Muscles Functioning as Primary Shoulder Movers Aid the Rotator Cuff Muscles in Increasing Active Glenohumeral Stiffness

被引：0

作者：

Constantine P. Nicolozakes ^{[1
]}

Julia S. Schmulewitz ^{[2
]}

Daniel Ludvig ^{[3
]}

Emma M. Baillargeon ^{[6
]}

Margaret S. Danziger ^{[1
]}

Amee L. Seitz ^{[1
]}

Eric J. Perreault ^{[2
]}

机构：

[1] Department of Biomedical Engineering, Northwestern University, Evanston, IL

[2] Shirley Ryan AbilityLab, Chicago, IL

[3] Feinberg School of Medicine, Northwestern University, Chicago, IL

[4] Division of Geriatric Medicine, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA

[5] Department of Physical Therapy & Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL

[6] Department of Physical Medicine & Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL

来源：

Annals of Biomedical Engineering | 2025年 / 53卷 / 6期

基金：

美国国家卫生研究院;

关键词：

Dislocation; Electromyography; Instability; Joint stiffness; Rotator cuff; Shoulder;

D O I：

10.1007/s10439-025-03683-5

中图分类号：

学科分类号：

摘要：

Purpose: Active stability is essential to preventing dislocations and the focus of rehabilitation following dislocations. This is thought to arise from shoulder muscles compressing the humeral head into the glenoid (called concavity compression). However, shoulder muscles may also resist humeral head translation through increases in intrinsic muscle stiffness, an unexplored mechanism. Our objective was to quantify shoulder muscles’ contributions to changes in glenohumeral stiffness, or the resistance to humeral head translation. We hypothesized that primary shoulder movers (e.g., the pectoralis major or deltoid) would differ from rotator cuff muscles in how much they increase glenohumeral stiffness because they leverage their intrinsic stiffness in addition to concavity compression. Methods: We measured glenohumeral stiffness across a range of isometric muscle activation levels in shoulder abduction and used electromyography to estimate the contributions of rotator cuff muscles and primary shoulder movers. We then created a musculoskeletal model to evaluate individual muscle contributions to glenohumeral stiffness through both concavity compression and intrinsic muscle stiffness. Results: We found that muscle activity in primary shoulder movers was a better predictor of active glenohumeral stiffness than in rotator cuff muscles (R2 = 0.81 vs 0.36, P < 0.001). Our musculoskeletal model demonstrated that concavity compression is the primary stabilizing mechanism for most shoulder muscles, yet the muscles that increase glenohumeral stiffness the most also do so considerably through their intrinsic muscle stiffness. Conclusion: Our results emphasize the importance of primary shoulder movers as active stabilizers of the glenohumeral joint and highlight their potential importance in preventing shoulder dislocations. © The Author(s) under exclusive licence to Biomedical Engineering Society 2025.

引用

页码：1328 / 1343

页数：15

共 56 条

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