The influence of rotator cuff tear type and weight bearing on shoulder biomechanics in an ex vivo simulator experiment

Genter, Jeremy; Croci, Eleonora; Oberreiter, Birgit; Eckers, Franziska; Bühler, Dominik; Gascho, Dominic; Müller, Andreas M.; Mündermann, Annegret; Baumgartner, Daniel

doi:10.1016/j.jbiomech.2024.112055

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	The influence of rotator cuff tear type and weight bearing on shoulder biomechanics in an ex vivo simulator experiment
Authors:	Genter, Jeremy Croci, Eleonora Oberreiter, Birgit Eckers, Franziska Bühler, Dominik Gascho, Dominic Müller, Andreas M. Mündermann, Annegret Baumgartner, Daniel
et. al:	No
DOI:	10.1016/j.jbiomech.2024.112055
Published in:	Journal of Biomechanics
Issue:	112055
Issue Date:	2024
Publisher / Ed. Institution:	Elsevier
ISSN:	0021-9290 1873-2380
Language:	English
Subjects:	Shoulder; Biomechanics; Simulation; Glenohumeral simulator; Muscle force; Rotator cuff tear; Cadaver; Scaption
Subject (DDC):	610: Medicine and health 620: Engineering
Abstract:	Glenohumeral biomechanics after rotator cuff (RC) tears have not been fully elucidated. This study aimed to investigate the muscle compensatory mechanism in weight-bearing shoulders with RC tears and asses the induced pathomechanics (i.e., glenohumeral translation, joint instability, center of force (CoF), joint reaction force). An experimental, glenohumeral simulator with muscle-mimicking cable system was used to simulate 30° scaption motion. Eight fresh-frozen shoulders were prepared and mounted in the simulator. Specimen-specific scapular anthropometry was used to test six RC tear types, with intact RC serving as the control, and three weight-bearing loads, with the non-weight-bearing condition serving as the control. Glenohumeral translation was calculated using instantaneous helical axis. CoF, muscle forces, and joint reaction forces were measured using force sensors integrated into the simulator. Linear mixed effects models (RC tear type and weight-bearing) with random effects (specimen and sex) were used to assess differences in glenohumeral biomechanics. RC tears did not change the glenohumeral translation (p > 0.05) but shifted the CoF superiorly (p ≤ 0.005). Glenohumeral translation and joint reaction forces increased with increasing weight bearing (p < 0.001). RC and deltoid muscle forces increased with the presence of RC tears (p ≤ 0.046) and increased weight bearing (p ≤ 0.042). The synergistic muscles compensated for the torn RC tendons, and the glenohumeral translation remained comparable to that for the intact RC tendons. However, in RC tears, the more superior CoF was close to where glenoid erosion occurs in RC tear patients with secondary osteoarthritis. These findings underscore the importance of early detection and precise management of RC tears.
URI:	https://digitalcollection.zhaw.ch/handle/11475/30356
Fulltext version:	Published version
License (according to publishing contract):	CC BY 4.0: Attribution 4.0 International
Departement:	School of Engineering
Organisational Unit:	Institute of Mechanical Systems (IMES)
Appears in collections:	Publikationen School of Engineering

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Genter, J., Croci, E., Oberreiter, B., Eckers, F., Bühler, D., Gascho, D., Müller, A. M., Mündermann, A., & Baumgartner, D. (2024). The influence of rotator cuff tear type and weight bearing on shoulder biomechanics in an ex vivo simulator experiment. Journal of Biomechanics, 112055. https://doi.org/10.1016/j.jbiomech.2024.112055

Genter, J. et al. (2024) ‘The influence of rotator cuff tear type and weight bearing on shoulder biomechanics in an ex vivo simulator experiment’, Journal of Biomechanics [Preprint], (112055). Available at: https://doi.org/10.1016/j.jbiomech.2024.112055.

J. Genter et al., “The influence of rotator cuff tear type and weight bearing on shoulder biomechanics in an ex vivo simulator experiment,” Journal of Biomechanics, no. 112055, 2024, doi: 10.1016/j.jbiomech.2024.112055.

GENTER, Jeremy, Eleonora CROCI, Birgit OBERREITER, Franziska ECKERS, Dominik BÜHLER, Dominic GASCHO, Andreas M. MÜLLER, Annegret MÜNDERMANN und Daniel BAUMGARTNER, 2024. The influence of rotator cuff tear type and weight bearing on shoulder biomechanics in an ex vivo simulator experiment. Journal of Biomechanics. 2024. Nr. 112055. DOI 10.1016/j.jbiomech.2024.112055

Genter, Jeremy, Eleonora Croci, Birgit Oberreiter, Franziska Eckers, Dominik Bühler, Dominic Gascho, Andreas M. Müller, Annegret Mündermann, and Daniel Baumgartner. 2024. “The Influence of Rotator Cuff Tear Type and Weight Bearing on Shoulder Biomechanics in an Ex Vivo Simulator Experiment.” Journal of Biomechanics, no. 112055. https://doi.org/10.1016/j.jbiomech.2024.112055.

Genter, Jeremy, et al. “The Influence of Rotator Cuff Tear Type and Weight Bearing on Shoulder Biomechanics in an Ex Vivo Simulator Experiment.” Journal of Biomechanics, no. 112055, 2024, https://doi.org/10.1016/j.jbiomech.2024.112055.