Total shoulder and relative muscle strength in the scapular plane

Makhsous, Mohsen; Högfors, Christian; Siemienski, Adam; Peterson, Bo

doi:10.1016/s0021-9290(99)00049-4

Cited by 19 publications

(9 citation statements)

References 8 publications

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“…Current models of the glenohumeral joint have been used to make muscle force predictions for other motions. 28,53,76 In the future it would be interesting to conduct an experiment to obtain in vivo data for estimating muscle forces during external rotation as has been done for other joints and other motions.…”

Section: Discussionmentioning

confidence: 99%

A Probabilistic Model of Glenohumeral External Rotation Strength for Healthy Normals and Rotator Cuff Tear Cases

et al. 2006

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The reigning paradigm of musculoskeletal modeling is to construct deterministic models from parameters of an "average" subject and make predictions for muscle forces and joint torques with this model. This approach is limited because it does not perform well for outliers, and it does not model the effects of population parameter variability. The purpose of this study was to simulate variability in musculoskeletal parameters on glenohumeral external rotation strength in healthy normals, and in rotator cuff tear cases using a Monte Carlo model. The goal was to determine if variability in musculoskeletal parameters could quantifiably explain variability in glenohumeral external rotation strength. Multivariate Gamma distributions for musculoskeletal architecture and moment arm were constructed from empirical data. Gamma distributions of measured joint strength were constructed. Parameters were sampled from the distributions and input to the model to predict muscle forces and joint torques. The model predicted measured joint torques for healthy normals, subjects with supraspinatus tears, and subjects with infraspinatus-supraspinatus tears with small error. Muscle forces for the three conditions were predicted and compared. Variability in measured torques can be explained by differences in parameter variability.

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Section: Discussionmentioning

confidence: 99%

A Probabilistic Model of Glenohumeral External Rotation Strength for Healthy Normals and Rotator Cuff Tear Cases

et al. 2006

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“…Such models should be complex enough to realistically replicate the behavior of the human musculoskeletal system. Few complex upper extremity models have been developed such as the Swedish model [10, 11] based on the model of Hogfors et al [12, 13], the Newcastle shoulder model [14], the shoulder part of the AnyBody Modeling System [6], the Stanford model implemented in SIMM [15], and the Delft Shoulder Model (DSM) which is the core of this study.…”

Section: Introductionmentioning

confidence: 99%

Development of a comprehensive musculoskeletal model of the shoulder and elbow

Nikooyan

Veeger

Chadwick

et al. 2011

Med Biol Eng Comput

122

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The Delft Shoulder and Elbow Model (DSEM), a musculoskeletal model of the shoulder and elbow has been extensively developed since its introduction in 1994. Extensions cover both model structures and anatomical data focusing on the addition of an elbow part and muscle architecture parameters. The model was also extended with a new inverse-dynamics optimization cost function and combined inverse-forward-dynamics models. This study is an update on the developments of the model over the last decade including a qualitative validation of the different simulation architectures available in the DSEM. To validate the model, a dynamic forward flexion motion was performed by one subject, of which the motion data and surface EMG-signals of 12 superficial muscles were measured. Patterns of the model-predicted relative muscle forces were compared with their normalized EMG-signals. Results showed relatively good agreement between forces and EMG (mean correlation coefficient of 0.66). However, for some cases, no force was predicted while EMG activity had been measured (false-negatives). The DSEM has been used and has the potential to be used in a variety of clinical and biomechanical applications.Electronic supplementary materialThe online version of this article (doi:10.1007/s11517-011-0839-7) contains supplementary material, which is available to authorized users.

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“…As mentioned in Section 3, it is believed that the conrobustness-were encouraging although not perfect [5,[21][22][23][24][25]. Discrepancies were due to variations among tact forces for subject 5, sitting down, were overestimated.…”

Section: Introductionmentioning

confidence: 99%

Glenohumeral contact forces

Anglin

Wyss

Pichora

2000

Proc Inst Mech Eng H

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Glenohumeral contact forces have only been calculated previously either for simple abduction or for athletic activities. The objective of this study was to determine the glenohumeral contact forces for tasks which are demanding of the shoulder but which would commonly be performed by older people. The functional tasks chosen were using the arms to stand up from and sit down into a chair, walking with a cane, lifting a 5 kg box to shoulder height with both hands, and lifting a 10 kg suitcase. The trunk angles, arm angles and hand loads of six healthy subjects, average age 55 years, were recorded. This information was input into a biomechanical computer model which optimized the muscle force distribution by minimizing the sum of squared muscle stresses subject to constraints on the maximum muscle forces and maintaining the direction of the resultant force within the glenoid fossa. Average contact forces ranged from 1.3 to 2.4 times body weight (930-1720 N), the highest force being for lifting a suitcase. This latter value would be even higher if lifting either a greater load or to a greater height. Thus, contact forces at the shoulder should not be underestimated. This study provides functionally relevant contact forces which can be used for mechanical testing or finite element modelling of shoulder prostheses.

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Total shoulder and relative muscle strength in the scapular plane

Cited by 19 publications

References 8 publications

A Probabilistic Model of Glenohumeral External Rotation Strength for Healthy Normals and Rotator Cuff Tear Cases

A Probabilistic Model of Glenohumeral External Rotation Strength for Healthy Normals and Rotator Cuff Tear Cases

Development of a comprehensive musculoskeletal model of the shoulder and elbow

Glenohumeral contact forces

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