An integrated model of active glenohumeral stability

Favre, Philippe; Senteler, Marco; Hipp, Jasmin; Scherrer, Simon; Gerber, Christian; Snedeker, Jess G.

doi:10.1016/j.jbiomech.2012.06.010

Cited by 58 publications

(62 citation statements)

References 79 publications

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“…This was related to the fact that loaded edges represent stress concentration points and lead to singularities in the finite element mesh where the elastic strains and stresses are theoretically infinite. However, the evolution and the final volume of the process zone was independent from the finite element mesh as soon as the be less than half (van der Helm 1994) or more than twice as high (Favre et al 2012) as the results reported in this study. In either case, using optimization-based muscle force estimation risks underestimating the supraspinatus force since optimization-based methods tend to underestimate stabilizing muscle activity (Engelhardt et al 2015).…”

Section: Discussionsupporting

confidence: 58%

Effect of partial-thickness tear on loading capacities of the supraspinatus tendon: a finite element analysis

Engelhardt

Ingram²,

Müllhaupt³

et al. 2015

Computer Methods in Biomechanics and Biomedical Engineering

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Partial-thickness tears of the supraspinatus tendon frequently occur at its insertion on the greater tubercule of the humerus, causing pain and reduced strength and range of motion. The goal of this work was to quantify the loss of loading capacity due to tendon tears at the insertion area. A finite element model of the supraspinatus tendon was developed using in vivo magnetic resonance images data. The tendon was represented by an anisotropic hyperelastic constitutive law identified with experimental measurements. A failure criterion was proposed and calibrated with experimental data. A partial-thickness tear was gradually increased, starting from the deep articular-sided fibres.For different values of tendon tear thickness, the tendon was mechanically loaded up to failure. The numerical model predicted a loss in loading capacity of the tendon as the tear thickness progressed. Tendon failure was more likely when the tendon tear exceeded 20%. The predictions of the model were consistent with experimental studies. Partial-thickness tears below 40% tear are sufficiently stable to persist physiotherapeutic exercises. Above 60% tear surgery should be considered to restore shoulder strength.

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Section: Discussionsupporting

confidence: 58%

Effect of partial-thickness tear on loading capacities of the supraspinatus tendon: a finite element analysis

Engelhardt

Ingram²,

Müllhaupt³

et al. 2015

Computer Methods in Biomechanics and Biomedical Engineering

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“…Conversely, our results showed different force patterns for the rotator cuff and deltoid muscles compared with the study of Yanagawa et al (2008): infraspinatus and supraspinatus showed almost constant forces during the movement while our stress-based model predicted a maximum at 708 of abduction. Another study calculated muscle forces for glenohumeral abduction up to 808 glenohumeral elevation (Favre et al 2012). Rotator cuff activity was higher compared with our stress-based method.…”

Section: Discussionmentioning

confidence: 95%

“…In this position, the torque produced by the arm weight is maximal. The only other musculoskeletal model that considered humeral head translation (Favre et al 2012) uncoupled humeral head translation from muscle force estimation. Although this model did not continuously update the muscle moment arms associated to humeral head translation, it predicted an upward migration of the humeral head followed by a descent in the second half of the abduction movement.…”

Section: Discussionmentioning

confidence: 99%

Comparison of an EMG-based and a stress-based method to predict shoulder muscle forces

Engelhardt

Camine

Ingram

et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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The estimation of muscle forces in musculoskeletal shoulder models is still controversial. Two different methods are widely used to solve the indeterminacy of the system: electromyography (EMG)-based methods and stress-based methods. The goal of this work was to evaluate the influence of these two methods on the prediction of muscle forces, glenohumeral load and joint stability after total shoulder arthroplasty. An EMG-based and a stress-based method were implemented into the same musculoskeletal shoulder model. The model replicated the glenohumeral joint after total shoulder arthroplasty. It contained the scapula, the humerus, the joint prosthesis, the rotator cuff muscles supraspinatus, subscapularis and infraspinatus and the middle, anterior and posterior deltoid muscles. A movement of abduction was simulated in the plane of the scapula. The EMG-based method replicated muscular activity of experimentally measured EMG. The stress-based method minimised a cost function based on muscle stresses. We compared muscle forces, joint reaction force, articular contact pressure and translation of the humeral head. The stress-based method predicted a lower force of the rotator cuff muscles. This was partly counter-balanced by a higher force of the middle part of the deltoid muscle. As a consequence, the stress-based method predicted a lower joint load (16% reduced) and a higher superior -inferior translation of the humeral head (increased by 1.2 mm). The EMG-based method has the advantage of replicating the observed cocontraction of stabilising muscles of the rotator cuff. This method is, however, limited to available EMG measurements. The stress-based method has thus an advantage of flexibility, but may overestimate glenohumeral subluxation.

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“…whether their stability ratios were affected by the amount of humeral elevation and plane of elevation, a multi-factorial repeated-measures ANOVA was carried out using the stability ratios as dependent variable for the supraspinatus, infraspinatus, subscapularis, middle deltoid, pectoralis major and latissimus dorsi muscles. Within-subjects factors were the humeral elevation, with 6 levels between • spaced at 15 and from literature data [38], [41], [21], [22] as a function of humeral elevation during abduction.…”

Section: G Statisticsmentioning

confidence: 99%

“…Additionally electromyographic studies have examined phasic activity of the shoulder muscles [11], [12] but cannot shed light on the changes in stability ratio during a movement. Musculoskeletal models, on the other hand, allow investigating movements in vivo while taking muscle activity into account [19], [20], [21]. In this way it has been shown that supraspinatus, infraspinatus and subscapularis contributed little to the glenohumeral abduction torque and presented low stability ratios during humeral abduction in the scapular plane [22].…”

Section: Introductionmentioning

confidence: 99%

The Stabilizing Function of Superficial Shoulder Muscles Changes Between Single-Plane Elevation and Reaching Tasks

Ameln

Chadwick

Blana

et al. 2019

IEEE Trans. Biomed. Eng.

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Abstract-Objective:The goal of the current study was to determine whether and how much the stabilizing role of the shoulder muscles changes as a function of humeral elevation and the plane of elevation. Methods: A musculoskeletal model, comprising a personalized scapulohumeral rhythm, was used to calculate the ratio of shear over compressive force (stability ratio) of three rotator cuff muscles (supraspinatus, infraspinatus, subscapularis) and three superficial shoulder muscles (middle deltoid, clavicular part of pectoralis major, latissimus dorsi) during abduction, flexion and reaching movements in ten healthy adults. Results: The range of the stability ratios was [±0.5] for the rotator cuff muscles compared to [+5, −2] for the superficial shoulder muscles. In the superior-inferior direction, the stability ratios of all muscles changed with humeral elevation and for infraspinatus, subscapularis, latissimus dorsi and deltoid also with the plane of elevation. In the anterior-posterior direction, the stability ratios of all muscles changed with humeral elevation, except for the deltoid, and with the plane of elevation, except for the supraspinatus, with interaction effects in all muscles. Conclusion: The rotator cuff muscles provide greater compression than shear forces during all tasks. The stabilizing function of the superficial shoulder muscles examined in this study varies during tasks. Significance: The findings can be used to predict in which movements the shoulder joint becomes more unstable and can be applied to understand how shear and compressive forces change in populations with abnormal shoulder motion.

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An integrated model of active glenohumeral stability

Cited by 58 publications

References 79 publications

Effect of partial-thickness tear on loading capacities of the supraspinatus tendon: a finite element analysis

Effect of partial-thickness tear on loading capacities of the supraspinatus tendon: a finite element analysis

Comparison of an EMG-based and a stress-based method to predict shoulder muscle forces

The Stabilizing Function of Superficial Shoulder Muscles Changes Between Single-Plane Elevation and Reaching Tasks

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