Contributions of the Individual Muscles of the Shoulder to Glenohumeral Joint Stability During Abduction

Yanagawa, Takashi; Goodwin, Cheryl J.; Shelburne, Kevin B.; Giphart, J. Erik; Torry, Michael R.; Pandy, Marcus G.

doi:10.1115/1.2903422

Cited by 120 publications

(97 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The middle deltoid force, for example, was half as big as in our model (van der Helm 1994). 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).…”

Section: Discussioncontrasting

confidence: 85%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Discussioncontrasting

confidence: 85%

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

View full text Add to dashboard Cite

show abstract

“…More recently, the Newcastle model was used to evaluate the shoulder biomechanics in several activities of daily living and provided similar results as the Dutch model [8]. Another similar model predicted glenohumeral reaction force of about 70% of the BW during quasi-static abduction in the scapular plane [9]. Other optimization models have been developed for posture control or ergonomics analyses [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A musculoskeletal shoulder model based on pseudo-inverse and null-space optimization

Terrier

Aeberhard

Michellod

et al. 2010

Medical Engineering & Physics

View full text Add to dashboard Cite

ARTICLE IN PRESSThe goal of the present work was assess the feasibility of using a pseudo-inverse and null-space optimization approach in the modeling of the shoulder biomechanics. The method was applied to a simplified musculoskeletal shoulder model. The mechanical system consisted in the arm, and the external forces were the arm weight, 6 scapulo-humeral muscles and the reaction at the glenohumeral joint, which was considered as a spherical joint. The muscle wrapping was considered around the humeral head assumed spherical. The dynamical equations were solved in a Lagrangian approach. The mathematical redundancy of the mechanical system was solved in two steps: a pseudo-inverse optimization to minimize the square of the muscle stress and a null-space optimization to restrict the muscle force to physiological limits. Several movements were simulated. The mathematical and numerical aspects of the constrained redundancy problem were efficiently solved by the proposed method. The prediction of muscle moment arms was consistent with cadaveric measurements and the joint reaction force was consistent with in vivo measurements.This preliminary work demonstrated that the developed algorithm has a great potential for more complex musculoskeletal modeling of the shoulder joint. In particular it could be further applied to a non-spherical joint model, allowing for the natural translation of the humeral head in the glenoid fossa.

show abstract

“…Coordinated synchronous activity of shoulder girdle muscles is required to limit translation of the humeral head on the shallow glenoid fossa [Bey et al, 2008;Poppen et al, 1978]. Rotator cuff muscle activity plays a fundamental role in maintaining glenohumeral joint (GHJ) stability [Burkhart, 1991;Inman et al, 1996;Yanagawa et al, 2008], 'stiffening' the GHJ to establish a stable fulcrum [David et al, 2000].…”

Section: Introductionmentioning

confidence: 99%

Electromyographic assessment of muscle fatigue in massive rotator cuff tear

Hawkes

Alizadehkhaiyat

Kemp

et al. 2015

Journal of Electromyography and Kinesiology

View full text Add to dashboard Cite

Shoulder muscle fatigue has not been assessed in massive rotator cuff tear (MRCT). This study used EMG to measure fatigability of 13 shoulder muscles in 14 healthy controls and 11 patients with MRCT. A hand grip protocol was applied to minimise artifacts due to pain experience during measurement. The fatigue index (median frequency slope) was significantly non-zero (negative) for anterior, middle, and posterior parts of deltoid, supraspinatus and subscapularis muscles in the controls, and for anterior, middle, and posterior parts of deltoid, and pectoralis major in patients (p ≤ 0.001). Fatigue was significantly greater in patients compared to the controls for anterior and middle parts of deltoid and pectoralis major (p ≤ 0.001). A submaximal grip task provided a feasible way to assess shoulder muscle fatigue in MRCT patients, however with some limitations. The results suggest increased activation of deltoid is required to compensate for lost supraspinatus abduction torque. Increased pectoralis major fatigue in patients (adduction torque) likely reflected strategy to stabilise the humeral head against superior subluxing force of the deltoid. Considering physiotherapy as a primary or adjunct intervention for the management of MRCT, the findings of this study generate a base for future clinical studies aiming at the development of evidence-based protocol

show abstract

Contributions of the Individual Muscles of the Shoulder to Glenohumeral Joint Stability During Abduction

Cited by 120 publications

References 33 publications

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

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

A musculoskeletal shoulder model based on pseudo-inverse and null-space optimization

Electromyographic assessment of muscle fatigue in massive rotator cuff tear

Contact Info

Product

Resources

About