Towards a model for force predictions in the human shoulder

Karlsson, Dan; Peterson, Bo

doi:10.1016/0021-9290(92)90275-6

Cited by 248 publications

(126 citation statements)

References 17 publications

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“…Muscular forces as well as total contact forces calculated with the model were low compared to values found in the literature [4,6,7,33]. The difference may be explained by the different motions considered.…”

Section: Discussioncontrasting

confidence: 60%

“…Contact pressure on the glenoid fossa during internal and external rotations for normal (top) and OA (bottom) shoulders. laws of mechanics [4][5][6][7] or with (ii) deformable body systems [8][9][10][11][12][13][14]. Rigid body models provide useful but coarse approximation of the joint interface behavior.…”

Section: Discussionmentioning

confidence: 99%

“…Numerous models of the human shoulder have been proposed. The first models were based on the inverse dynamic theories [4][5][6][7] and were used to determine the muscular forces. Models based on the deformable body concept [8][9][10][11][12] were then proposed and used to calculate stress distribution within individual bones of the joint.…”

Section: Introductionmentioning

confidence: 99%

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A finite element model of the shoulder: application to the comparison of normal and osteoarthritic joints

Büchler

Ramaniraka

Rakotomanana

et al. 2002

Clinical Biomechanics

137

101

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Objective. The objective of the present study was to develop a numerical model of the shoulder able to quantify the influence of the shape of the humeral head on the stress distribution in the scapula. The subsequent objective was to apply the model to the comparison of the biomechanics of a normal shoulder (free of pathologies) and an osteoarthritic shoulder presenting primary degenerative disease that changes its bone shape.Design. Since the stability of the glenohumeral joint is mainly provided by soft tissues, the model includes the major rotator cuff muscles in addition to the bones.Background. No existing numerical model of the shoulder is able to determine the modification of the stress distribution in the scapula due to a change of the shape of the humeral head or to a modification of the glenoid contact shape and orientation.Methods. The finite element method was used. The model includes the three-dimensional computed tomography-reconstructed bone geometry and three-dimensional rotator cuff muscles. Large sliding contacts between the reconstructed muscles and the bone surfaces, which provide the joint stability, were considered. A non-homogenous constitutive law was used for the bone as well as non-linear hyperelastic laws for the muscles and for the cartilage. Muscles were considered as passive structures. Internal and external rotations of the shoulders were achieved by a displacement of the muscle active during the specific rotation (subscapularis for internal and infrapinatus for external rotation).Results. The numerical model proposed is able to describe the biomechanics of the shoulder during rotations. The comparison of normal vs. osteoarthritic joints showed a posterior subluxation of the humeral head during external rotation for the osteoarthritic shoulder but no subluxation for the normal shoulder. This leads to important von Mises stress in the posterior part of the glenoid region of the pathologic shoulder while the stress distribution in the normal shoulder is fairly homogeneous.Conclusion. This study shows that the posterior subluxation observed in clinical situations for osteoarthritic shoulders may also be cause by the altered geometry of the pathological shoulder and not only by a rigidification of the subscapularis muscle as often postulated. This result is only possible with a model including the soft tissues provided stability of the shoulder. RelevanceOne possible cause of the glenoid loosening is the eccentric loading of the glenoid component due to the translation of the humeral head. The proposed model would be a useful tool for designing new shapes for a humeral head prosthesis that optimizes the glenoid loading, the bone stress around the implant, and the bone/implant micromotions in a way that limits the risks of loosening.

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Section: Discussioncontrasting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

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A finite element model of the shoulder: application to the comparison of normal and osteoarthritic joints

Büchler

Ramaniraka

Rakotomanana

et al. 2002

Clinical Biomechanics

137

101

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show abstract

“…[1,[3][4][5], assume that the glenohumeral joint is a ball-socket joint. By this simplification, the amplitude and location of the joint contact force can be easily estimated, but the natural translations are forbidden and the resulting glenoid stress might be underestimated.…”

Section: Introductionmentioning

confidence: 99%

An algorithm to allow humerus translation in the indeterminate problem of shoulder abduction

Terrier

Vogel

Capezzali

et al. 2008

Medical Engineering & Physics

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The shoulder is one of the most complex joints of the human body, mainly because of its large range of motion, but also because of its active muscular stabilisation. Actually, the numerous stabilizing muscles and degrees of freedom yield indeterminate biomechanical models. To solve this indeterminate, most models use reverse dynamics with a simplified ball-socket joint, preventing therefore the natural humerus translation. In this paper, an algorithm was specifically developed to solve the indeterminate problem by a feedback control of muscle activation, allowing the natural humerus translation. Abduction was considered in the scapular plane, accounting for the three deltoid parts and the rotator cuff muscles. The major aim of this study was to validate the numerical algorithm, which was here restricted to two-dimensions in order to compare the numerical solution to a known algebraic one. This comparison gave a relative error below 0.1%. The joint reaction force was comparable to other models and the humerus translation was in agreement with in vivo or in vitro studies.

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“…The magnitude of the load applied to the joint was not representative of the forces acting in vivo. 3,9,21,33,39 Because the in vivo forces causing dislocation of the reverse prosthesis remain unknown 17 this force was selected to reproduce the standards implemented in previous studies, 18,26,31,38 and was chosen low enough to avoid deformation of the polyethylene cup. 1,11 Furthermore, it has been shown that there exist a linear relationship between the compressive and the dislocation force, 17 indicating that the stability ratio is independent of the compressive load in the reverse setting.…”

Section: Discussionmentioning

confidence: 99%

The effect of component positioning on intrinsic stability of the reverse shoulder arthroplasty

Favre

Sussmann

Gerber

2010

Journal of Shoulder and Elbow Surgery

142

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Towards a model for force predictions in the human shoulder

Cited by 248 publications

References 17 publications

A finite element model of the shoulder: application to the comparison of normal and osteoarthritic joints

A finite element model of the shoulder: application to the comparison of normal and osteoarthritic joints

An algorithm to allow humerus translation in the indeterminate problem of shoulder abduction

The effect of component positioning on intrinsic stability of the reverse shoulder arthroplasty

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