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

Autor: Genter J; IMES Institute of Mechanical Systems, Zurich University of Applied Sciences ZHAW, Winterthur, Switzerland; Department of Biomedical Engineering, University of Basel, Basel, Switzerland; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland. Electronic address: gent@zhaw.ch., Croci E; Department of Biomedical Engineering, University of Basel, Basel, Switzerland; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland., Oberreiter B; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland., Eckers F; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland., Bühler D; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland., Gascho D; Department of Forensic Medicine and Imaging, Institute of Forensic Medicine, University of Zurich, Zurich, Switzerland., Müller AM; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland., Mündermann A; Department of Biomedical Engineering, University of Basel, Basel, Switzerland; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland; Department of Clinical Research, University of Basel, Basel, Switzerland., Baumgartner D; IMES Institute of Mechanical Systems, Zurich University of Applied Sciences ZHAW, Winterthur, Switzerland.
Jazyk: angličtina
Zdroj: Journal of biomechanics [J Biomech] 2024 Mar; Vol. 166, pp. 112055. Date of Electronic Publication: 2024 Mar 20.
DOI: 10.1016/j.jbiomech.2024.112055
Abstrakt: 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.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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