Patric Raiss
Publication date
01-07-2018
Publisher
Springer Berlin Heidelberg
Published in
Archives of Orthopaedic and Trauma Surgery / Issue 7/2018
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-018-2915-z

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